About Ohm's Law Calculator
Solve Ohm's law relationships for voltage, current, resistance, and power from any two known values.
Conversions run locally in your browser, so you can change inputs and units instantly without uploading values to a server.
Frequently Asked Questions
Enter any two of voltage, current, resistance, or power. The calculator solves the remaining values where the relationships are valid.
This hub uses classic Ohm's law relationships. For three-phase power and current, use the dedicated kilowatt and watts converters.