BentoUtils - Free Online File Converter & Utility Tools

One tidy bento box,
255+ tiny tools.

Calculators and converters for makers, brewers, electricians, climbers, photographers, and more. Pick a compartment, get your answer, and get on with your day - everything runs on your device, and nothing is ever uploaded.

- tools, zero sign-up
nothing's ever uploaded
100% free, no limits

Available tools

1RM & Strength Standards - Calculate your one-rep max from any set, compare to strength standards, get your Wilks and DOTS score, and plan your training weights. Nothing uploaded.

SRT Subtitle Timing Adjuster - Free SRT subtitle timing adjuster. Shift all timestamps by a fixed offset or fix frame-rate drift. Timeline preview, before/after comparison, instant download. Nothing uploaded.

FIT File Parser & Viewer - Free online FIT file parser for Garmin, Wahoo, and Polar activities. GPS route map, elevation and HR charts, full data table, CSV export. Nothing uploaded, no account needed.

SVG to DXF Converter - Free online SVG to DXF converter for Glowforge, xTool, Atomstack, and CNC routers. Live vector preview, scale to exact millimetres. No Inkscape, nothing uploaded.

HEIC to PDF Compressor - Free HEIC to PDF converter. Batch up to 50 Apple HEIC photos into a single optimised PDF. Adjustable quality, optional metadata stripping. Nothing uploaded.

EXIF Bulk Stripper - Free bulk EXIF metadata stripper. Remove GPS location, serial numbers, and timestamps from up to 50 photos - download clean versions. Before/after map. Nothing uploaded.

KML to GeoJSON Converter - Free online KML to GeoJSON converter. Convert Google Maps saved places, Google Earth KML/KMZ exports with live map preview and copy to clipboard. Nothing uploaded.

GPX to CSV Extractor - Free online GPX to CSV extractor. Convert GPS tracks and waypoints into analysis-ready spreadsheets. Preserves elevation, timestamps, and heart rate. Nothing uploaded.

BibTeX to Citation Converter - Free BibTeX to citation converter. Paste from Google Scholar and get APA 7th, MLA 9th, Chicago, Vancouver, IEEE, Harvard, and Nature citations instantly. 8 styles, no signup.

Freelance Rate Calculator - Free freelance hourly rate calculator. Enter take-home target, country, and overhead to get minimum, recommended, and stretch rates. Day rate and monthly retainer included. No signup.

Markdown to PDF Converter - Free Markdown to PDF converter. Paste or upload .md files, pick a theme, and print to clean PDF. Syntax highlighting, tables, task lists, no watermark, no upload, no account.

EPUB Metadata Editor - Free online EPUB metadata editor - no Calibre needed. Fix title, author, ISBN, cover, and description in your browser. KDP readiness checklist, live e-reader mockup. Nothing uploaded.

EPS to DST Converter - Free online EPS to DST embroidery converter. Convert vector EPS artwork into Tajima DST stitch files with automatic path tracing and density control. No software install.

EU VAT Calculator - Free EU VAT calculator by country 2025. Enter net or gross price, pick buyer's country, get correct VAT rate and invoice total. B2B reverse charge. All 27 EU member states. No signup.

Resistor Color Code - Free interactive resistor color code calculator. Click bands to decode resistance or type a value to get band colors. 4, 5, and 6-band support, E-series match, BOM builder. No signup.

Coffee Brew Ratio Calculator - Free coffee brew ratio calculator. V60, AeroPress, Chemex, French Press, Clever Dripper. Step-by-step pour schedule, live brew timer with audio cues, strength indicator, save recipes. No signup.

Homebrewer's Recipe Calculator - Free homebrew recipe calculator. Enter grain bill and hop schedule to get OG, FG, ABV%, IBU, SRM beer color. BJCP style match against 22 styles, grain donut chart, hop timeline. No signup.

PCR Primer Tm Calculator - Free PCR primer Tm calculator. Nearest-neighbor thermodynamics (SantaLucia 1998), Wallace rule, salt correction, DMSO adjustment. GC%, hairpin detection, dimer risk, primer pair analysis. No signup.

Race Pace Split Calculator - Free race pace split calculator for runners and triathletes. Plan 5K to 100K with even, negative, or positive strategies. Per-km or per-mile splits, pace chart, effort levels, print wristband. Nothing uploaded.

CSV Quick Chart Generator - Drop a CSV, pick columns, see a chart instantly. Bar, line, scatter, pie, area, histogram - trendlines, multi-series, outlier detection, color grouping. Download PNG. Zero data leaves your browser.

Unix Timestamp Converter - Free Unix timestamp converter. Auto-detects seconds, milliseconds, or microseconds. Bidirectional: type a timestamp or a date. ISO 8601, RFC 2822, relative time, batch convert. No signup.

Image Color Palette - Free image color palette extractor. Drop any photo to get dominant colors as hex codes using k-means clustering - entirely in your browser. Copy as CSS variables, SCSS, or Tailwind config. Nothing uploaded.

Yarn Yardage Calculator - Free yarn yardage calculator for knitters and crocheters. Enter pattern yardage and yarn ball length to get balls needed. Size scaling table, stash checker, cost estimate. No signup.

Ham Radio Antenna Calculator - Free ham radio antenna length calculator. Dipole, quarter-wave vertical, 5/8-wave vertical, and Yagi antennas. Enter frequency in MHz, get cut lengths in mm, cm, feet, and inches. No signup.

PDF Page Range Splitter - Extract specific pages or page ranges from any PDF entirely in your browser. Thumbnail grid, drag-to-select, multiple named output files, download as ZIP. No upload, no watermark.

