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Ohm's Law Calculator

Calculate voltage, current, resistance, and power — enter any 2 values to solve for the rest, with auto unit scaling

Ohm's Law

Enter any 2 values, the other 2 are computed

Results

V

Voltage

Input

12.0000 V

12.000 V

I

Current

0.120000 A

120.00 mA

R

Resistance

Input

100.00 Ω

100.00 Ω

P

Power

1.4400 W

1.4400 W

Formulas

V = I × R

Voltage

I = V / R

Current

R = V / I

Resistance

P = V × I

Power

P = I² × R

Power

P = V² / R

Power

Ohm's Law

Ohm's Law states the current through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance: V = I × R. Combined with the power equation P = V × I, knowing any 2 of V, I, R, P lets you derive the other two.

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