About Wire Size Calculator
Select the proper electrical copper wire gauge (AWG) based on circuit amperage and distance.. Designed for accurate, instantaneous calculations with zero wait time.
Formula
NEC Ampacity Ratings & 3% Maximum Voltage Drop Guidelines
Example Calculation
A 20 Amp circuit up to 75ft requires 12 AWG copper wire.
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.