Joules to Calories Converter
Convert joules (J) to calories (cal) as you type — 1 J = 0.239006 cal. Switch units, change the precision or copy the result.
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How to use this tool
Steps for using the Unit Converter.
- Enter a value in From — joules are already selected.
- The result in calories appears instantly. Change either unit to convert to anything else in energy.
- Use the swap button for the reverse conversion, and set the decimal places you need.
- Turn on Show formula to see the calculation, then copy or share the result.
Example
1 J to cal
1 Jcal = 1 ÷ 4.184 = 0.239006 calCommon use cases
- Food energy on nutrition labels (kJ and kcal).
- Electricity use and battery capacity in Wh and kWh.
- Heating and cooling loads in BTU.
Joules to Calories conversion table
| Joule (J) | Calorie (cal) |
|---|---|
| 0.1 J | 0.023901 cal |
| 0.5 J | 0.119503 cal |
| 1 J | 0.239006 cal |
| 2 J | 0.478011 cal |
| 3 J | 0.717017 cal |
| 4 J | 0.956023 cal |
| 5 J | 1.195029 cal |
| 10 J | 2.390057 cal |
| 15 J | 3.585086 cal |
| Joule (J) | Calorie (cal) |
|---|---|
| 20 J | 4.780115 cal |
| 25 J | 5.975143 cal |
| 50 J | 11.950287 cal |
| 75 J | 17.92543 cal |
| 100 J | 23.900574 cal |
| 250 J | 59.751434 cal |
| 500 J | 119.502868 cal |
| 1,000 J | 239.005736 cal |
Values rounded to 6 decimal places.
Related conversions
The units
- Joule (J)
- 1 N·m = 1 W·s, the SI unit of energy. Part of the SI system.
- Calorie (cal)
- Thermochemical calorie, exactly 4.184 J.
How to convert joules to calories
Physics and chemistry use joules; this page converts to the small (thermochemical) calorie of 4.184 J. Food “Calories” are kilocalories — see kilojoules to calories.
To convert joules to calories, use cal = J ÷ 4.184. One joule equals 0.239006 calories, and one calorie equals 4.184 joules.
Joule (J): 1 N·m = 1 W·s, the SI unit of energy. Calorie (cal): Thermochemical calorie, exactly 4.184 J.
All energy units are on the energy converter.
Limitations
- Results are rounded to the decimal places you choose; the calculation itself keeps full precision.
Frequently asked questions
How many calories are in a joule?
1 J = 0.239006 cal. Multiply joules by 0.2390057361 (or use cal = J ÷ 4.184).
How do I convert joules to calories?
Use cal = J ÷ 4.184. For example, 1 J = 0.239 cal and 10 J = 2.3901 cal.
Is a food Calorie the same as a calorie?
No. A food Calorie (capital C) is a kilocalorie, 1,000 small calories or 4.184 kJ.
How many joules are in a kWh?
3,600,000 J (3.6 MJ).