Watts to Amps Calculator

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DC and single-phase AC use amps = watts ÷ volts; three phase adds a √3 or 3 factor.
The electrical power the device consumes, in watts, kilowatts or milliwatts.
The supply voltage, e.g. 120 V or 240 V mains, 400 V three phase, or 12 V for a car battery.
Currency
Current
10A

I = P ÷ (factors × V)

Current10,000mA
10 A
Up to a 15 A circuit<1515-20 A circuit15-2020-30 A circuit20-30Heavy 30 A+ circuit30+

On this DC circuit the load draws 10.00 A.

  • For DC the rule is simply amps = watts ÷ volts (I = P ÷ V).
  • Higher voltage means lower current for the same power, which is why long lines run at high voltage.
  • Turn on the running-cost estimate to see what the load costs per day and per year.

Next stepCompare this current to your circuit breaker and wire rating to be sure the load is within safe limits.

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