Quilting Fabric Cut Calculator - Free quilting fabric cut calculator. Enter cut size, fabric width, and pieces needed to get exact yardage, a live cutting layout diagram, and a shopping card for the fabric store. Nothing uploaded.

Screenwriting Script Timer - Free screenplay runtime calculator. Paste a .fountain or plain-text script to estimate runtime, act-by-act breakdown, scene histogram, and structure feedback. Nothing uploaded.

M3U Playlist Cleaner & Exporter - Upload your IPTV or music M3U playlist, remove duplicates, rename channels, filter by group, and export a clean file. Nothing uploaded.

IPTC Photo Metadata Editor - Drop JPEGs, fill in caption, credit, and copyright fields, then download with IPTC metadata embedded. Batch apply across all photos. Nothing uploaded.

Chord Transposer & Capo Calculator - Paste a chord chart, pick your target key or capo position, and get the transposed chart instantly - chords above the right syllables. Nothing uploaded.

BPM Tap Tempo & Key Analyzer - Tap spacebar to measure BPM with live averaging and a pulse metronome. Enter your track's key to see compatible keys on the Camelot Wheel for harmonic mixing. Nothing uploaded.

Climbing Grade Converter - Convert between YDS, French, UIAA, Ewbank, V-scale, and Font climbing grades. Visual grade ladder and difficulty percentile. Works offline. Nothing uploaded.

CMYK to Pantone Approximator - Find the nearest Pantone Solid Coated color from CMYK, HEX, RGB, or LAB input using Delta-E color distance. Top 3 matches, copy PMS code. Nothing uploaded.

STL File Viewer & Dimension Inspector - Drop an STL file to see bounding box dimensions, volume, and surface area in a live WebGL 3D viewer. Drag to rotate, scroll to zoom. Nothing uploaded.

G-code Previewer & Layer Inspector - Drop a G-code file and scrub through it layer by layer. Color-coded by feature type with print time and filament estimates. Nothing uploaded.

PCB Trace Width Calculator - Calculate minimum PCB trace width per IPC-2221. External and internal layers, resistance, voltage drop, via current capacity, and multi-trace BOM table. Nothing uploaded.

Ohm's Law & Power Triangle Calculator - Enter any two of V, I, R, P and get all four values instantly with formulas shown. Smart unit prefixes, power rating, series/parallel resistor calculator. Nothing uploaded.

Tile & Flooring Coverage Calculator - Free tile and flooring coverage calculator. Enter room dimensions and tile size to get exact tile count, boxes needed, and cost estimate with a live cutting layout diagram. Nothing uploaded.

Cron Expression Builder - Free visual cron expression builder and explainer. Type a cron schedule or use the visual builder to get plain English translation and next 5 run times. Nothing uploaded.

Color Contrast Checker - Free WCAG color contrast checker. Add your palette and check every foreground/background pair for AA and AAA accessibility compliance. Suggested fixes, Tailwind paste, CSV export. Nothing uploaded.

JSON ↔ CSV Converter - Free JSON to CSV and CSV to JSON converter. Handles nested objects with configurable flattening depth, null values, and delimiter options. Live preview table. Nothing uploaded.

Mortgage Overpayment Calculator - Free mortgage overpayment calculator. See how much interest you save and how many months you cut off by paying extra each month or making a lump sum payment. Nothing uploaded.

Battery Runtime Calculator - Free 12V battery runtime calculator for van builds, off-grid solar, and electronics. Add your devices, enter battery bank specs, and get days of autonomy and solar panel sizing. Nothing uploaded.

Regex Tester & Explainer - Free regex tester with plain-English explanation of every token. Type a pattern and test string to get highlighted matches, capture groups, and an explanation tree. Nothing uploaded.

Invoice Generator - Free invoice generator. Fill in a form and get a professional PDF invoice in 60 seconds. Line items, tax, payment terms, auto-incrementing invoice number. No watermark, no signup. Nothing uploaded.

Concrete & Mortar Calculator - Free concrete and mortar volume calculator. Add slabs, post holes, and strip footings to a project list and get total bags needed with mix water required. Nothing uploaded.

Seed Starting Date Calculator - Free seed starting date calculator. Enter your last frost date, pick your vegetables, and get a personalised planting calendar with indoor start, harden-off, and transplant dates. Nothing uploaded.

Nautical Unit Converter - Free nautical unit converter. Convert speed (knots, km/h, mph), distance (nm, km, miles), depth (m, ft, fathoms), pressure, and temperature. Beaufort scale lookup and passage planning. Nothing uploaded.

Font Pairing Preview Tool - Free Google Fonts pairing tool. Pick a heading and body font, type your own text, and see a live preview. Copy the CSS import snippet. Nothing uploaded.

Tattoo Stencil Size Calculator - Free tattoo stencil size calculator. Upload a design, enter target dimensions in cm or inches, and print at true 1:1 physical size using the browser print API. Nothing uploaded.

AWG Wire Gauge Calculator - Free AWG wire gauge and ampacity calculator. Enter current and run length to get minimum wire size, voltage drop %, and safety rating for DC 12V/24V and AC circuits. Nothing uploaded.

Pool Chemical Dosage Calculator - Free pool chemical dosage calculator. Enter your current chlorine, pH, and alkalinity readings to get exact grams to add for any pool volume in litres or gallons. Nothing uploaded.

Candle Making Calculator - Free candle making calculator. Enter jar size, batch count, and fragrance load to get exact wax, fragrance oil, and dye weights plus cost per candle. Nothing uploaded.

Typographic Scale Generator - Free typographic scale generator. Pick a ratio and base size to get a harmonious font scale as CSS variables with optional fluid clamp() values. Tailwind config export included. Nothing uploaded.

