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EV Charger Circuit Sizer

Breaker size for 32A, 40A, and 48A home chargers.

Inputs

Inputs and assumptions

Nameplate kW. 7.68 = 32A -> 40A circuit; 9.6 = 40A -> 50A; 11.52 = 48A -> 60A.

US home Level 2 is 240V.

EV charging is a continuous load per NEC 625.41: size at 125%. Noncontinuous uses 100%.

Result

Next standard breaker size
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Charger current
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Required ampacity (125% if continuous)
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What to check

  • Charger kW
  • Circuit voltage

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.

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