What is the Watts to Amps Calculator?
Convert watts to amps for DC and single-phase AC circuits.
Enter power, voltage and power factor and the Watts to Amps Calculator returns current (AC single phase), current (DC) and current (AC three phase, line voltage). Results update as you type, and nothing you enter leaves your device.
How it is calculated
I = P ÷ (V × PF)
Three phase: I = P ÷ (√3 × V × PF)
How to use it
- Enter power in W.
- Enter voltage in V.
- Enter power factor.
- Read current (AC single phase) in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Watts to Amps Calculator use?
It uses: I = P ÷ (V × PF); Three phase: I = P ÷ (√3 × V × PF).
What do I need to use the Watts to Amps Calculator?
You need power, voltage and power factor. Sensible starting values are filled in so you can see how it works straight away.
Is the Watts to Amps Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.