Time Zone Meeting Planner - Free world time zone meeting planner. Add up to 6 cities, see a 24-hour working hours grid, find the best overlap time, and copy all times at once. Nothing uploaded.

Password Entropy Calculator - Free password entropy and crack time estimator. Type any password to see entropy in bits, crack times for bcrypt/MD5/online attacks, and weakness explanations. Never transmitted.

Film Reciprocity Failure Calculator - Free film reciprocity failure calculator. Select your film stock and metered time to get the corrected long-exposure time using the Schwarzschild formula. 27 stocks from Kodak, Ilford, Fujifilm, Rollei. Nothing uploaded.

3D Print Filament Cost Calculator - Free 3D printing cost calculator. Enter filament grams used, spool price, electricity, and machine depreciation to get full COGS and suggested selling prices. Nothing uploaded.

GPS Bearing & Distance Calculator - Free GPS bearing and distance calculator. Enter two lat/lon coordinates to get distance in km/miles/nautical miles, true bearing, magnetic bearing, and a live map. Nothing uploaded.

Batch Image Resizer & Converter - Free batch image resizer. Drop up to 50 photos, set a resize rule, choose JPEG/PNG/WebP output, and download all as a ZIP. No uploads, no account, nothing leaves your browser.

Knitting Row Counter - Free knitting row counter and pattern section tracker. Build named sections with their own counters, progress bars, and notes. Saves projects to your browser. Nothing uploaded.

Historical Exchange Rate Chart - Free historical exchange rate chart. Pick any currency pair and date range to see a rate history chart, download as CSV, and see high/low/change stats. No signup, nothing uploaded.

Sheet Metal Bend Calculator - Free sheet metal bend allowance calculator. Enter thickness, bend radius, angle, and K-factor to get flat blank length for multi-bend parts. mm and inches. Nothing uploaded.

Paracord Length Calculator - Free paracord project length calculator. Pick a weave (cobra, king cobra, fishtail, diamond) and finished length to get total cord needed with buffer. Bracelets, collars, lanyards. Nothing uploaded.

Telescope Eyepiece Calculator - Free telescope eyepiece magnification calculator. Compare up to 4 eyepieces for magnification, exit pupil, true field of view, and suitability for planets, moon, or deep sky. Nothing uploaded.

Stair Stringer Calculator - Free stair stringer calculator. Enter total rise and run to get riser height, tread depth, stringer length, and IRC/UK building code compliance. Nothing uploaded.

QR Code Generator - Free QR code generator. Create QR codes for URLs, WiFi, vCard, email, and text. Custom colors, PNG download. No watermark, no signup, nothing uploaded.

Resin Art Volume Calculator - Free resin mold calculator. Enter mold shape and mix ratio to get exact Part A and Part B weights in grams and mL. Epoxy, polyester, UV resin. Nothing uploaded.

Solution Dilution Calculator - Free C1V1=C2V2 dilution calculator. Enter stock and target concentration to get exact volumes with plain-English step-by-step instructions. %, g/L, mol/L, ppm. Nothing uploaded.

Dog Age Calculator - Free dog age to human years calculator using the accurate non-linear scale by breed size. Includes life stage and life expectancy estimate. Nothing uploaded.

Lens Field of View Calculator - Free lens FoV calculator. Enter focal length and sensor format to get horizontal, vertical, and diagonal field of view, plus coverage at subject distance. Nothing uploaded.

Acoustic Room Mode Calculator - Free acoustic room mode calculator. Enter room dimensions to find resonant frequencies, worst bass clusters, Schroeder frequency, and optimal listening position. Nothing uploaded.

Retaining Wall Block Calculator - Free retaining wall calculator. Enter wall height, soil type, and block size to get minimum base width, footing depth, block count, and stability safety factor. Nothing uploaded.

Fence Post Spacing Calculator - Free fence post spacing calculator. Enter fence height, panel type, and wind zone to get maximum post spacing, footing depth, concrete volume, and post count. Nothing uploaded.

Espresso Extraction Log - Free espresso extraction ratio calculator and shot log. Enter dose and yield to get brew ratio, TDS estimate, extraction status, and grind advice. Shot history saved to your browser. Nothing uploaded.

RA/Dec to Alt/Az Converter - Free RA/Dec to Alt/Az coordinate converter for amateur astronomers. Enter right ascension, declination, observer location, and date/time to get altitude, azimuth, and rise/set times. Nothing uploaded.

Cold Plunge & Sauna Timer - Free cold plunge and sauna session timer. Choose a protocol (Huberman, basic contrast, Wim Hof) or build your own phase sequence. Session log stored in your browser. Nothing uploaded.

Workout Volume & Tonnage Tracker - Free workout volume and tonnage tracker. Log exercises with sets, reps, and weight to get total session tonnage and volume PRs. Session history saved to your browser. No account needed. Nothing uploaded.

Sewing Pattern Grading Calculator - Free sewing pattern grading calculator. Enter original and target measurements to get total grade and per-seam adjustment for each key measurement point. cm and inches. Nothing uploaded.

ASCII Art Text Generator - Free ASCII art text generator. Type text and pick a font to get FIGlet-style ASCII banner art. Copy as raw, code comment, or hash comment. Standard and Block fonts. Nothing uploaded.

Jewelry Hallmark Decoder - Free jewelry hallmark decoder. Type a fineness mark (925, 750, 375, 585, 950) to get metal type, karat, purity percentage, and intrinsic metal value from spot price. Nothing uploaded.

Crossword Grid Generator - Free crossword grid generator. Set grid size, click cells to toggle black squares with 180-degree rotational symmetry enforced. Download as SVG for print or design software. Nothing uploaded.

