OhmCalc
Calculate electrical values

I = V/R · I = P/V · I = √(P/R)

Calculate electrical current in amps or milliamps

Solve current from voltage and resistance, voltage and power, or resistance and power.

Private browser calculation

Choose the two known quantities

Values stay on this page

Known pair

Voltage + resistance

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

Voltage

Resistance

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