I = P / VNo power factor needed for DC circuits.
EV Charging Tool
EV Charger Watts to Amps Calculator
Size the electrical circuit for your home EV charger. Level 2 chargers are 240V single-phase; common sizes are 3.3kW, 7.2kW, 11kW, and 22kW. NEC requires breakers sized at 125% of the continuous charger load.
Conversion direction
Quick voltage presets
Power factor varies by load. Use the equipment value when available.
Calculated result1000 W · 120 V · DC
8.333 A
Formula used
I = P / VCustom voltage is always supported.
Formulas Used
I = P / (V × PF)Single-phase AC — multiply voltage by power factor.
I = P / (√3 × V × PF)Three-phase AC — divide by √3 ≈ 1.732.
Frequently Asked Questions
What circuit does a 7.2kW EV charger need?
7200W / 240V = 30A charger current. Apply 125% NEC rule: 30 x 1.25 = 37.5A. Use a 40A breaker with #8 AWG wire minimum.
How long does a 7.2kW charger add range per hour?
At 7.2kW, a typical EV adds approximately 25-30 miles (40-48 km) of range per hour. Exact figures depend on vehicle efficiency.