Sewing Needle & Thread Guide - Free sewing needle size and thread pairing guide. Select fabric type, weight, and machine to get recommended needle size, point type, thread weight, and stitch length. Nothing uploaded.

Pantone to RAL Converter - Free Pantone to RAL color converter. Find the nearest RAL Classic match for any Pantone Solid Coated code using Delta-E color distance. Top 3 matches with quality rating. Nothing uploaded.

Pipe Flow & Pressure Drop Calculator - Free pipe flow and pressure drop calculator. Enter pipe diameter, flow rate, and length to get velocity, Reynolds number, flow regime, Darcy-Weisbach pressure drop, and head loss. Nothing uploaded.

CSS Box Shadow Generator - Free CSS box shadow generator. Layer multiple shadows visually, adjust offset, blur, spread, and color per layer, then copy the CSS. Includes Material, neumorphism, and soft UI presets. Nothing uploaded.

Stamp Duty Calculator UK - Free UK stamp duty calculator 2025. England SDLT, Scotland LBTT, Wales LTT. First-time buyer relief, additional property surcharge, band-by-band breakdown and total cash needed. Nothing uploaded.

Seed to Harvest Calendar - Free seed to harvest timeline calculator. Add vegetables with sow dates and see germination, transplant, and harvest windows on a Gantt-style chart. Succession planting reminders. Nothing uploaded.

Knot Strength & SWL Calculator - Free knot strength calculator. Select your knot and rope breaking strength to get knot efficiency, resulting strength, and safe working load at 5:1, 10:1, and 15:1 safety factors. Nothing uploaded.

Cocktail Dilution & ABV Calculator - Free cocktail ABV calculator. Build your drink from ingredients, pick stirred or shaken dilution, and get final ABV, proof, total volume, calories, and standard drinks. Nothing uploaded.

Inflation & Purchasing Power Calculator - Free historical inflation calculator. See what money was worth in any year from 1913 onward. US CPI-U and UK RPI data, total and annual inflation rate, and a time-series chart. Nothing uploaded.

HVAC Duct Size Calculator - Free HVAC duct size calculator. Enter CFM and friction rate to get minimum round duct diameter, velocity, noise rating, and equivalent rectangular sizes. Nothing uploaded.

Wheel & Tire Fitment Calculator - Free wheel and tire fitment calculator. Enter stock and new wheel specs to check overall diameter change, speedometer error, and whether the new setup will rub. Nothing uploaded.

Laser Engraver Settings Finder - Free laser engraver speed and power settings finder. Select your laser wattage and material to get starting speed, power, and pass count for wood, acrylic, leather, slate, and more. Nothing uploaded.

Macro Cycling Calculator - Free macro cycling calculator. Enter your TDEE and goal to get protein, carb, and fat targets for training vs rest days. Weekly calendar view, 7-day average, protein per kg. Nothing uploaded.

Voltage Divider Calculator - Free voltage divider calculator. Enter any three of Vin, R1, R2, Vout and solve for the fourth. E24 nearest standard resistor values, current draw, power dissipation, loaded output. Nothing uploaded.

Tap Drill Size Calculator - Free tap drill size calculator for metric and imperial threads. Search M3, M6, 1/4-20 UNC and get tap drill size, clearance drill, and thread engagement percentage. Nothing uploaded.

Drip Irrigation Zone Calculator - Free drip irrigation zone flow rate calculator. Add emitters, enter supply line specs, and check whether your water pressure can supply all zones without under-watering. Nothing uploaded.

Soap Making Lye Calculator - Free cold-process soap lye calculator. Add oils, set superfat, and get exact NaOH or KOH amount and water. INS hardness value included. 16 oils. Nothing uploaded.

Bicycle Gear Ratio Calculator - Free bicycle gear ratio calculator. Enter chainrings, cassette sprockets, wheel size, and cadence to get speed for every gear combo. Gear chart, cadence slider, compare setups. Nothing uploaded.

Sourdough Hydration Calculator - Free sourdough hydration calculator. Enter flour, water, starter hydration, and salt as baker's percentages to get gram weights for any batch size. True hydration accounting for starter. Nothing uploaded.

Aquarium Fish Stocking Calculator - Free aquarium fish stocking calculator. Add species with adult size and bioload to get stocking percentage, filtration needs, and compatibility warnings. Works for freshwater and marine. Nothing uploaded.

Solar Panel Sizing Calculator - Free off-grid solar panel sizing calculator. Add appliances with wattage and daily hours to get daily consumption, recommended panel wattage, and battery bank capacity. Days of autonomy slider. Nothing uploaded.

Loan EMI Calculator - Free loan EMI calculator. Enter principal, interest rate, and term to get monthly payment, total interest paid, and amortisation schedule. Overpayment impact, payoff date. Nothing uploaded.

Depth of Field Calculator - Free depth of field calculator. Enter sensor format, focal length, aperture, and focus distance to get near/far focus limits, total DoF, hyperfocal distance, and a live diagram. Nothing uploaded.

CNC Feeds & Speeds Calculator - Free CNC router feeds and speeds calculator. Enter cutter diameter, flute count, and material to get recommended RPM, feed rate, and chip load. Deflection risk, surface finish estimate. Nothing uploaded.

Rafter Length Calculator - Free rafter length calculator. Enter building span, roof pitch, and overhang to get rafter length with birdsmouth notch dimensions. SVG cross-section diagram updates live. Nothing uploaded.

Floor Joist Span Calculator - Free floor joist span calculator. Enter lumber species, joist size, spacing, and floor load to get maximum allowable span with L/360 deflection verdict. Nothing uploaded.

