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EV Charger Wire Size Calculator

Voltage drop on long charger runs.

Inputs

Inputs and assumptions

32A, 40A, or 48A.

Panel to charger.

8 AWG 16510, 6 AWG 26240, 4 AWG 41740, 3 AWG 52620, 2 AWG 66360 CM. Keep drop under 3% branch / 5% total per NEC 210.19(A) informational note.

Level 2 voltage.

DC resistance per NEC Chapter 9 Table 8. Use 21.2 for aluminum.

Result

Drop percent
—
Voltage drop
—

What to check

  • Run length
  • Charger current
  • Wire circular mils

Related calculators

Screening tool. EV charging is a continuous load per NEC 625.41 (size at 125%). Verify wire, breaker, and service sizing against the NEC as adopted locally and the AHJ before acting.

Saved calculations

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