Convert AWG wire sizes to square millimeters or find the nearest AWG by absolute area difference, with conductor diameter, circular mils, cm², and square inches. This conversion does not determine ampacity or a safe cable size.
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AWG To mm² Formula
The following formula is used to calculate the conversion from American Wire Gauge (AWG) to square millimeters (mm²) for a solid round conductor.
Variables:
- mm² is the cross-sectional area in square millimeters
- AWG is the American Wire Gauge number
To calculate the cross-sectional area in square millimeters, subtract the AWG number from 36. Divide the result by 19.5 and raise 92 to the power of this quotient. Multiply the result by π × 0.127² / 4 (approximately 0.012668).
| AWG | Square millimeters (mm²) |
|---|---|
| 40 | 0.005 |
| 38 | 0.008 |
| 36 | 0.013 |
| 34 | 0.020 |
| 32 | 0.032 |
| 30 | 0.051 |
| 28 | 0.081 |
| 26 | 0.129 |
| 24 | 0.205 |
| 22 | 0.326 |
| 20 | 0.518 |
| 18 | 0.823 |
| 16 | 1.309 |
| 14 | 2.081 |
| 12 | 3.309 |
| 10 | 5.261 |
| 8 | 8.366 |
| 6 | 13.302 |
| 4 | 21.151 |
| 0 | 53.475 |
| * Rounded to 3 decimals. Values are typical cross-sectional areas for solid AWG conductors. | |
What is AWG To mm²?
AWG to mm² is a conversion between an AWG wire size (a standardized gauge number) and a metric cross-sectional area value in square millimeters (mm²). AWG stands for American Wire Gauge, a standard used primarily in North America, while mm² stands for square millimeters, a metric unit used internationally. The larger the AWG number, the smaller the wire diameter and cross-sectional area; conversely, a larger cross-sectional area (mm²) corresponds to a smaller AWG number.
How to Calculate AWG To mm²?
The following steps outline how to calculate the cross-sectional area in square millimeters (mm²) using the formula for AWG to mm² conversion:
- First, determine the AWG number.
- Next, subtract the AWG number from 36.
- Divide the result by 19.5.
- Raise 92 to the power of the quotient obtained in the previous step.
- Multiply the result by π × 0.127² / 4 (approximately 0.012668).
- Finally, calculate the cross-sectional area in mm².
- After inserting the AWG number and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge:
AWG number = 18
