Watts to Amps Calculator

Convert watts to amps at any voltage (120 V, 240 V, 12 V). Instant answer with formula and circuit-breaker guidance.

—

Formula

Amps = Watts ÷ Volts (A = W / V) — for DC and purely resistive AC loads. For reactive AC loads divide by (Volts × Power Factor); PF ≈ 1 for heaters and incandescent bulbs, 0.6–0.9 for motors and electronics

Examples

InputResult
1500 W at 120 V12.5 A
1500 W at 240 V6.25 A
1500 W at 12 V125 A

Frequently Asked Questions

How do you convert watts to amps?

Divide watts by volts: A = W / V. At 120 V, 1500 W draws 12.5 A; at 240 V the same heater draws only 6.25 A because the voltage is doubled.

Why does the result differ at 120 V vs 240 V?

The same power at higher voltage needs less current. US outlets are 120 V (15–20 A circuits); US dryers, ovens and EU outlets are 230–240 V.

What about power factor?

For AC loads with motors or electronics, real amps = watts ÷ (volts × PF). A 1500 W motor at PF 0.8 on 120 V draws 1500 ÷ 96 = 15.6 A, not 12.5 A.

Related Calculators

1500 Watts to Amps1000 Watts to Amps1800 Watts to Amps1200 Watts to Amps700 Watts to Amps250 Watts to Amps120 Watts to Amps100 Watts to AmpsAmps to Watts CalculatorVA to Watts Calculator