Calories to Joules Converter
Convert calories and kilocalories to joules and kilojoules using the exact thermochemical calorie.
Independently verified for accuracy
Calculator by Toolsloft ↗- Result
- 4.184 Joules (J)
- Conversion
- 1 Calories (cal) = 4.184 Joules (J)
Convert calories to joules for physics and chemistry work, with kilocalories and kilojoules available for nutrition figures. Choose the source and target units and the answer updates instantly.
How this is calculated
This uses the thermochemical calorie, defined as exactly 4.184 joules. A calorie is multiplied by 4.184 to get joules, and a kilocalorie is 1000 calories, so it equals 4184 joules.
How to use
- Enter the number of calories.
- Pick calories or kilocalories as the source and joules or kilojoules as the target.
- Read the converted energy.
Examples
- One calorie:
1 cal = 4.184 J - Kilocalorie to joules:
1 kcal = 4184 J - Reaction energy:
250 cal = 1046 J
FAQ
- How many joules is one calorie?
- One thermochemical calorie is exactly 4.184 joules. One kilocalorie is 4184 joules.
- Which calorie definition is used?
- The thermochemical calorie of 4.184 joules. It differs very slightly from the International Table calorie of 4.1868 joules.