Drone Flight Time Calculator - Free drone flight time calculator. Enter all-up weight, battery capacity, and voltage to estimate hover, cruise, and aggressive flight times with a 20% reserve. Battery comparison table. Nothing uploaded.

Podcast Audio File Size Calculator - Free podcast audio file size calculator. Enter duration and encoding to get file size in MB, monthly storage cost, and bandwidth at your download count. Format comparison table. Nothing uploaded.

Ring Size Converter - Free ring size converter. Enter any ring size - US, UK letter, EU numeric, Japanese, or finger circumference in mm - and get all other systems instantly. Printable ring sizer guide. Nothing uploaded.

Tile Grout Calculator - Free tile grout calculator. Enter tile dimensions, joint width, and area to get exact grout weight and bag count. Sanded vs unsanded recommendation, tile pattern SVG preview. Nothing uploaded.

RAID Storage Calculator - Free RAID storage calculator. Configure drives and RAID level to get usable space, fault tolerance, and rebuild time estimate. Compare all RAID levels side by side. Nothing uploaded.

Saltwater Aquarium Salinity Calculator - Free saltwater aquarium salinity calculator. Convert between SG, PSU/ppt, and refractometer readings. Calculate exact salt grams to add or freshwater to dilute. Temperature correction included. Nothing uploaded.

Wine & Mead Gravity to ABV Calculator - Free wine and mead gravity to ABV calculator. Enter original and final gravity to get ABV by three formula methods, apparent attenuation, residual sugar, and stuck fermentation warnings. Nothing uploaded.

Welding Amperage Calculator - Free MIG and TIG welding amperage calculator. Enter material, thickness, and joint type to get recommended amperage range, wire feed speed, and shielding gas. Position adjustments included. Nothing uploaded.

Egg Incubation Calculator - Free egg incubation hatch date calculator. Enter species and set date to get expected hatch date, candling dates, and lockdown date. Today's day counter, timeline visual, multiple clutch tracking. Nothing uploaded.

Dew Point & Condensation Risk Calculator - Free dew point calculator. Enter air temperature and relative humidity to get dew point and condensation risk on any surface. Mould risk indicator, dehumidifier sizing. Nothing uploaded.

LED Resistor Calculator - Free LED resistor calculator. Enter supply voltage, LED forward voltage, and desired current to get required resistance, nearest E24 value, power dissipation, and a simple circuit schematic. Nothing uploaded.

Beam Deflection Calculator - Free beam deflection calculator. Enter beam span, load type, and cross-section to get midspan deflection, bending moment, and L/360 pass/fail verdict. SVG deflection diagram. Nothing uploaded.

Map Scale Distance Converter - Free map scale distance converter. Enter a map scale like 1:25,000 and measure distance to get the real-world distance in km, miles, and metres. Bidirectional. Naismith walking time estimate. Nothing uploaded.

Powder Coating Coverage Calculator - Free powder coating coverage calculator. Enter surface area, coating thickness, and application method to get powder weight needed with waste factor and cost estimate. Nothing uploaded.

Concrete Block Wall Calculator - Free concrete block wall calculator. Enter wall dimensions and block size to get block count, mortar volume, and cement/sand bags. Wall elevation SVG and coursing layout. Nothing uploaded.

Candle Wick Size Guide - Free candle wick size guide. Enter jar diameter and wax type to get CD, ECO, Cotton Core, and Wood Wick recommendations side by side. Fragrance load adjustment, test protocol, wick log. Nothing uploaded.

Sous Vide Time & Temperature Guide - Free sous vide time and temperature guide. Select protein, cut, doneness, and thickness to get target temperature, minimum safe time, and maximum cook time. Pasteurisation times included. Nothing uploaded.

Float Tank Epsom Salt Calculator - Free float tank Epsom salt calculator. Enter tank volume and target specific gravity to get exact kg of salt needed with a saturation check and 25kg bag count. Nothing uploaded.

Flight Carbon Footprint Calculator - Free flight carbon footprint calculator. Enter departure and destination airport codes to get CO2e per passenger by seat class. Radiative forcing multiplier, round trip, offset cost. Nothing uploaded.

VAT Reverse Calculator - Free VAT reverse calculator. Enter a gross price and rate to extract the net price and VAT amount. Add VAT or remove VAT. UK rates, all 27 EU countries, custom rate. Nothing uploaded.

Mortgage Affordability Calculator - Free UK mortgage affordability calculator. Enter income, deposit, and monthly commitments to get maximum borrowing, property price, and monthly payment. No email needed. Nothing uploaded.

Knitting Pattern Repeat Calculator - Free knitting pattern repeat calculator. Enter original and new gauge with pattern repeat to get the new stitch count rounded to the nearest correct multiple. Nothing uploaded.

Screen Printing Ink Estimator - Free screen printing ink estimator. Enter print area, colours, mesh count, and run quantity to get ink weight and cost per colour. Underbase white calculation. Nothing uploaded.

Bullet Drop & Ballistics Calculator - Free bullet drop and trajectory calculator. Enter BC, muzzle velocity, and zero range to get drop, wind drift, and a printable range card out to 500m. MOA correction, calibre presets. Nothing uploaded.

Sous Vide Container Size Calculator - Free sous vide container capacity calculator. Enter volume and circulator wattage to get heat-up time and whether the circulator can maintain temperature. Insulation comparison. Nothing uploaded.

Canning Headspace & Processing Time Guide - Free home canning guide. Select food and jar size to get headspace, processing method, time, and altitude adjustment. USDA-based. Covers fruits, vegetables, pickles, jams, and meats. Nothing uploaded.

