Wire Size Calculator
Determine the correct wire gauge (AWG) for your application to prevent voltage drop and overheating.
Recommended Wire Size
10 AWG
Voltage Drop: 1.2 V (1.0%)
Note: This calculation focuses on voltage drop. You must also ensure the wire's ampacity rating exceeds your load of 10A. Consult NEC tables or a licensed electrician.
Voltage Drop Formula
Calculations are based on the standard voltage drop formula:
VD = (2 × K × L × I) / CM
- VD: Voltage Drop
- K: Resistivity (12.9 for Copper, 21.2 for Aluminum)
- L: One-way length in feet
- I: Current in Amps
- CM: Circular Mils (area of wire)
We calculate the required Circular Mils and find the closest standard AWG size that satisfies the voltage drop limit.