Tool library
Energy & Power Conversion Tools
One connected toolkit for every watt, joule, kilowatt-hour, amp, and calorie conversion — free, instant, and private in your browser.
Choose a converter
Each tool runs entirely in your browser and cross-links to the rest of the cluster.
- Watts to JoulesThe full power × time energy calculator with three modes.Energy
- kWh to JoulesTurn the kWh figure on your electricity bill into joules — 1 kWh = 3,600,000 J.Energy
- Joules to kWhConvert a joule or megajoule figure into billable kilowatt-hours — divide by 3,600,000.Energy
- Watts to AmpsCalculate amps from watts and volts for DC and AC circuits — I = P ÷ V.Power
- Joules to CaloriesConvert joules into calories and food Calories (kcal) — 1 cal = 4.184 J.Energy