Wire gauge · AWG & SWG
Wire gauge · AWG & SWG: use gauge standard, gauge number (−1 = 2/0, −3 = 4/0). Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
AWG diameter = 0.127 × 92^((36−gauge)/39) mm; SWG uses a standard lookup.
Variables & units
- Gauge standard
- Select an option
- Gauge number (−1 = 2/0, −3 = 4/0)
- Numeric value · minimum -6, maximum 50
Worked example
AWG 12 diameter is approximately 2.0525 mm; SWG 12 is 2.6416 mm.
Assumptions
Gauge describes geometry, not allowable current. Insulation, conductor material, temperature, installation and local codes determine ratings.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
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