What is the difference between cal and kcal?
One kilocalorie equals 1,000 calories. Food labels commonly call a kilocalorie a Calorie.
Energy Converter
Convert joules, calories, watt-hours, kilowatt-hours, and BTU.
Calculations happen locally. We do not send your values to our server.
Example
1 kWh equals 3.6 million joules or about 3,412.14 BTU.
Calculation method
Each value is normalized to joules using fixed conversion factors before conversion to the target unit.
Important notes
Food calories are normally kilocalories; the “cal” option here is the small thermochemical calorie.
Frequently asked questions
How many joules are in one watt-hour?
One watt-hour equals 3,600 joules.
Is kW the same as kWh?
No. kW measures power; kWh measures energy over time.