Joules to Calories Converter
Convert joules to calories instantly, and calories back to joules. Based on the exact 1 calorie = 4.184 joules definition.
Independently verified for accuracy
Calculator by Toolsloft ↗- Result
- 0.239006 Calories (cal)
- Conversion
- 1 Joules (J) = 0.239006 Calories (cal)
Convert joules to calories, and calories back to joules with the swap button. Useful for physics homework and lab work where energy is quoted in both units. Enter the energy and the answer appears at once.
How this is calculated
This uses the thermochemical calorie, defined as exactly 4.184 joules. Joules are divided by 4.184 to get calories, and calories are multiplied by 4.184 to get joules. Note that food labels use the kilocalorie (1 kcal = 4,184 J), which is one thousand of these calories.
How to use
- Enter the energy in joules.
- Keep the direction on joules to calories, or press Swap units for calories to joules.
- Read the result in calories.
Examples
- One kilojoule of energy:
1000 J = 239.005736 cal - One food-label Calorie:
4184 J = 1000 cal - Calories to joules:
1 cal = 4.184 J
FAQ
- How many joules are in a calorie?
- One thermochemical calorie is exactly 4.184 joules.
- Is this the same calorie shown on food labels?
- No. Food labels use the kilocalorie, which is 1,000 of these small calories, or 4,184 joules.