Ohm's Law Calculator

V = I × R. Leave one blank.

Updated Nov 12, 2026Tested with worked examplesHow we build tools

Voltage (V)

Current (A)

Resistance (Ω)

Ohm's Law Calculator by AIPreciseTools · Open the full calculator ↗

Ohm's law

Voltage (volts) = Current (amps) × Resistance (ohms). Power (watts) = Voltage × Current.

Frequently asked questions

What if I leave one blank?

The calculator solves for the missing value from the other two.

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