Free PCB Trace Width
Estimate required PCB trace width based on current capacity and temperature rise. Derived from IPC-2221 standards for safe circuit board design.
Configuration
How to Use
- Enter the maximum Current (Amps) the trace will carry.
- Enter the allowable Temperature Rise (usually 10°C or 20°C).
- The calculator provides the minimum Trace Width in mils for an external PCB layer.
Common Use Cases
- PCB Design
Frequently Asked Questions
What is 'Temp Rise'?
It is the allowable increase in trace temperature above ambient due to current flow. 10°C is a conservative standard for most designs.
What are mils?
A mil is 1/1000th of an inch. It is the standard unit for PCB layout dimensions.
Pro Tip
For external layers, 1oz copper.
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