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Ohm's Law Calculator

Calculate voltage (V), current (A), resistance (Ω), and power (W).

Ohm's Law Calculator

Choose two known quantities and enter their values to calculate the others.

Known quantities

V
A

Results

Choose two known quantities and enter their values to calculate the others.

About Ohm's Law

Ohm's law describes the relationship between voltage (V), current (I), resistance (R), and power (P). The key equations are V = I × R, P = V × I, P = I² × R, and P = V² ÷ R. This calculator computes the remaining quantities from any two known values.