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Wire Gauge Converter

AWG and SWG to mm², diameter, circular mils and resistance per length.

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Quick Tool Overview

The Wire Gauge Converter translates between AWG, SWG, square millimetres, diameter and kcmil, and gives resistance per kilometre and per thousand feet for copper or aluminium conductors.

What it does
Converts wire gauges and cable sizes
You give it
An AWG or SWG gauge, area or diameter
You get back
Area, diameter, nearest gauges and resistance
Best for
Matching cables across American, British and metric standards
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About the Wire Gauge Converter

Wire is sized by gauge in North America, by cross-sectional area in square millimetres almost everywhere else, and by the older British Standard Wire Gauge on a lot of existing equipment. The three systems do not line up, which makes matching a cable from one standard to another genuinely awkward.

Start from an AWG number (including 4/0), an SWG number, a cross-section in mm², a diameter in millimetres or inches, or an area in kcmil. The converter gives the area, diameter, circular mils and resistance per kilometre and per thousand feet for copper or aluminium, plus the nearest AWG, the nearest SWG and the next standard metric size up. Add a run length to get the resistance of that length of wire.

Key features of the Wire Gauge Converter

Three systems

AWG, the British Standard Wire Gauge and metric mm² sizes are all accepted and cross-referenced.

Nearest standard sizes

Any size is matched to the nearest AWG, the nearest SWG and the next IEC metric cable size up.

Resistance per length

Ohms per kilometre and per 1,000 feet for copper or aluminium, and for your own run length.

Handles 4/0 and 0000

Large aught sizes can be typed either way.

Full AWG table

AWG 4/0 to 40 is tabled with diameter, area and resistance, your size highlighted.

How to use the Wire Gauge Converter

  1. 1

    Choose what you have

    An AWG or SWG gauge, a cross-section in mm², a diameter or an area in kcmil.

  2. 2

    Enter the value

    Gauges accept forms like 12, 1/0 or 0000; sizes accept decimals.

  3. 3

    Pick the conductor

    Copper or aluminium changes the resistance figures.

  4. 4

    Read the equivalents

    See the nearest gauge in each system and the full AWG table, with resistance for your run length if given.

Frequently asked questions

About 3.31 mm², with a diameter of 2.05 mm. The nearest standard metric cable is 4 mm²; 2.5 mm² is slightly smaller than 12 AWG.

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