PrismKitCalculatorsEnergy Cost CalculatorEnergy Cost CalculatorRuns in your browserLocalCopy linkMarkdownWork out the electricity use and running cost of one or more devices per day, month and year.Compound Interest CalculatorProject how savings grow with compound interest and regular contributions, year by year.Ohm's Law CalculatorEnter any two of voltage, current, resistance and power to get the other two, with SI prefixes like 4.7k and 20m.