Energy Converter
Joules, calories, kcal, kWh and BTU in one table. Convert energy units instantly: joules, kilojoules, calories, kilocalories (food calories), watt-hours, kilowatt-hours and BTU. Free energy unit converter.
About the Energy Converter
Physics homework uses joules, food labels use kilocalories, electricity bills use kilowatt-hours, and air-conditioner specs use BTU — four dialects of the same quantity. This converter switches between them all from one input, with the food-label convention handled correctly: one "Calorie" on a label is one kilocalorie, 4184 joules. Also includes watt-hours for battery capacity comparisons.
How to use the Energy Converter
- Enter the energy value.
- Select its unit.
- Read all other units instantly.
- Note kcal vs cal when reading labels.
Key features
- Joules, kJ, calories and kilocalories
- Wh and kWh for electricity
- BTU for heating and cooling
- Correct food-calorie (kcal) handling
Is a food calorie the same as a calorie?
How many joules in one kWh?
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