Wire Resistance Calculator & Table

 

 

Quick Calculator

Wire Length (feet)

Gauge (AWG)

Wire Resistance:  ___ ohms (Results are rounded to the nearest milliohm.)

 

Advanced Calculator

Diagram of calc model

Step 1: Find the Wire Resistances

Units of Measure
All lengths in
All resistance values in ohms
All wire gauges are AWG
All wire is copper
Your Fixturing
The wire from tester to:
Point A: Length Gauge ___ ohms
Point B: Length Gauge ___ ohms
Contact resistance from fixture to DUT:
At Point A: ohms ___ ohms
At Point B: ohms ___ ohms
Your Device Under Test
Wire in DUT:
Length Gauge ___ ohms
Wire Resistance Results

Expected resistance of:

A 2-wire measurement: ___ ohms
A 4-wire measurement (points combine at A and B): ___ ohms
4-wire measurement (points combine on DUT):

___ ohms

Step 2: Factor in the Variations

Variations
Wire Resistance %
Wire Length %
Max Temperature ° ___%
°F or °C
Accuracy of Tester
  •   Percent of reading %
  •   Fixed error ohms
Recommended Thresholds

Highest Expected Resistance for 2-wire: ___ ohms
Highest Expected Resistance for 4-wire (points combine at A and B): ___ ohms
Highest Expected Resistance for true 4-wire (points combine on DUT): ___ ohms

Resistance Table

Wire Table for International Standards Annealed Copper American Wire Gauge (B.&S.) (Table modified to display shorter lengths and typical uses)

Typical Uses Wire Gauge # Diameter in Mils. Area Diameter Ohms Per 100 ft. Ohms Per 10 ft. Ohms Per foot
House Wiring 12 80.808 6,529.90 0.15880 0.015880 0.001588
  13 71.901 5,178.40 0.20030 0.020030 0.002003
Heavy Power Wire 14 64.084 4,106.80 0.25250 0.025250 0.002525
  15 57.068 3,256.70 0.31840 0.03184 0.00318
Heavy Hook-up 16 50.820 2,582.90 0.40160 0.04016 0.00402
  17 45.257 2,048.20 0.50640 0.05064 0.00506
Std. Computer
Power Cables
18 40.303 1,624.30 0.63850 0.06385 0.00639
  19 35.890 1,288.10 0.80510 0.08051 0.00805
Std. Hook-up 20 31.961 1,021.50 1.01500 0.10150 0.01015
  21 28.462 810.10 1.28000 0.12800 0.01280
Typ. Interface 22 25.347 642.40 1.61400 0.16140 0.01614
  23 22.571 509.45 2.03600 0.20360 0.02036
Std. Hook-up 24 20.100 404.01 2.56700 0.25670 0.02567
  25 17.900 320.40 3.23700 0.32370 0.03237
Heavy .050
Ribbon Cable
26 15.940 254.10 4.08100 0.40810 0.04081
  27 14.195 201.50 5.14700 0.51470 0.05147
Std. .050 
Ribbon Cable
28 12.641 159.79 6.49000 0.64900 0.06490
  29 11.257 126.72 8.18300 0.81830 0.08183
Std. .025 pitch 
Ribbon Cable / 
Solid Wire for
Wire Wrap
30 10.025 100.50 10.32000 1.03200 0.10320

For pullout force information see our Pullout Force Comparison.