## Wire Resistance Calculator & Table

### Quick Calculator

Wire Length (feet)

Gauge (AWG)

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

#### Step 1: Find the Wire Resistances

##### Units of Measure
 All lengths in FeetMeters All resistance values in ohms All wire gauges are AWG All wire is copper
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
 Wire in DUT: Length Gauge 12131415161718192021222324252627282930 ___ 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 FC 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 UsesWire Gauge #Diameter in Mils.Area DiameterOhms 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.

## Scholarship Opportunity

Write an essay response to our question for a chance to receive \$1,000 towards tuition.