Electrical Power Calculator
Solve for any variable: P = V × I, P = I²R, P = V²/R. Select what to solve for, enter any two known values.
Power
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Watts
Voltage
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Volts
Current
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Amps
Resistance
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Ohms
How this was calculated
P = V × I — Power equals voltage times current.
P = I² × R — Power equals current squared times resistance.
P = V² / R — Power equals voltage squared divided by resistance.
Enter any two known values and the calculator solves for the other two.
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The power wheel relates four fundamental electrical quantities: power (P in watts), voltage (V in volts), current (I in amps), and resistance (R in ohms). Given any two, the other two are fully determined.
Common applications: sizing breakers, checking wire ampacity, calculating heat dissipation in resistive loads, and verifying motor nameplate ratings.
All calculations run in your browser. Built by Groundwork Analytics.