3/0 AWG in mm²

Answer
85.03 mm² · Ø 10.40 mm

3/0 AWG has a cross-section of 85.03 mm² (167,806 circular mils) and a solid-conductor diameter of 10.40 mm (0.4096 in). The next standard metric size is 95 mm².

Free, no sign-upInstant resultsUpdated October 2026
Conductor
A
Phase
Voltage drop
–
How we calculated this

    For estimating and educational purposes only. Results are approximate and are not a substitute for a licensed professional, the manufacturer's instructions or your local code. Disclaimer

    More questions like this

    18 AWG16 AWG14 AWG12 AWG10 AWG8 AWG6 AWG4 AWG3 AWG2 AWG1 AWG1/0 AWG2/0 AWG4/0 AWGAll quick answers

    3/0 AWG specifications

    PropertyValue
    Area85.03 mm²
    Circular mils167,806
    Diameter (solid)10.40 mm / 0.4096 in
    Resistance, copper, 20 °C0.203 Ω/km · 0.062 Ω/1000 ft
    Ampacity, copper 75°C (NEC 310.16)200 A
    Nearest metric size95 mm²

    Diameter from the AWG formula d = 0.127 × 92^((36 − n) ÷ 39) mm. Stranded wire has a slightly larger outside diameter.

    Frequently asked questions

    What is 3/0 AWG in mm²?

    85.03 mm².

    What metric cable replaces 3/0 AWG?

    95 mm², the next standard size up.

    Open the full calculator: Voltage Drop Calculator →