PCB Trace Width Calculator

IPC-2221 compliant trace width for a given current, temperature rise, copper weight, and layer position. Returns width in millimetres and mils plus cross-sectional area.

DomainPCB DesignStandardIPC-2221Versionv1.0.0Added2026-05-16

Inputs

CurrentA

Temperature Rise°C

Copper Weightoz/ft²

1 oz/ft² ≈ 1.378 mil thick

Layer

Inner-layer traces dissipate heat worse — use ~half the constant.

Result

version1.0.0standardIPC-2221

POST /v1/pcb-design/pcb-trace-width

curl -X POST https://api.toolsamurai.com/v1/pcb-design/pcb-trace-width \
  -H "Authorization: Bearer sk_live_•••••••••••••••" \
  -H "Content-Type: application/json" \
  -d '{
     "current_a": 3.5,
     "temp_rise_c": 10,
     "copper_weight_oz": 1,
     "layer": "outer"
  }'

pcbtrace-widthipc-2221currentcopper