Ohm's Law Calculator

Enter any two values to calculate the other two instantly.

Voltage (V)

Current (A)

Resistance (Ω)

Power (W)

Enter any 2 of the 4 values above

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Enter any 2 of the 4 values above

Key Formulas

V = I × R

I = V / R

R = V / I

P = V × I

P = I² × R

P = V² / R