PrismKitCalculatorsOhm's Law CalculatorOhm's Law CalculatorRuns in your browserLocalCopy linkMarkdownEnter any two of voltage, current, resistance and power to get the other two, with SI prefixes like 4.7k and 20m.Energy Cost CalculatorWork out the electricity use and running cost of one or more devices per day, month and year.Voltage Divider CalculatorWork out a divider's output voltage, current and resistor power, or find R1 for a target voltage with the nearest E12, E24 and E96 values.