How to convert AWG to mm
When you want to calculate AWG from diameter (in mm) or cross sectional area (in mm²), the values are generally rounded of to the nearest AWG equivalents.
Wire diameter calculation
The n gauge wire diameter dn in millimeters (mm) is equivalent to:
dn (mm) = 0.127 mm × 92(36-n)/39
0.127mm is the diameter of gauge #36.
Wire cross sectional area calculation
The n gauge wire’s cross sectional area An in square millimeters (mm2) is given by the formula:
An (mm2) = (π/4)×dn2 = 0.012668 mm2 × 92(36-n)/19.5