WIRE GAUGE CHARTS
18 wire in mm
Thickness: 1.02 mm diameter (0.040 inches), 0.82 mm² cross-section of solid copper.
Specifications
- Diameter
- 1.02 mm
- Diameter (imperial)
- 0.040 in
- Cross-section
- 0.82 mm²
- Area (kcmil)
- 1.6
- Copper resistance
- 6.385 Ω/1000 ft
- Copper resistance (metric)
- 20.95 Ω/km
- Copper weight
- 7.4 g/m
- Free-air rating (typical)
- 0 A
Nearest metric sizes
0.82 mm² does not match a standard metric cable size exactly. The closest conventional cross-sections are0.5 mm², 0.75 mm² and 1 mm²— engineers round this wire up (larger cross-section) for ampacity, or accept the raw equality for signal work.
One gauge away:19 · thinner17 · thickerFull chart →
Frequently asked questions
Is 18 gauge wire thick or thin?
18 gauge wire is 1.02 mm in diameter. On the AWG scale a lower number means a thicker wire, so 18 AWG sits in the mid-power range used for appliances and small feeders.
What diameter is 18 wire in millimeters?
18 gauge wire is 1.02 mm (0.040 in) in diameter, with a solid-conductor cross-section of 0.82 mm².