OhmCalc
Calculate electrical values

V = I×R · V = P/I · V = √(P×R)

Calculate voltage from current, resistance, or power

Choose the known pair and calculate volts without mixing milli-, base-, and kilo-unit scales.

Private browser calculation

Choose the two known quantities

Values stay on this page

Known pair

Current + resistance

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

Current

Resistance

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