Wire Gauge Amperage Chart (AWG to Amps) | HandySkook
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 Canadian Electrical Code (CEC) or a licensed electrician.
Try the wire gauge calculator and voltage drop calculator. Shop wire & cable, breakers & outlets & switches.
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.
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