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Wire Tables — Master Hub

One combined quick table below, and every specialized reference a click away.

SizecmilΩ/kft CuΩ/kft AlCu 75°CCu 90°CAl 75°C
14 AWG4,1103.075.062025
12 AWG6,5301.933.18253020
10 AWG10,3801.212354030
8 AWG16,5100.7641.26505540
6 AWG26,2400.4910.808657550
4 AWG41,7400.3080.508859565
3 AWG52,6200.2450.40310011075
2 AWG66,3600.1940.31911513090
1 AWG83,6900.1540.253130145100
1/0 AWG105,6000.1220.201150170120
2/0 AWG133,1000.09670.159175195135
3/0 AWG167,8000.07660.126200225155
4/0 AWG211,6000.06080.1230260180
250 kcmil250,0000.05150.0847255290205
300 kcmil300,0000.04290.0707285320230
350 kcmil350,0000.03670.0605310350250
400 kcmil400,0000.03210.0529335380270
500 kcmil500,0000.02580.0424380430310

All reference tables

NEC Ch.9 Table 8 — annotated

DC resistance with the footnotes that matter.

Ampacity — Table 310.16

60/75/90 °C with the interactive size finder.

AWG Chart

Dimensions, Ω/kft and Ω/km, every size.

Voltage Drop Distance Charts

Printable + PDF download.

K-Factor

12.9 / 21.2 derived, and its limits.

Copper vs Aluminum

The 61% rule, terminations, economics.

AWG ⇄ mm² Converter

Cross to metric and back.

Metric Cable Sizes

1.5–120 mm² with max-run tables.

Formulas

1Ø, 3Ø, DC, resistance and K methods.

Glossary

45 terms, plainly defined.

Built & maintained by Murugan Vellaichamy · Every calculation verified against NEC Chapter 9 Table 8 & Table 310.16 published values · Informational reference — not engineering advice