Electrical
Watts to Amps Calculator
Convert watts to amps for DC, single-phase and three-phase circuits.
Result
A planning estimate, not a code calculation. Conductor sizing, overcurrent protection and load calculations are governed by the NEC as adopted and amended where you are, and by the listing of the equipment involved. Have the design confirmed by a licensed electrician and inspected.
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About this calculator
Why does my appliance draw more than this?
Start-up current. Motors and compressors pull several times their running current for a moment, which is why breaker types and motor rules differ from simple resistive loads.
Does voltage matter that much?
A great deal. The same wattage at 240 V draws half the current it does at 120 V, which is why large appliances are wired at the higher voltage.
The formula
single phase: A = W / (V x PF); three phase: A = W / (1.732 x V x PF)
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Estimating is the easy part
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