Wire Size Calculator

NEC Compliant Tool

Wire Size by Appliance

The wire gauge and breaker for the loads people actually wire — EV chargers, dryers, ranges, hot tubs, mini-splits, well pumps, sub-panels and more, with the NEC details for each.

EV Charging

EV Charger
50A · 240V · 8 AWG Cu
Tesla Wall Connector
60A · 240V · 6 AWG Cu
NEMA 14-50 Outlet
50A · 240V · 8 AWG Cu
30 Amp RV Outlet
30A · 120V · 10 AWG Cu
50 Amp RV Outlet
50A · 240V · 8 AWG Cu

Kitchen

Electric Range
50A · 240V · 8 AWG Cu
Electric Cooktop
40A · 240V · 8 AWG Cu
Electric Wall Oven
30A · 240V · 10 AWG Cu
Dishwasher
20A · 120V · 12 AWG Cu
Garbage Disposal
20A · 120V · 12 AWG Cu
Microwave
20A · 120V · 12 AWG Cu

Laundry & Water Heating

Electric Dryer
30A · 240V · 10 AWG Cu
Electric Water Heater
30A · 240V · 10 AWG Cu
Tankless Water Heater
60–150A total (often multiple circuits) · 8 AWG Cu

Heating & Cooling

Central Air Conditioner
per nameplate MCA · 10 AWG Cu
Heat Pump
per nameplate MCA · 8 AWG Cu
Mini Split
per nameplate (15–30A) · 12 AWG Cu
Electric Furnace
40–100A (per kW) · 6 AWG Cu
Garage Heater
30A · 240V · 10 AWG Cu
Electric Baseboard Heater
20A · 240V · 12 AWG Cu

Outdoor, Pool & Spa

Hot Tub
50A · 240V · 8 AWG Cu
Pool Pump
20A · 240V · 12 AWG Cu
Well Pump
per HP (15–30A typical) · 12 AWG Cu
Sump Pump
15A · 120V · 14 AWG Cu

Workshop & Tools

Welder
30–50A (by duty cycle) · 8 AWG Cu
Air Compressor
30A · 240V · 10 AWG Cu
Table Saw
20A · 120V · 12 AWG Cu

Sub-Panels & Feeders

Sub-Panel
per panel rating (60–125A) · 3 AWG Cu
Detached Garage
60A · 240V · 6 AWG Cu
Shed
30A · 240V · 10 AWG Cu
Generator Inlet
50A · 240V · 8 AWG Cu

Sizes are typical cases from NEC Table 310.16 (75°C). Appliance current varies by model — always confirm the nameplate / MCA before wiring. For reference only.