EV charging tool
EV Amps and kW Calculator
Convert EV charging current and power from voltage for Level 1 and Level 2 planning notes.
Convert EV Amps and kW
Convert EV charging current and kilowatts from circuit voltage; for example, 32 A at 240 V is 7.68 kW before charger and vehicle losses.
Result
kW
7.68 kW
Result notes. Keep inputs, assumptions, and result together before using this value in project records.
Keep the entered values, assumptions, and result together when adding this calculation to job notes or submittal records. Final installation choices should align with the applicable code edition, equipment listing, manufacturer instructions, local amendments, and AHJ requirements.
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Use this watts to amps chart: 1,500W at 120V = 12.5A; 1,500W at 240V = 6.3A; 9 kW at 240V = 37.5A.
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Watts and Amps Calculator
Enter watts or amps with voltage, phase, and power factor to convert watts to amps or amps to watts while keeping the circuit context with the result.
kW and Amps Calculator
Convert kW or amps with voltage, phase, and power factor; for example, 15 kW at 480 V three-phase and 0.90 PF is about 20.1 A.
Formula and field context
Convert EV charging current and power from voltage for Level 1 and Level 2 planning notes.
Formula context
EV Charger Wire Size Chart
EV charger wire size depends on the EVSE output setting, continuous-load treatment, voltage, circuit length, conductor material, terminal rating, breaker type, service capacity, load management, manufacturer instructions, adopted NEC rules, and AHJ review. Use the calculator result as a planning record before finalizing the circuit.
Formula
Planning circuit current screen = EVSE output current x continuous-load planning factor when that path applies.Variables to keep with the result
- EVSE output current is the charger nameplate current or configured maximum output setting.
- Planning factor keeps long-duration charging visible in the worksheet before conductor and breaker review.
- Wire size still requires ampacity, terminal rating, voltage drop, breaker compatibility, and service-load review.
Formula and voltage basis
For Level 1 and Level 2 AC charging, kW equals volts times amps divided by 1,000. The reverse calculation multiplies kW by 1,000 and divides by volts. A 32 A charger at 240 V is 7.68 kW, and a 48 A charger at 240 V is 11.52 kW before charging losses and vehicle charge-curve behavior.
U.S. field context
EV charging discussions often move between breaker size, continuous load, charger output, service capacity, and vehicle energy. This calculation keeps voltage, current, and kW aligned, but it does not approve conductor size, breaker size, load calculation, or service capacity.
When to use the full calculator
Use the EV charging-power calculator for battery size, state of charge, charging time, efficiency, and cost. Use residential-load, service-size, wire-size, and breaker calculators when installing or evaluating an EV branch circuit.