Wire Gauge Calculator
Find the right AWG wire size for your current, length and voltage-drop requirements in seconds.
AWG & Voltage Drop Calculator
Ampacity Calculator
Harness Cost Estimator
Connector Selector
AWG to mm² Conversion Table
| AWG | Cross-Section (mm²) | Resistance (Ω/1000 ft) |
|---|---|---|
| 10 | 5.31 | 3.28 |
| 12 | 3.35 | 5.21 |
| 14 | 2.08 | 8.29 |
| 16 | 1.31 | 13.2 |
| 18 | 0.82 | 21.4 |
| 20 | 0.518 | 33.9 |
| 22 | 0.326 | 53.8 |
| 24 | 0.205 | 86.0 |
| 26 | 0.128 | 136 |
Frequently Asked Questions
How do I choose the right AWG wire size?
Consider three factors: the current the wire must carry, the allowed voltage drop over the length, and the required mechanical strength. This calculator combines all three and recommends the smallest safe gauge.
What is the difference between AWG and mm²?
AWG is the American Wire Gauge standard, while mm² is the metric cross-section. AWG 20 ≈ 0.5 mm², AWG 16 ≈ 1.3 mm², AWG 12 ≈ 3.3 mm². See the conversion table above.
Why does bundled cable need derating?
Bundled cables cannot dissipate heat as easily. Standards require derating the ampacity by 30-50% depending on the number of cables and ambient temperature.
Does ambient temperature affect wire selection?
Yes. Above 30°C the ampacity of copper wire decreases. At 70°C ambient, a wire may carry only 60-75% of its rated current. Also check the temperature rating of the insulation.
Can Kaweei produce custom gauge harnesses?
Yes. We manufacture custom harnesses from AWG 32 to 2/0 with UL, VDE and RoHS compliant materials. Send us your drawing for a quote within 24 hours.
Need a Custom Wire Harness?
Send us your requirements and receive a free quotation with DFM feedback within 24 hours.
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