PCB Via Current Calculator

Enter your via drill size, copper plating thickness, and how much the board is allowed to heat up. Get the maximum safe current, via resistance, voltage drop, and how many vias to use in parallel. Runs entirely in your browser - nothing uploaded.

IPC-2221 ? Max current (A) Via resistance (mΩ) ? Voltage drop (mV) Power dissipation (mW) Parallel vias mm / mil toggle

Units

Via Geometry

Drill diameter common presets

Drill diameter mm ?

Copper plating thickness (µm) ?

µm

Via length / PCB thickness mm ?

Allowable Temperature Rise ?

Custom temperature rise (C)

Parallel Vias ?

Number of vias in parallel

Standard

IPC standard reference

IPC-2221 (1998) is the widely used conservative baseline. It was derived from single-layer board data. Results are on the safe side for most designs.

Max current - single via (IPC-2221)

1 via = - A

Via resistance ?

milliohms

Voltage drop ?

millivolts at max current

Power dissipated ?

milliwatts at max current

Copper cross-section ?

mil² and mm²