Amp to Wire Size Calculator
Determine correct wire gauge (AWG) for electrical circuits based on current. Free electrical calculator.
About This Calculator
Determine the correct wire gauge (AWG) for electrical circuits based on current load. Free online electrical calculator for safe wiring installations.
This free online calculator is part of Calculys comprehensive tool suite. Results update instantly and can be shared via URL.
How It Works
Enter your values and click Calculate. The tool uses validated formulas to compute accurate results with interactive charts and a detailed breakdown table.
Frequently Asked Questions
How is wire gauge determined?
Based on current capacity (ampacity) from NEC tables. 15A = 14 AWG, 20A = 12 AWG, 30A = 10 AWG.
What wire size for 20 amps?
12 AWG copper wire minimum for 20A circuits. Used for kitchen, bathroom, and garage outlets in US.
What is the maximum current for 14 AWG?
15 amps maximum for 14 AWG copper wire. Used for lighting circuits in residential wiring.
Does wire length affect gauge?
Yes, for long runs (100+ ft), voltage drop requires upsizing the wire gauge. Use voltage drop calculator for accuracy.
What is the difference between AWG and metric?
AWG: American Wire Gauge. Smaller number = thicker wire. 4/0 (0000) = ~11.7mm. Metric: mm2 cross-section area.