OhmCalc
Calculate electrical values

Voltage · current · resistance · power

Ohm's law and electrical power calculator

Enter any two known values and solve the ideal resistive relationship locally with exact SI-prefix conversion.

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.