Carpet & Flooring Waste Calculator - Free carpet and flooring waste calculator. Enter room dimensions, roll width, and pattern repeat to get total metres to order with correct waste factor. Roll count and offcut sizes. Nothing uploaded.

Piano Chord Finder - Free piano chord finder. Click notes on an on-screen keyboard to identify the chord name, or type a chord name to see which keys to press. Seventh chords, inversions, extended chords. Nothing uploaded.

3D Print Weight & Material Cost Calculator - Free 3D print weight estimator. Enter bounding box dimensions, infill, and shell count to get estimated weight and material cost before slicing. PLA, PETG, ABS, ASA, TPU, Nylon. Nothing uploaded.

Swimming Lap Counter & Distance Tracker - Free swimming lap counter. Set pool length, tap to count laps, track total distance and pace per 100m. Screen stays on during swim. Session history saved to browser. Nothing uploaded.

Antenna Gain & Link Budget Calculator - Free RF link budget calculator. Enter transmit power, antenna gains, frequency, and path distance to get path loss, received signal level, and link margin. Friis equation. Nothing uploaded.

RC Motor KV & Prop Calculator - Free RC motor KV and propeller calculator. Enter motor KV, battery cell count, and prop size to get theoretical RPM, prop tip speed, and overspeed risk. Nothing uploaded.

Vegetable Garden Spacing Calculator - Free vegetable garden spacing calculator. Enter raised bed dimensions, add vegetables, and get plant count, a grid layout, and companion planting notes. 25 vegetables. Nothing uploaded.

Cheese Yield Calculator - Free cheese yield calculator. Enter milk volume and fat percentage to get estimated cheese yield and whey produced for hard, semi-soft, or fresh cheese. Cost per kg included. Nothing uploaded.

Textile Denier & Thread Count Converter - Free textile yarn count converter. Convert between denier, tex, dtex, metric count (Nm), and English cotton count (Ne). Fabric GSM estimator from thread count and yarn weight. Nothing uploaded.

Running Pace & Training Zone Calculator - Free running training zone calculator. Enter a recent race result to get all five training pace zones and Zone 2 easy pace. Jack Daniels VDOT methodology. Nothing uploaded.

Firewood Cord & Rick Calculator - Free firewood cord calculator. Enter your wood pile dimensions to get full cord equivalents, cubic metres, and BTU content. Verify firewood deliveries and estimate heating season needs. Nothing uploaded.

Wire Rope & Rigging SWL Calculator - Free wire rope sling SWL calculator. Enter sling configuration, rope rated load, and angle to get safe working load per leg with sling angle factor. ASME and EN safety notes. Nothing uploaded.

PV String & Array Sizing Calculator - Free solar PV string sizing calculator. Enter panel and inverter specs to get safe series string length, parallel strings, and temperature-corrected cold-day Voc check. Nothing uploaded.

Board Feet Calculator - Free board feet calculator. Enter lumber dimensions and quantity to get total board feet, cost, and a project materials list. Nominal vs. actual size guide, kerf waste toggle. Nothing uploaded.

Dovetail Joint Spacing Calculator - Free dovetail joint calculator. Enter board width, tail count, and wood type to get tail spacing, pin width, angle in degrees, and a printable 1:1 SVG layout template. Nothing uploaded.

Photo Print Size & DPI Calculator - Free photo print size calculator. Enter image pixel dimensions to get maximum print sizes at 300, 200, and 150 DPI for common print formats. Reverse mode included. Nothing uploaded.

Oven Temperature Converter - Free oven temperature converter. Enter any temperature - gas mark, conventional °C, fan oven °C, or Fahrenheit - and get all four equivalents instantly. Nothing uploaded.

Grow Light PPFD & DLI Calculator - Free grow light PPFD and DLI calculator. Enter light PPFD and photoperiod to get daily light integral and a verdict for your plant type. Adjust photoperiod to hit target DLI. Nothing uploaded.

Speaker Enclosure Volume Calculator - Free speaker enclosure calculator. Enter Thiele-Small parameters to get optimal sealed and ported enclosure volumes, predicted -3dB point, and port dimensions. Nothing uploaded.

Room Heating & Cooling Load Calculator - Free room heating and cooling load calculator. Enter room dimensions, insulation quality, window area, and climate to get BTU/hr and kW needed for a heater or air conditioner. Nothing uploaded.

Wall U-Value & R-Value Builder - Free wall U-value calculator. Add construction layers to get total R-value, U-value, and compliance check against UK Part L and Passivhaus targets. Nothing uploaded.

Photography Exposure Triangle Calculator - Free exposure triangle calculator. Set ISO, aperture, and shutter speed to see the exposure value. Equivalent exposures, DoF and motion effects explained. Nothing uploaded.

Compost Carbon-to-Nitrogen Ratio Calculator - Free compost C:N ratio calculator. Add browns and greens by weight to get the blended carbon-to-nitrogen ratio, a traffic-light verdict, and what to add to balance the pile. Nothing uploaded.

Anchor Scope Calculator - Free anchor scope calculator. Enter water depth, tidal range, and bow height to get total rode length at your chosen scope ratio. Tidal correction, swinging circle. Nothing uploaded.

Hydrometer Temperature Correction Calculator - Free hydrometer temperature correction calculator. Enter your gravity reading and sample temperature to get the corrected specific gravity at 20°C. Brix and Plato included. Nothing uploaded.

Metal Hardness Conversion Calculator - Free metal hardness converter. Enter HRC, HRB, Vickers HV, or Brinell HB to get all equivalents and approximate tensile strength. ASTM E140 based. Nothing uploaded.

