Calories to Joules Converter
1 calorie = 4.184 joules.
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Result
1 calorie =
4.184 J
1 cal × 4.184 = 4.184 J
1 kcal = 4.184 kJ · 1 kWh = 3,600 kJ
The working
- 1. Convert 1 cal to joules: 1 × 4.184 = 4.184.
- 2. Convert to J: 4.184 ÷ 1 = 4.184.
1 cal in every unit
Joules4.184 J
Kilojoules0.004184 kJ
Megajoules4.184e-6 MJ
Calories (thermochemical)1 cal
Kilocalories (food Calories)0.001 kcal
Watt-hours0.00116222 Wh
Kilowatt-hours1.16222e-6 kWh
British thermal units0.00396567 BTU
Electronvolts2.61145e19 eV
Foot-pounds3.08596 ft·lbf
Everyday energy
- A banana
- ≈ 400 kJ (95 kcal)
- Boiling a kettle
- ≈ 0.1 kWh
- A litre of petrol
- ≈ 34 MJ
Conversion table
Calories to Joules
| Calories | Joules |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 4 | 16.736 |
| 5 | 20.92 |
| 6 | 25.104 |
| 7 | 29.288 |
| 8 | 33.472 |
| 9 | 37.656 |
| 10 | 41.84 |
| 15 | 62.76 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
Joules to Calories
| Joules | Calories |
|---|---|
| 1 | 0.23901 |
| 2 | 0.47801 |
| 3 | 0.71702 |
| 4 | 0.95602 |
| 5 | 1.195 |
| 6 | 1.434 |
| 7 | 1.673 |
| 8 | 1.912 |
| 9 | 2.1511 |
| 10 | 2.3901 |
| 15 | 3.5851 |
| 20 | 4.7801 |
| 25 | 5.9751 |
| 50 | 11.95 |
| 100 | 23.901 |
Formula and worked example
joules = calories × 4.184.
Convert 100 calories to joules: 100 × 4.184 = 418.4 J.
When you need this
Converting heat quantities from calories into joules, the SI unit used in physics and engineering. One calorie is 4.184 J.
Questions people ask
How many joules are in a calorie?
One calorie is 4.184 joules.
How do I convert calories to joules?
Multiply the number of calories by 4.184.
What is 10 cal in J?
10 calories is 41.84 joules.
How do I convert joules back to calories?
Multiply by 0.23900574: one joule is 0.23900574 calories.
Related conversions
How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it. Source: NIST Special Publication 811, Guide for the Use of the International System of Units.
Spotted a mistake? Tell us and we'll check it. How we check our calculators