220 Volt Wire Size Calculator
How it Works
01220/240V Locked
Dryer, range, AC, EV charger, welder, well pump — all 220V appliances.
02Amp Rating
30A dryer, 40A range, 50A EV charger, 60A AC — presets built in.
03Distance
One-way panel to appliance in feet. Voltage drop doubles with distance.
04AWG Size
10 AWG for 30A, 8 AWG for 40-50A, 6 AWG for 60A — distance dependent.
What is a 220 Volt Wire Size Calculator?
A 220 volt wire size calculator — often called a 220V, 240V, or dryer/range wire sizer — tells you the exact AWG you need for a 220/240V branch circuit feeding a heavy appliance or EV charger. In US residential work, \"220V\" is shorthand for 240V split-phase — the two hot legs pulled from opposite sides of a US residential service, giving 240V line-to-line. These circuits power the largest single-appliance loads in a typical home: electric dryer (30A), electric range (40-50A), EV charger (30-60A), AC condenser (20-45A), hot tub (50-60A), and welder or kiln (30-60A).
This tool uses the NEC Table 310.16 ampacity column (75°C) as the starting point, then applies voltage-drop math over the circuit run length to check whether the code-minimum size is enough or needs an upsize. For example, a 30A dryer circuit starts at 10 AWG copper — but if the dryer is 90 feet from the panel, the calculator will recommend 8 AWG to keep drop under 3%.
Inputs: appliance amp rating (or NEC load classification if you know it), run length, conductor material (copper or aluminum — aluminum is common for feeders but avoided for small branch circuits), and insulation rating. Output: minimum AWG, calculated drop %, and breaker size (which should match the circuit ampacity, not the wire). Common scenarios: 30A dryer circuit (10 AWG copper), 40A range circuit (8 AWG copper), 50A EV charger or hot tub (6 AWG copper), 40A AC condenser (8 AWG copper).
This calculator handles standard US residential 220V appliances as well as the NEMA 14-50 EV charging circuits that are becoming the default for home EV installs. For commercial 208V or three-phase 480V applications, use the main wire-size calculator.
"How the 220V Wire Size Calculator Works
220V Wire Size Formula
220V residential uses single-phase split-phase (two hot legs, neutral, ground). Voltage drop formula uses factor-of-2 round trip:
V drop = (2 × K × L × I) ÷ cmil
At 240V, a 3% drop allowance = 7.2V — roughly double the 120V headroom, so longer runs are practical.
Example: 50A EV Charger, 75 ft Run, 240V
50A EV charger (continuous load, so 50A × 1.25 = 62.5A wire sizing per NEC 210.19). 75 ft run. Copper. 3% drop = 7.2V max.
- Min cmils = (2 × 12.9 × 75 × 62.5) ÷ 7.2 ≈ 16,797
- 8 AWG = 16,510 cmils → just short
- 6 AWG = 26,240 cmils → passes with 65A ampacity (good for 50A continuous)
For 50A EV chargers, 6 AWG copper is the standard — gives long-run headroom and future-proofs for potential upgrades.
Common 220V appliances
220V Wire Sizes by Appliance
| Appliance | Amps | Copper AWG | Aluminum AWG |
|---|---|---|---|
| Dryer | 30A | 10 | 8 |
| Range | 40A | 8 | 6 |
| Range / EV charger | 50A | 6 or 8 | 4 or 6 |
| Central AC | 60A | 6 | 4 |
| Hot tub | 50A | 6 | 4 |
| Well pump | 20A | 12 | 10 |
Key Takeaways
220/240V appliance circuits are where most homeowner DIY electrical mistakes happen: the wire is sized for the breaker but not for the long run to the appliance, or aluminum is used on a small circuit where only copper is appropriate. This calculator stops both mistakes by running the drop math on your actual circuit length and letting you compare copper vs aluminum directly.
Two rules every 220V install should follow: the breaker matches the wire ampacity, not the appliance nameplate (an oversized breaker on undersized wire is a fire hazard); and every 220V circuit needs a 2-pole breaker that disconnects both hot legs simultaneously. All 220V appliance circuits are permit-required work — use the calculator to size it, but have a licensed electrician pull the permit, make the connections, and schedule the inspection.
"220V Wire Size FAQs
What size wire for 220V dryer?
What size wire for 220V range?
What size wire for a 50 amp 220V EV charger?
Can I use 10 AWG for 50 amps?
What size wire for 60 amp AC unit?
What size breaker for 220V dryer?
Can I use 120V wire size for 220V?
Is 220V the same as 240V?
What is the NEC rule for continuous loads?
Do I need a neutral for 220V?
Author Spotlight
The ToolsACE Team
Our specialized research and development team at ToolsACE brings together decades of collective experience in financial engineering, data analytics, and high-performance software development.
Disclaimer
Educational reference. 220V appliance wiring requires a 2-pole breaker and dedicated circuit. Always verify with a licensed electrician and pull a permit.