AWG 34 wire size, resistance and weight calculator
AWG 34 is defined by the gauge formula, not by a table: the diameter is 0.127 mm times 92 raised to the power (36 - n) / 39. Everything else follows from that and the conductor resistivity.
A rough guide: 3 to 5 A/mm2 for chassis wiring, under 2 for long runs in conduit.
- Diameter
- 0.160 144
- Area in circular mils
- 0.039 751 6
- Resistance of that length
- 85.5905 ohm
- Resistance per kilometre
- 855.905 ohm/km
- Resistance per 1000 feet
- 260.88 ohm
- Weight of that length
- 0.018 047 6
- Current at the chosen density
- 0.08 A
- Turns per centimetre, close-wound
- 62.444
Show the working
- Length of wire = 100
- Conductor = 1.724e-8
- Conductor temperature = 20
- Conductor density = 8960
- Design current density = 4
- Diameter = 0.127 * 92^((36 - (34)) / 39) = 0.160 144
- diameter_in = 0.160 144 / 25.4 = 0.006 304 88
- Cross-sectional area = pi * 0.160 144^2 / 4 = 0.020 142 4
- Area in circular mils = 0.006 304 88^2 * 1000 = 0.039 751 6
- r_per_m_20 = 1.724e-8 / (0.020 142 4 * 1e-6) = 0.855 905
- r_per_m = 0.855 905 * (1 + 0.00393 * (20 - 20)) = 0.855 905
- Resistance of that length = 0.855 905 * 100 = 85.5905
- Resistance per kilometre = 0.855 905 * 1000 = 855.905
- Resistance per 1000 feet = 0.855 905 * 304.8 = 260.88
- Weight of that length = 0.020 142 4 * 1e-6 * 100 * 8960 = 0.018 047 6
- Current at the chosen density = 0.020 142 4 * 4 = 0.080 569 6
- Turns per centimetre, close-wound = 0.160 144 > 0 ? 10 / 0.160 144 : 0 = 62.4438
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- diameter in mm = 0.127 x 92^((36 - n)/39)
- area = pi d^2 / 4
- resistance = rho x length / area
- temperature correction: R(T) = R(20) x (1 + 0.00393 (T - 20)) for copper
The gauge formula is exact: 36 AWG is 0.127 mm and 0000 AWG is 11.684 mm, with 39 steps between them in a geometric progression of ratio 92^(1/39).
The current figure is a design rule of thumb from current density, not an ampacity rating. Real ampacity depends on insulation temperature rating, bundling, ambient temperature and the wiring code in force.
Aluminium conductors of the same gauge carry about 61% of the current of copper for the same heating.
Frequently asked
What is the diameter of AWG 34 wire?
It follows from the gauge definition: 0.127 mm x 92^((36 - n)/39). The calculator shows the result in millimetres and inches.
Why does the wire gauge number go down as the wire gets thicker?
The number counts drawing operations. Each pass through a die makes the wire thinner and adds one to the gauge, so a high number means a thin wire.