Find AWG from Conductor Diameter
Use the table below as a quick reference to find the American Wire Gauge (AWG) value for a given solid conductor diameter in millimetres (mm).
| Wire Diameter (mm) | AWG Value | Wire Diameter (mm) | AWG Value | Wire Diameter (mm) | AWG Value | Wire Diameter (mm) | AWG Value |
|---|---|---|---|---|---|---|---|
| 13.12 | 5/0 | 3.67 | 7 | 1.024 | 18 | 0.286 | 29 |
| 11.68 | 4/0 | 3.26 | 8 | 0.912 | 19 | 0.255 | 30 |
| 10.40 | 3/0 | 2.91 | 9 | 0.812 | 20 | 0.227 | 31 |
| 9.27 | 2/0 | 2.59 | 10 | 0.723 | 21 | 0.202 | 32 |
| 8.25 | 0 | 2.30 | 11 | 0.644 | 22 | 0.180 | 33 |
| 7.35 | 1 | 2.05 | 12 | 0.573 | 23 | 0.160 | 34 |
| 6.54 | 2 | 1.83 | 13 | 0.511 | 24 | 0.143 | 35 |
| 5.83 | 3 | 1.63 | 14 | 0.455 | 25 | 0.127 | 36 |
| 5.19 | 4 | 1.45 | 15 | 0.405 | 26 | 0.113 | 37 |
| 4.62 | 5 | 1.29 | 16 | 0.361 | 27 | 0.101 | 38 |
| 4.11 | 6 | 1.15 | 17 | 0.321 | 28 | 0.0897 | 39 |
Formula for Calculating Diameter
To calculate the diameter (in mm) of a solid conductor from a known AWG value, you can use this formula:
D(mm) = 0.127 × 92(36 - AWG) / 39
Example Calculation
To find the diameter of a 14 AWG wire:
- Calculate the exponent: (36 - 14) / 39 = 0.5641
- Calculate the power of 92: 920.5641 = 12.82
- Calculate the final diameter: 0.127 × 12.82 = 1.63mm
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