Wire Resistance Calculator

Estimate conductor resistance by AWG, length, and material using ohms-per-kft reference data.

8 AWG copper @ 25 ft =

0.0195 ohm

Representative value from the Wire Resistance Calculator reference table.

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Wire Resistance Calculator

Estimate conductor resistance for design and voltage-drop checks.

Estimated Resistance

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Reference Table

Use this complete table for quick lookup and internal linking to specific value pages.

Wire Resistance Calculator Reference
Conductor	Resistance	Length (ft)
14 AWG copper @ 25 ft	0.0785 ohm	25
14 AWG copper @ 50 ft	0.157 ohm	50
14 AWG copper @ 75 ft	0.2355 ohm	75
14 AWG copper @ 100 ft	0.314 ohm	100
14 AWG copper @ 150 ft	0.471 ohm	150
14 AWG copper @ 200 ft	0.628 ohm	200
14 AWG copper @ 300 ft	0.942 ohm	300
14 AWG copper @ 500 ft	1.57 ohm	500
14 AWG copper @ 750 ft	2.355 ohm	750
14 AWG copper @ 1000 ft	3.14 ohm	1,000
12 AWG copper @ 25 ft	0.0495 ohm	25
12 AWG copper @ 50 ft	0.099 ohm	50
12 AWG copper @ 75 ft	0.1485 ohm	75
12 AWG copper @ 100 ft	0.198 ohm	100
12 AWG copper @ 150 ft	0.297 ohm	150
12 AWG copper @ 200 ft	0.396 ohm	200
12 AWG copper @ 300 ft	0.594 ohm	300
12 AWG copper @ 500 ft	0.99 ohm	500
12 AWG copper @ 750 ft	1.485 ohm	750
12 AWG copper @ 1000 ft	1.98 ohm	1,000
10 AWG copper @ 25 ft	0.031 ohm	25
10 AWG copper @ 50 ft	0.062 ohm	50
10 AWG copper @ 75 ft	0.093 ohm	75
10 AWG copper @ 100 ft	0.124 ohm	100
10 AWG copper @ 150 ft	0.186 ohm	150
10 AWG copper @ 200 ft	0.248 ohm	200
10 AWG copper @ 300 ft	0.372 ohm	300
10 AWG copper @ 500 ft	0.62 ohm	500
10 AWG copper @ 750 ft	0.93 ohm	750
10 AWG copper @ 1000 ft	1.24 ohm	1,000
8 AWG copper @ 25 ft	0.0195 ohm	25
8 AWG copper @ 50 ft	0.0389 ohm	50
8 AWG copper @ 75 ft	0.0584 ohm	75
8 AWG copper @ 100 ft	0.0778 ohm	100
8 AWG copper @ 150 ft	0.1167 ohm	150
8 AWG copper @ 200 ft	0.1556 ohm	200
8 AWG copper @ 300 ft	0.2334 ohm	300
8 AWG copper @ 500 ft	0.389 ohm	500
8 AWG copper @ 750 ft	0.5835 ohm	750
8 AWG copper @ 1000 ft	0.778 ohm	1,000
6 AWG copper @ 25 ft	0.0123 ohm	25
6 AWG copper @ 50 ft	0.0246 ohm	50
6 AWG copper @ 75 ft	0.0368 ohm	75
6 AWG copper @ 100 ft	0.0491 ohm	100
6 AWG copper @ 150 ft	0.0737 ohm	150
6 AWG copper @ 200 ft	0.0982 ohm	200
6 AWG copper @ 300 ft	0.1473 ohm	300
6 AWG copper @ 500 ft	0.2455 ohm	500
6 AWG copper @ 750 ft	0.3683 ohm	750
6 AWG copper @ 1000 ft	0.491 ohm	1,000
4 AWG copper @ 25 ft	0.0077 ohm	25
4 AWG copper @ 50 ft	0.0154 ohm	50
4 AWG copper @ 75 ft	0.0231 ohm	75
4 AWG copper @ 100 ft	0.0308 ohm	100
4 AWG copper @ 150 ft	0.0462 ohm	150
4 AWG copper @ 200 ft	0.0616 ohm	200
4 AWG copper @ 300 ft	0.0924 ohm	300
4 AWG copper @ 500 ft	0.154 ohm	500
4 AWG copper @ 750 ft	0.231 ohm	750
4 AWG copper @ 1000 ft	0.308 ohm	1,000

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