From standard IEC 60228 Ed.3.0 and UL 1581 (up to 2000 kcmil) and ASTM B8-11/B231-04 and ICEA S-94-649-2000 (2500 kcmil and above).

The tabulated standard DC resistance values for cable conductors at 20°C are in Ω/km. For calculation, the value is divided by 1000.

Symbol
$R_{\mathrm{co}}$
Unit
Ω/m
Formulae
$\frac{1000000000 \rho_{\mathrm{c}}}{A_{\mathrm{c}}}$Ω/km
$\frac{1000000 \rho_{\mathrm{c}}}{A_{\mathrm{c}}}$Ω/m
Related
$A_{\mathrm{c}}$
$c_{\mathrm{constr}}$
$M_{\mathrm{c}}$
$n_{\mathrm{cw}}$
$\rho_{\mathrm{c}}$
Used in
$R_{\mathrm{0}}$
$R_{\mathrm{c}}$
Choices
Size
IEC
mm2

UL
AWG

Area
mm2
solid
copper
plain


coated

alu
both
stranded
copper
plain


coated

alu
both
flexible
copper
plain


coated
class 6
copper
plain


coated
26 AWG0.128138143225140150230
24 AWG0.20585.989.314187.694.2144
22 AWG0.32454.356.488.955.459.490.9
0.5 mm²0.536.036.757.4736.036.757.4739.040.139.040.1
20 AWG0.51933.935.255.434.636.757.1
0.75 mm²0.7524.524.838.3124.524.838.3126.026.726.026.7
18 AWG0.82321.422.235.121.823.235.8
1.0 mm²1.018.118.228.7418.118.228.7419.520.019.520.0
16 AWG1.3113.514.022.013.714.622.5
1.5 mm²1.512.112.219.1612.112.219.1613.313.713.313.7
14 AWG2.088.458.7813.88.628.9614.18.79.248.619.25
2.5 mm²2.57.417.5611.497.417.5611.497.988.217.988.21
12 AWG3.315.315.538.715.435.648.885.485.815.535.94
4 mm²4.04.614.77.184.614.77.184.955.094.955.09
10 AWG5.2613.3433.4765.4793.4093.5465.5893.453.663.483.73
6 mm²6.03.083.114.793.083.114.793.33.393.33.39
8 AWG8.3672.1022.1633.4462.1442.233.5152.182.332.182.35
10 mm²10.01.831.843.081.831.843.081.911.951.911.95
6 AWG13.31.3231.3632.1681.3481.4032.2111.381.461.391.49
16 mm²16.01.151.161.911.150.161.911.211.241.211.24
4 AWG21.150.83150.85591.3630.84810.8821.390.8650.9180.8730.937
25 mm²25.00.7271.20.7270.7341.20.780.7950.780.795
3 AWG26.670.65950.67881.0810.67270.69961.1030.6860.7280.6990.744
2 AWG33.620.52310.53840.85740.53350.55480.87450.5470.580.5540.595
35 mm²35.00.5240.8680.5240.5290.8680.5540.5650.5540.565
1 AWG42.410.41460.42680.67980.4230.43980.69340.4340.460.440.472
50 mm²50.00.3870.6410.3870.3910.6410.3860.3930.3860.393
1/0 AWG53.490.32870.33670.5390.33540.34870.54980.3440.3570.3490.374
2/0 AWG67.430.26080.2670.42750.2660.27660.43610.2720.2840.2760.3
70 mm²70.00.2680.4430.2680.270.4430.2720.2770.2720.277
3/0 AWG85.010.20690.21190.33920.2110.21940.34590.2160.2240.2210.238
95 mm²95.00.1930.320.1930.1950.320.2060.210.2060.21
4/0 AWG107.20.1640.1680.26890.16730.17220.27430.1720.180.1750.189
120 mm²120.00.1530.2530.1530.1540.2530.1610.1640.1610.164
250 kcmil127.00.14160.14730.23220.1460.1250.1490.159
150 mm²150.00.1240.2060.1240.1260.2060.1290.1320.1290.132
300 kcmil152.00.1180.12270.19350.1210.1260.1230.133
350 kcmil177.00.10110.10520.16590.1040.1080.1060.114
185 mm²185.00.1010.1640.09910.10.1640.1060.1080.1060.108
400 kcmil203.00.088510.091090.1450.09110.09480.09280.0997
240 mm²240.00.07750.1250.07540.07620.1250.08010.08170.08010.0817
500 kcmil253.00.07080.072870.11610.07290.07580.07430.0798
300 mm²300.00.0620.10.06010.06070.10.06410.06540.06410.0654
600 kcmil304.00.0590.061350.096730.06130.06380.06190.0664
700 kcmil355.00.050570.052050.082910.05250.05470.0530.0569
750 kcmil380.00.047210.048580.077380.04910.0510.04950.0531
400 mm²400.00.04650.07780.0470.04750.07780.04860.0495
800 kcmil405.00.044250.045540.072510.0460.04780.04640.0499
900 kcmil456.00.039330.040480.064480.04090.04250.04130.0443
500 mm²500.00.06050.03660.03690.06050.03840.0391
1000 kcmil507.00.03540.036430.058040.03680.03820.03710.0399
630 mm²630.00.04690.02830.02860.04690.02870.0292
1250 kcmil633.00.028330.029150.046430.02950.0306
1500 kcmil760.00.02360.024290.038690.02450.0255
800 mm²800.00.03670.02210.02240.0367
1750 kcmil887.00.020230.020820.033160.0210.0218
1000 mm²1000.00.02910.01760.01770.0291
2000 kcmil1013.00.01770.018220.029020.01840.0192
2250 kcmil1140.00.01560.01560.0255
1200 mm²1200.00.02470.01510.01510.0247
2500 kcmil1270.00.0140.01440.0229
1400 mm²1400.00.01290.01290.0212
2750 kcmil1393.00.01260.01260.0209
3000 kcmil1520.00.01170.0120.0192
1600 mm²1600.00.01130.01130.0186
3500 kcmil1770.00.01010.01040.0166
1800 mm²1800.00.01010.01010.0165
2000 mm²2000.00.0090.0090.0149
4000 kcmil2030.00.00880.00910.0145
4500 kcmil2280.00.00790.00820.013
2500 mm²2500.00.00720.00720.0127
5000 kcmil2530.00.007150.00740.0117
3000 mm²3000.00.00570.00570.01