Cal to J ConverterRight in Your Browser
Convert calories (cal) to joules (J). The calorie (cal) is the small scientific calorie — the heat to warm one gram of water by one degree Celsius. The joule (J) is the SI energy unit — the work of pushing with one newton for one meter. Everything is calculated locally in your browser — no server, and it works offline.
4.184 J
in joules (joule)
To convert calories to joules, multiply the calorie value by 4.184.
Switch to J to CalCal to J Chart
| Calories (cal) | Joules (J) |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 3 | 12.552 |
| 4 | 16.736 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 50 | 209.2 |
| 100 | 418.4 |
Frequently Asked Questions
How many joules are in a calorie?
One calorie equals 4.184 joules (1 cal = 4.184 J). So to go from calories to joules, multiply the calorie value by 4.184.
What is the formula to convert calories to joules?
To convert calories to joules, multiply the calorie value by 4.184. For example, 10 cal is 41.84 J.
What is 1000 calories in joules?
1000 calories — one food Calorie (kcal) — is 4184 joules. The converter above works for any value, entirely in your browser.
Is the calorie to joule conversion exact?
The factor used here is the defined value: 1 cal = 4.184 J. Results are rounded to six significant digits for readability, so for high-precision work use the full factor. This is the thermochemical calorie, defined as exactly 4.184 J. Note that food-label "Calories" are actually kilocalories — 1,000 of these small calories.
Every conversion runs 100% in your browser — zero files uploaded, ever.
How to verify it yourself →