BMI & Healthy Weight Range Calculator
Enter your height and weight to get your BMI, the healthy weight range for your height, and exactly how much to gain or lose to reach it. Includes Asian BMI thresholds and waist-to-height ratio check. Nothing uploaded.
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BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or body fat distribution. Athletes and highly muscular individuals often have a high BMI without excess body fat.
Learn more: how BMI is calculated, its limits, and FAQ
How BMI is calculated
BMI = weight (kg) ÷ height (m)². For someone 175cm (1.75m) tall weighing 75kg: 75 ÷ (1.75 × 1.75) = 75 ÷ 3.06 = 24.5 - inside the WHO's 18.5-24.9 "normal weight" range.
BMI thresholds
The World Health Organization classifies adult BMI as underweight (below 18.5), normal (18.5-24.9), overweight (25-29.9), and obese (30+). For East Asian populations, the WHO Expert Consultation recommends lower cut-offs - overweight at 23+, obese at 27.5+ - because health risk rises at a lower BMI in these populations. Sources: WHO obesity and overweight fact sheet, WHO Expert Consultation, The Lancet (2004).
Does age or sex change the calculation?
The formula is identical for adult men and women - only the interpretation differs by context. Children and teens (under 20) are assessed against age- and sex-specific growth charts instead of the fixed adult thresholds, since healthy body composition shifts through puberty. For adults over 65, a slightly higher BMI (closer to 25-27) is sometimes protective rather than risky, since age-related muscle loss can mask fat gain at a "normal" BMI. The 18.5-24.9 range above is calibrated for ages 20-65.
Why BMI alone can mislead
BMI can't tell muscle from fat or see where fat is stored. A heavily muscled athlete can show "overweight" with no excess body fat. If you train regularly, pair this with our training zones calculator or workout volume tracker for a fuller picture - and use the waist-to-height ratio above, which is more predictive of cardiovascular risk than BMI alone.
FAQ
What is the healthy weight range for 175cm?
Roughly 56.7-76.6 kg (BMI 18.5-25), or 56.7-70.4 kg using Asian thresholds (BMI 18.5-23). Enter your own height above for an exact figure.
Is BMI accurate for athletes?
No - BMI doesn't separate muscle mass from fat mass. Waist-to-height ratio and body-fat percentage are better indicators for muscular or highly trained individuals.