Wire gauge calculator
Convert AWG 0–40 to theoretical bare-wire diameter in mm and circular area in mm².
Formula
d = 0.127 × 92^((36 − AWG)/39); A = πd²/4
Diameter (mm) ≈ 0.127×92^((36-(12))÷39) · Cross-section (mm²) ≈ pi×(2.052525388)^2÷4
How to use
- Enter an integer AWG from 0 to 40.
- Read the bare-wire diameter.
- Read the circular cross-section.
Examples
- AWG 36 has theoretical diameter 0.127 mm.
Frequently asked questions
Does a higher AWG mean thicker wire?
No. Increasing the gauge decreases its diameter.
Does this choose a safe wire size?
No. Ampacity depends on installation and applicable rules.
Is this the outer cable diameter?
No. Insulation and stranded construction are excluded.
Sources
Updated: