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ElecToolsHQ

Electrical Power Calculator

Calculate power, voltage, or current using P = V × I. Enter any two values to find the third.

Formula

P = V × I

P
Power, in watts
V
Voltage, in volts
I
Current, in amps

What this calculator does

Solves for power, voltage, or current when the other two are known. Enter exactly two values.

Use cases

  • Find a load's power rating from its voltage and current
  • Check the current draw expected for a known power and voltage
  • Verify a nameplate power rating against measured voltage and current

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