WIRE GAUGE CHARTS
1 wire in mm
Thickness: 7.35 mm diameter (0.289 inches), 42.41 mm² cross-section of solid copper.
Specifications
- Diameter
- 7.35 mm
- Diameter (imperial)
- 0.289 in
- Cross-section
- 42.41 mm²
- Area (kcmil)
- 83.7
- Copper resistance
- 0.124 Ω/1000 ft
- Copper resistance (metric)
- 0.41 Ω/km
- Copper weight
- 380.0 g/m
- Ampacity (NEC 75 °C)
- 130 A
Nearest metric sizes
42.41 mm² does not match a standard metric cable size exactly. The closest conventional cross-sections are25 mm², 35 mm² and 50 mm²— engineers round this wire up (larger cross-section) for ampacity, or accept the raw equality for signal work.
One gauge away:2 · thinner1/0 · thickerFull chart →
Frequently asked questions
Is 1 gauge wire thick or thin?
1 gauge wire is 7.35 mm in diameter. On the AWG scale a lower number means a thicker wire, so 1 AWG sits toward the thick end, where service and feeder wires live.
How many amps can 1 gauge wire carry?
NEC Table 310.16 rates 1 AWG copper at 130 A in the 75 °C column (see our amp chart for 60/75/90 °C ratings). Use the calculator to check voltage drop at your run length; long runs often force one size thicker.
What diameter is 1 wire in millimeters?
1 gauge wire is 7.35 mm (0.289 in) in diameter, with a solid-conductor cross-section of 42.41 mm².