Calories to Joules Converter
1 calorie (cal) equals 4.184 joules (J).
Quick answer
One calorie is exactly 4.184 joules (thermochemical calorie).
- 1 calorie = 4.184 joules
- 1 joule = 0.2390057361 calories
- Formula: J = cal × 4.184
- Quick estimate: multiply by 4.184.
1 calorie = 4.184 joules
How to convert calories to joules
J = cal × 4.184
To convert calories to joules, multiply the number of calories by 4.184.
Example: 42 cal to J
- Start with the value in calories: 42 cal.
- Multiply by 4.184: 42 × 4.184 = 175.728.
- Result: 42 calories = 175.728 joules.
Going the other way, 1 joule = 0.239005736138 calories, so to convert joules back to calories you divide by the same number. See joules to calories.
Where the conversion factor comes from
The thermochemical calorie is exactly 4.184 J. The food Calorie on labels is a kilocalorie (1,000 calories, 4,184 J).
Mental math: cal to J in your head
Multiply by 4 and add 4.6%.
When you need to convert calories to joules
- Chemistry calorimetry.
Common mistakes
- Using food Calories: 1 Calorie = 4,184 J.
Everyday calories in joules
| Example | Calories | Joules |
|---|---|---|
| 1 calorie | 1 cal | 4.184 J |
| Warming 1 L of water by 1 °C | 1,000 cal | 4,184 J |
Calories to joules conversion table
| Calories (cal) | Joules (J) |
|---|---|
| 0.1 cal | 0.4184 J |
| 0.2 cal | 0.8368 J |
| 0.3 cal | 1.2552 J |
| 0.4 cal | 1.6736 J |
| 0.5 cal | 2.092 J |
| 0.6 cal | 2.5104 J |
| 0.7 cal | 2.9288 J |
| 0.8 cal | 3.3472 J |
| 0.9 cal | 3.7656 J |
| 1 cal | 4.184 J |
| 1.5 cal | 6.276 J |
| 2 cal | 8.368 J |
| 2.5 cal | 10.46 J |
| 3 cal | 12.552 J |
| 3.5 cal | 14.644 J |
| 4 cal | 16.736 J |
| 4.5 cal | 18.828 J |
| 5 cal | 20.92 J |
| 6 cal | 25.104 J |
| 7 cal | 29.288 J |
| 7.5 cal | 31.38 J |
| 8 cal | 33.472 J |
| 9 cal | 37.656 J |
| 10 cal | 41.84 J |
| 11 cal | 46.024 J |
| 12 cal | 50.208 J |
| 13 cal | 54.392 J |
| 14 cal | 58.576 J |
| 15 cal | 62.76 J |
| 16 cal | 66.944 J |
| 17 cal | 71.128 J |
| 18 cal | 75.312 J |
| 19 cal | 79.496 J |
| 20 cal | 83.68 J |
| 21 cal | 87.864 J |
| 22 cal | 92.048 J |
| 23 cal | 96.232 J |
| 24 cal | 100.416 J |
| 25 cal | 104.6 J |
| 26 cal | 108.784 J |
More cal to J values
- 27 cal
- 28 cal
- 29 cal
- 30 cal
- 31 cal
- 32 cal
- 33 cal
- 34 cal
- 35 cal
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- 1,000 cal
- 1,200 cal
- 1,500 cal
- 2,000 cal
- 2,500 cal
- 3,000 cal
- 4,000 cal
- 5,000 cal
- 10,000 cal
What is a calorie?
The calorie (small calorie) is the energy needed to raise the temperature of one gram of water by about one degree Celsius.
What is a joule?
The joule is the SI unit of energy, work and heat.
Convert calories to other units
Convert other units to joules
Frequently asked questions
How many joules are in a calorie?
One calorie is 4.184 joules.
How many calories are in a joule?
One joule is 0.2390057361 calories.
What is the formula to convert calories to joules?
J = cal × 4.184.
How many joules in a calorie?
4.184 joules.