Convert wire sizes between mm², AWG and SWG instantly. Useful when reading US or UK datasheets or specifying imported equipment against NZ/AU standards.
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Enter a wire size in any unit and get the equivalents in all other standards.
2.5 mm² is approximately 13 AWG. The standard NZ/AU 2.5 mm² cable for 20A circuits is slightly larger than 14 AWG (2.08 mm²) used in North American wiring.
AWG is the North American standard; SWG is the older British Imperial standard. Both use inverse numbering where a higher number = smaller wire. Modern NZ/AU work uses metric mm² per AS/NZS 3000.
4 mm² is approximately 11 AWG. It falls between the common 10 AWG (5.26 mm²) and 12 AWG (3.31 mm²) North American sizes.
NZ, AU and most of the world use metric mm² as specified in IEC and AS/NZS standards. The mm² figure directly represents the conductor cross-sectional area, making current-capacity calculations straightforward.
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