OhmCalc
Calculate electrical values

R = V/I · R = V²/P · R = P/I²

Calculate resistance in ohms and kilo-ohms

Find the ideal resistance from voltage and current, voltage and power, or current and power.

Private browser calculation

Choose the two known quantities

Values stay on this page

Known pair

Voltage + current

Enter positive values for the same ideal resistive element. Decimal dots and exact SI prefixes are supported.

Voltage

Current

OhmCalc models one ideal resistive DC relationship. It does not design wiring, choose components, analyze AC or reactive circuits, or certify safety.