Why trace width matters
PCB traces have resistance. When current flows through copper, heat is generated.
Main parameters
The required width depends on current, copper thickness, ambient temperature, allowed temperature rise and board stackup.
Copper thickness
Standard copper thickness is often specified in ounces. 1 oz copper is approximately 35 µm thick.
Voltage drop
For high-current designs, voltage drop can matter as much as temperature.
Practical design notes
Use conservative margins for power electronics, battery systems, motor drivers and LED power boards.
Use the calculator
Try the related tool and calculate your own values instantly.
Open PCB Trace Width Calculator