Wire Gauge / Ampacity Calculator
AWG to resistance and current capacity. Pick the right wire.
// copper wire · chassis wiring ratings · 60 °C insulation · free air
Diameter
0.644 mm
0.0254 in
Resistance
52.9 mΩ / m
16.1 mΩ / ft
Max current
3 A
chassis / free air
// voltage drop calculator
▸ show notes
Ratings: single copper conductor, 60 °C insulation, free air (chassis wiring).
Derate 20–40% for bundled cables, conduit, or elevated ambient temperature.
R_wire = Ω/m × length
V_drop = I × (R_wire × 2) // ×2 for round-trip
Derate 20–40% for bundled cables, conduit, or elevated ambient temperature.
R_wire = Ω/m × length
V_drop = I × (R_wire × 2) // ×2 for round-trip
AWGwireampacityresistancegauge