Wire Gauge Calculator
AWG → diameter, area, and R/m (copper)
How to Use This Calculator
Enter an American Wire Gauge (AWG) size to compute diameter, cross-sectional area, and resistance per meter for copper at 20°C.
Formula
d(mm) = 0.127 × 92^((36 − AWG)/39)
A = π(d/2)²
R/m = ρ/A
- ρ (copper, 20°C) ≈ 1.724×10⁻⁸ Ω·m
Frequently Asked Questions
Does temperature affect resistance?
Yes. Values shown are at 20°C. For higher temperatures, resistance increases.
What about aluminum?
This tool assumes copper. Aluminum has higher resistivity (≈2.82×10⁻⁸ Ω·m).