Electricity Cost Calculator
Cost to run appliances.
Open →
Energy
Watts to Amps Calculator
Convert watts to amps from the voltage and power factor.
1 for resistive/DC; ~0.8 for motors
Current
—
Amps drawn.
| Amps | — |
|---|---|
| Voltage | — |
| Power factor | — |
| Formula | — |
Show our math
Enter your figures above to see the step-by-step working.
Everything computed client-sideEverything computed client-side — nothing leaves this page
How the Watts to Amps Calculator Works
Power, voltage and current are linked by P = V × I, so current in amps equals power in watts divided by voltage. For AC circuits with motors or electronics, divide also by the power factor (how efficiently the current does work) — 1 for purely resistive loads like heaters, and around 0.8 for many motors. This calculator applies both.
It’s handy for sizing wire, breakers and extension cords: knowing the amp draw tells you whether a circuit can handle a device. A 1,200 W appliance on 120 V pulls 10 amps.
amps = watts ÷ (volts × power factor)
Frequently Asked Questions
How do I convert watts to amps?
Divide the watts by the voltage (and by the power factor for AC motors). 1,200 watts at 120 volts is 10 amps.
What is power factor?
A number from 0 to 1 showing how effectively AC current does work. Resistive loads are 1; motors and electronics are lower, raising the current draw.
Why does amp draw matter?
It determines the wire gauge, breaker and cord you need. Exceeding a circuit’s amp rating trips the breaker or overheats the wiring.
More From The Desk
Same plain method, different figuresAmps to Watts Calculator
Current to watts.
Open →Watts to kWh Calculator
Watts to energy used.
Open →Solar Panel Calculator
Solar system sizing.
Open →