Cable & wire unit converter — AWG, SWG, mm², kcmil

The converter reduces every input to conductor diameter: for mm² it uses d = 2 × √(A/π), then AWG = 36 − 39 × log₉₂(d / 0.127). As an example, 2.5 mm² — the IEC 60228 standard size for 15 A household runs — is closest to 13 AWG (≈1.78 mm diameter).

AWG and SWG (British Standard Wire Gauge) are different diameter scales that assign different diameters to the same gauge number. For example, 10 SWG is about 3.25 mm, while 10 AWG is about 2.59 mm. Always confirm which standard a datasheet uses — the converter interpolates SWG from a standard size table.

kcmil is converted to mm² via the fixed constant 1 kcmil = 0.5067 mm² (1 cmil = 0.0005067 mm²). For example, 250 kcmil — a common large power conductor — is about 126.7 mm².