This wire diameter calculator finds a conductor’s diameter from its cross-sectional area, or from its AWG gauge. Enter a value above to get the diameter in millimeters.
Formulas
From area: d = 2 × √(A ÷ π) From gauge: d (mm) = 0.127 × 92^((36 − n) ÷ 39)
Example
Area = 2 mm²: d = 2 × √(2 ÷ π) = 1.60 mm.
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Frequently Asked Questions
How do I find wire diameter from area?
Take the square root of area over pi, then double it: d = 2 x sqrt(A / pi).
How do I get diameter from AWG?
Use d = 0.127 x 92^((36 – n)/39) millimeters, where n is the AWG number.
Is diameter the same as gauge?
No. Gauge is an index; diameter is the physical width. A smaller gauge number means a larger diameter.