Anagram & Crossword Pattern Solver - Free anagram solver and crossword pattern matcher. Enter letters with underscores as wildcards to find matching words, or unscramble letters. Works offline. Nothing uploaded.

Pet Food Portion & Daily Calorie Calculator - Free pet feeding calculator. Enter your dog or cat's weight, age, and activity level to get daily calorie needs and grams per day of their specific food. AAHA-based. Nothing uploaded.

Landscaping Materials Volume Calculator - Free landscaping materials calculator. Enter area and depth to get volume in m³, bulk bag count, and tonnes for gravel, topsoil, bark, sand, or hardcore. Nothing uploaded.

Air Compressor Fill Time Calculator - Free air compressor fill time and duty cycle calculator. Enter pump CFM, tank volume, and pressure range to get fill time and tool demand verdict. Nothing uploaded.

Golden Hour & Blue Hour Calculator - Free golden hour and blue hour calculator. Enter location and date to get exact morning and evening golden and blue hour times. 10 city presets or custom coordinates. Nothing uploaded.

Catenary Cable Sag Calculator - Free catenary cable sag calculator. Enter span, cable weight, and tension or sag to get the other value plus cable length and an SVG catenary curve. Nothing uploaded.

Capacitor Reactance & RC Circuit Calculator - Free capacitor calculator. Get capacitive reactance at any frequency, RC time constant, and -3dB cutoff frequency. pF, nF, µF, mF units. Nothing uploaded.

Impedance Matching & Transformer Ratio Calculator - Free impedance matching calculator. Enter source and load impedances to get transformer turns ratio, mismatch loss, SWR, and power transfer. Nothing uploaded.

Brick Calculator - Free brick calculator. Enter wall area, brick format, and bond pattern to get brick count, mortar volume, and cement and sand bags. Deduct openings. Nothing uploaded.

Spray Paint & Aerosol Coverage Calculator - Free spray paint coverage calculator. Enter surface area, number of coats, and can size to get the number of aerosol cans needed. Technique overspray adjustment. Nothing uploaded.

Macro Photography Magnification Calculator - Free macro photography magnification calculator. Enter focal length and minimum focus distance to get reproduction ratio, working distance, and effective aperture. Extension tube impact. Nothing uploaded.

Baking Pan Size Converter - Free baking pan size converter. Enter your recipe's pan and your pan, plus your ingredient list, and get amounts recalculated for your pan with bake time and temperature tips. Nothing uploaded.

USB-C PD Wattage Calculator - Free USB-C PD wattage calculator. Find the actual wattage your charger and cable can deliver, and which one is the bottleneck if your device won't fast-charge. Nothing uploaded.

VR IPD Calculator - Free IPD calculator for VR headsets. Measure your interpupillary distance with a ruler and get the nearest valid setting for Quest 2, Quest 3, Quest Pro, Valve Index, PSVR2, Vive Pro 2, or Apple Vision Pro. Nothing uploaded.

Induction Cooktop Amperage Calculator - Free induction cooktop circuit calculator. Enter the cooktop's kW rating and voltage to estimate amperage, recommended breaker size, and copper wire gauge. Nothing uploaded.

USB-C Dock Pass-Through Power Calculator - Free USB-C dock pass-through power calculator. Find out how much wattage actually reaches your laptop through a dock once it takes its own share. Nothing uploaded.

Data Cap Overage Cost Calculator - Free data overage cost calculator. Project your data overage and overage fee before your billing cycle ends, based on your current usage pace. Nothing uploaded.

Zero Proof Mocktail ABV Checker - Free mocktail ABV calculator. Add every ingredient's real ABV%, including non-alcoholic spirits and de-alcoholized wine, to check your drink's true alcohol content. Nothing uploaded.

Ultra Processed Food Score Calculator - Free NOVA food score calculator. Paste an ingredient list to get a plain-language ultra-processed food estimate based on common additive markers. Nothing uploaded.

AQI Health Advice Calculator - Free AQI health advice calculator. Enter your current air quality index reading and sensitivity profile to get plain-language activity advice. Nothing uploaded.

Indoor CO2 Ventilation Calculator - Free CO2 ventilation rate calculator. Enter room size, occupants, and ventilation level to estimate steady-state CO2 ppm. ASHRAE-style math made simple. Nothing uploaded.

Light Pollution & Stargazing Calculator - Free Bortle scale calculator using the Little Dipper method. Count visible stars to estimate naked eye limiting magnitude and stargazing conditions. Nothing uploaded.

Heat Pump Room Sizing Calculator - Free heat pump room sizing calculator. Enter each room's size, insulation, and windows to get BTU/hr, kW load, and recommended mini-split unit size per room. Nothing uploaded.

Drone Remote ID Compliance Checker - Free FAA Remote ID compliance checker. Answer a few questions about your drone to find out if you need registration, Remote ID, or a broadcast module. Nothing uploaded.

EV Home Charging Cost Calculator - Free EV home charging cost calculator. Compare real cost per mile and annual cost between an EV charged at home and a gas car using your own electricity rate. Nothing uploaded.

Tariff Cost Passthrough Calculator - Free tariff cost calculator. Turn a tariff percentage into the actual dollar increase on a product's shelf price, with an adjustable passthrough rate. Nothing uploaded.

Digital Detox Screen Time Savings Calculator - Free screen time savings calculator. Convert the screen time reduction you're considering into hours and dollars reclaimed per year. Nothing uploaded.

AI Coding Assistant ROI Calculator - Free AI coding assistant ROI calculator. See if your Copilot, Claude, or other AI coding subscription pays for itself based on the hours it actually saves you. Nothing uploaded.

