Maker & Reference
Wire Ampacity Quick Calculator
Maximum current any AWG wire can carry safely. Based on NEC 310.16 for 60°C, 75°C, and 90°C insulation.
Ampacity
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- Auto/12V max
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- 15A breaker?
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- cross-section (sq mm)
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FAQ
Why three temp ratings? +
Higher temp insulation runs hotter without failing. THHN (90°C) carries more current than TW (60°C) in same gauge.
Automotive different? +
Yes — automotive wire derates because bundled in looms with heat. Use 60% of NEC values as a safe rule of thumb.