34 AWG wire size
0.16 mm · 0.02 mm²
0.0063 in diameter · 855.905 Ω/km in copper
What 34 AWG is used for
Transformer and motor coil winding.
The numbers
| Diameter | 0.16 mm · 0.0063 in |
| Cross-sectional area | 0.0201 mm² |
| Resistance, copper | 855.905 Ω/km · 260.88 Ω per 1,000 ft |
| Resistance, aluminium | 1400.031 Ω/km |
| NEC 60 °C copper ampacity | — outside the common building-wire range |
How 34 compares
The gauge scale is geometric, so the useful comparisons are ratios rather than differences. 28 AWG is twice the diameter, which is four times the area.
| Gauge | Diameter | Area | Ω/km copper | vs 34 |
|---|---|---|---|---|
| 28 | 0.321 mm | 0.081 mm² | 212.9 | 4.02× the area |
| 30 | 0.255 mm | 0.051 mm² | 338.53 | 2.53× the area |
| 32 | 0.202 mm | 0.032 mm² | 538.28 | 1.59× the area |
| 36 | 0.127 mm | 0.013 mm² | 1360.94 | 0.63× the area |
| 38 | 0.101 mm | 0.008 mm² | 2163.98 | 0.4× the area |
| 40 | 0.08 mm | 0.005 mm² | 3440.87 | 0.25× the area |
Frequently asked questions
What is 34 AWG in mm?
0.16 mm in diameter (0.0063 inches), with a cross-sectional area of 0.02 mm².
Is 34 AWG used for power wiring?
Not for building circuits. It is a signal and low-current gauge — thinner than anything a domestic branch circuit uses.
What is the resistance of 34 AWG copper?
855.905 Ω per kilometre, or 260.88 Ω per 1,000 feet, for annealed copper at 20 °C. The same gauge in aluminium is about 1400.03 Ω/km — 1.64 times higher, which is why aluminium wiring is sized larger for the same load.
Why do smaller AWG numbers mean thicker wire?
The number counts drawing operations. Wire is pulled through progressively smaller dies, and the gauge records how many passes it took — so more passes means a higher number and a thinner wire.