Convert calories to joules
1 cal = 4.184 J. Change the amount below, or read the formula and the reference table further down.
1 calorie equals
joules
1 cal = 4.184 J
The formula
Calories and joules both measure energy from the same zero, so a single multiplier does the job.
J = cal × 4.184
Going the other way? Convert joules to calories.
Calories to joules table
Common values, rounded for reading.
| Calories (cal) | Joules (J) |
|---|---|
| 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 |
| 30 | 125.52 |
| 40 | 167.36 |
| 50 | 209.2 |
| 75 | 313.8 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
Questions people ask
- How many joules are in a calorie?
- One calorie equals 4.184 joules.
- How do I convert calories to joules by hand?
- Multiply the number of calories by 4.184. For a rough check, 4.2 is close enough for most everyday use.
- What is 1 calorie in joules?
- 1 calorie is 4.184 joules.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.