AI Agent Task Cost Calculator - Free AI agent cost calculator. Token calculators price a single prompt - this estimates the real cost of an autonomous agent chaining many tool calls per task. Nothing uploaded.

Macrame Cord Length Calculator - Free macrame cord length calculator. Enter finished length, number of cords, and knot density to get the exact cut length per strand and total cord to buy. Nothing uploaded.

Leather Hide Square Footage Calculator - Free leather hide square footage calculator. Enter hide size and cut type to get usable square footage, plus whether one hide covers your pattern pieces. Nothing uploaded.

Ski Wax Temperature Calculator - Free ski wax temperature calculator. Enter the forecast snow or air temperature to find the matching wax category for skis or snowboards. Nothing uploaded.

Forge Temperature Calculator by Steel Type - Free forge temperature calculator by steel type. Select your steel and see the recommended heat-colour forging range plus a full heat colour chart. Nothing uploaded.

AR Glasses FOV Calculator - Compare two AR or smart glasses headsets on field of view and pixels per degree side by side. See which is wider and which is sharper. Nothing uploaded.

Home Battery Cost Per Cycle Calculator - Enter battery price, rated cycle life and warranty length to see the real cost per charge cycle and per warranty year. Nothing uploaded.

Dual SIM Data Plan Stacking Calculator - Compare stacking two smaller eSIM data plans against one bigger single plan and see which is cheaper per GB. Nothing uploaded.

Powerline Adapter Throughput Calculator - Enter your powerline adapter's advertised speed plus your wiring age and circuit distance to estimate realistic throughput. Nothing uploaded.

eSIM Travel Data Cost Calculator - Line up Airalo, Holafly, Saily and other eSIM providers side by side for your actual trip length and data needs to see who's cheapest. Nothing uploaded.

Smart Ring Battery Runtime Calculator - Free smart ring battery life calculator. Estimate real-world Oura Ring or Ultrahuman Ring Air battery runtime based on the features you actually use. Nothing uploaded.

Home AI Rig Electricity Cost Calculator - Free home AI rig electricity cost calculator. Estimate daily, monthly, and annual power cost of running GPUs for local LLM inference 24/7. Nothing uploaded.

USB4 / Thunderbolt Bandwidth Calculator - Free Thunderbolt / USB4 daisy chain bandwidth calculator. See total bandwidth used by chained monitors and drives versus port capacity. Nothing uploaded.

Drone Insurance Cost Calculator - Free drone insurance cost calculator. Estimate illustrative annual insurance cost ranges by drone weight class and use type - hobby or commercial. Nothing uploaded.

Induction Stove Cookware Compatibility Checker - Free induction cookware compatibility checker. Pick a cookware material to find out if it works on an induction stove, plus the magnet-test reminder. Nothing uploaded.

AI Subscription Stack Cost Calculator - Free AI subscription cost calculator. Add every ChatGPT, Claude, Midjourney and other AI tool you pay for and see the total monthly and annual cost, plus cost-per-use per tool. Nothing uploaded.

Context Window Budget Planner - Free context window calculator. Paste text or enter a word count to see estimated tokens used, percent of the model's context window consumed, and how many copies would fit. Nothing uploaded.

Sober Curious Budget Calculator - Free money saved not drinking calculator. Enter your typical drinks per week and price per drink to see monthly and annual alcohol-free savings, and how many weeks fund your goal. Nothing uploaded.

BNPL Total Cost Calculator - Free BNPL real cost calculator. Compare Klarna, Affirm, Afterpay and other buy now pay later plans side by side: effective APR, total cost, and per-installment amount. Nothing uploaded.

Crypto Staking Rewards Tax Calculator - Free crypto staking tax calculator. Add each staking reward with its fair market value at receipt to see your total taxable income under the dominion-and-control principle. Nothing uploaded.

Cold Plunge Protocol Timer - Free cold plunge timer. Enter water temperature to get a recommended session length from published cold-exposure protocols, plus a running countdown timer. Nothing uploaded.

Desk Job Step Count Offset Calculator - Free steps-to-offset-sitting calculator. Enter your daily sitting hours to get a research-inspired daily step target for offsetting sedentary time. Nothing uploaded.

Meal Prep Container Portion Calculator - Free meal prep portion calculator. Split a batch cook evenly across containers by weight or by macros, with the remainder added to the last container. Nothing uploaded.

Caffeine Stacking Calculator - Free caffeine stacking calculator. Add up coffee, energy drinks, pre-workout, and soda to see your total caffeine intake for the day against safe-limit guidance. Nothing uploaded.

Fire Pit Clearance Calculator - Free fire pit clearance calculator. Enter your fire pit diameter to get the required setback distance, then check nearby structures for pass/fail clearance. Nothing uploaded.

Frequently asked questions

Are BentoUtils tools really free?

Yes. Every tool is 100% free with no usage limits and no account required.

Do my files get uploaded to a server?

No. Every conversion runs entirely inside your browser using JavaScript. Your files never leave your device and are never sent to any server.

What kinds of tools does BentoUtils have?

255+ free calculators and converters spanning cooking, brewing, electronics, construction, photography, fitness, crafting, astronomy, and more - plus file tools like HEIC to PDF, GPX to CSV, and EPS to DST. New tools are added regularly.

Does BentoUtils work on iPhone and Android?

Yes. All tools run in any modern browser including Safari on iPhone and Chrome on Android - no app download needed.

One tidy bento box,
255+ tiny tools.

Browse tools by category

Read the blog

Frequently asked questions

Featured on

One tidy bento box, 255+ tiny tools.

Browse tools by category

Read the blog

Frequently asked questions

Featured on

One tidy bento box,
255+ tiny tools.