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Home › Calculators › Electrical Tools › Electrical Power Calculator

Electrical Power Calculator

Calculate electrical power (Watts) using Voltage and Current.
Input Values

Fill any 2 fields — leave the others blank to calculate them.

Power
W
P
Voltage
V
V
Current
A
I
Resistance
Ω
R
Power Formulas
When V and I are known P = V × I
When I and R are known P = I² × R
When V and R are known P = V² / R

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