AWG wire gauge chart with resistance per km
Pick a gauge to see its resistance per km, then scan the full chart of all gauges.
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How to use it
- Enter awg gauge and metal.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Resistance (Ω/km) = 1000 × resistivity / area (mm²). Standard annealed copper (100% IACS) is 1/58 Ω·mm²/m; aluminum is taken at 61% IACS.
Example
Inputs: AWG gauge = 14, Metal = Copper. Result: Resistance per km: 8.2855 Ω/km; Resistance per 1000 ft: 2.5254 Ω; Cross-section area: 2.0809 mm².
Limits and caveats
- Resistance is for solid wire at 20 °C; copper rises about 0.4% per degree of warming.
- Aluminum alloys vary; the value here is for electrical-grade aluminum at 61% IACS.
Questions about this tool
What is the resistance of 14 AWG copper wire?
About 8.29 Ω per km at 20 °C, or 2.53 Ω per 1000 ft.
What does IACS mean?
The International Annealed Copper Standard, which sets reference copper at 1/58 Ω·mm²/m at 20 °C.
How do I get voltage drop from the chart?
Multiply the resistance per km by the out-and-back length in km, then by the current in amps.