Wire Gauge Amperage Chart (AWG to Amps) | TaskHolt

Wire Gauge Amperage Chart (AWG to Amps)

A complete copper and aluminum wire gauge (AWG) chart with ampacity, typical breaker size and common household uses — a quick reference for sizing electrical wire.

Copper wire ampacity (AWG)

Wire (AWG) Ampacity (60°C) Typical breaker Common use
18 AWG 7 A Low-voltage, lamp cord
16 AWG 10 A Extension cords, fixtures
14 AWG 15 A 15 A Lights, general outlets
12 AWG 20 A 20 A Kitchen/bath outlets, microwave
10 AWG 30 A 30 A Dryer, water heater, A/C
8 AWG 40 A 40 A Range, EV charger
6 AWG 55 A 50 A Large A/C, subpanel feeder
4 AWG 70 A 60-70 A Subpanel, large load
2 AWG 95 A 90 A Service / subpanel
1/0 AWG 125 A 125 A Main feeder

Aluminum wire ampacity (AWG)

Aluminum carries less current than copper, so size up about one gauge.

Wire (AWG) Ampacity (60°C) Equivalent copper
12 AWG 15 A 14 AWG Cu
10 AWG 25 A 12 AWG Cu
8 AWG 30 A 10 AWG Cu
6 AWG 40 A 8 AWG Cu
4 AWG 55 A 6 AWG Cu
2 AWG 75 A 4 AWG Cu
1/0 AWG 100 A 2 AWG Cu
Smaller AWG numbers = thicker wire = more current. For runs over ~100 ft, add a gauge for voltage drop. This chart is a reference, not a substitute for the NEC or a licensed electrician.

Frequently asked questions

What wire gauge do I need for 20 amps?

Use 12 AWG copper for a 20-amp circuit. 14 AWG is only rated for 15 amps.

Is aluminum or copper wire better?

Copper carries more current per gauge and is more common in branch circuits. Aluminum is lighter and cheaper for large feeders but must be sized up about one gauge and use compatible (AL-rated) terminals.

Does wire length matter?

Yes. On long runs, voltage drop can require a thicker wire than the ampacity chart alone suggests — keep drop under 3% on branch circuits.