PCB trace width
Preliminary internal and external copper trace width estimates using the IPC-2221 empirical relationship.
Inputs
Calculations run in your browser. Your input values are not submitted or saved.
Results
- External trace width
- 0.300386521 mm
- Internal trace width
- 0.781437463 mm
This legacy IPC-2221 model is only a preliminary estimate. Use thermal analysis/IPC-2152, manufacturer specifications and actual board conditions for final design. Model limits: 35 A maximum and a temperature rise of 10–100°C.
Formula & guidance
A(mil²)=[I/(k ΔT^0.44)]^(1/0.725); w=A/t
This legacy IPC-2221 model is only a preliminary estimate. Use thermal analysis/IPC-2152, manufacturer specifications and actual board conditions for final design. Model limits: 35 A maximum and a temperature rise of 10–100°C.
Change the example inputs and check each field’s units. Use equipment datasheets and applicable project standards for final decisions. Results do not establish Canadian electrical-code compliance or certify a design.