Electrical · Free Calculator
AWG to mm² Wire Size Calculator
Convert American Wire Gauge (AWG) sizes to metric cross section and diameter, or find the nearest AWG for a metric conductor.
AWG to mm²mm² to AWGDiameterResistance per km
Cross section2.081 mm²
Diameter1.628 mm
Diameter64.08 mil
Copper resistance8.285 Ω/km at 20 °C
How this result was calculated
- d = 0.127 × 92(36 − n)/39 = 1.628 mm
- A = π/4 × d² = 2.081 mm²
Common AWG sizes
| AWG | mm² | Diameter (mm) |
|---|---|---|
| 00 | 67.43 | 9.266 |
| 0 | 53.48 | 8.251 |
| 2 | 33.63 | 6.544 |
| 4 | 21.15 | 5.189 |
| 6 | 13.3 | 4.115 |
| 8 | 8.366 | 3.264 |
| 10 | 5.261 | 2.588 |
| 12 | 3.309 | 2.053 |
| 14 | 2.081 | 1.628 |
| 16 | 1.309 | 1.291 |
| 18 | 0.823 | 1.024 |
| 20 | 0.5176 | 0.8118 |
| 22 | 0.3255 | 0.6438 |
| 24 | 0.2047 | 0.5106 |
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AWG Formula
d (mm) = 0.127 × 92(36 − n) ÷ 39
A (mm²) = π ÷ 4 × d²
A (mm²) = π ÷ 4 × d²
n is the gauge number; 0 = 0, 00 = −1, 000 = −2 and 0000 = −3. Smaller gauge numbers are thicker wires.
Worked example
14 AWG has a diameter of 1.628 mm and a cross section of 2.08 mm², close to the metric 2.5 mm² size.
Key insight: AWG and metric sizes do not match exactly. When replacing an AWG cable, choose the next larger metric size to keep the same current rating.
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Frequently Asked Questions
What is 14 AWG in mm²?
2.08 mm². The nearest common metric size is 2.5 mm².
What AWG is 1.5 mm²?
1.5 mm² falls between 16 AWG (1.31 mm²) and 15 AWG (1.65 mm²), and is usually treated as 16 AWG or replaced by 14 AWG.
Why does a bigger AWG number mean a thinner wire?
The number originally counted the drawing steps used to make the wire. More steps produce a thinner wire.
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