Energy Converter
Convert joules, calories, kilocalories, kWh, BTU, electronvolts and therms.
How to use
- 1Enter an amount of energy and its unit.
- 2Choose the unit to convert to.
How it's calculated
Converts through joules. 1 kWh = 3.6 MJ; 1 (thermochemical) calorie = 4.184 J; 1 BTU (IT) = 1,055.056 J.
Frequently asked questions
Is a food Calorie the same as a calorie?
No — a food 'Calorie' is a kilocalorie (1,000 calories), about 4.184 kJ.
How many BTU are in a kilowatt-hour?
About 3,412 BTU, so one BTU is roughly 0.000293 kWh.
What is a therm?
100,000 BTU, about 29.3 kWh. It is common on US and UK gas bills.