Direct conversion
Convert calorie [cal] to joule [J] instantly with formula, examples, chart, and FAQs.
Quick answer
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1 calorie [cal] = 4.184 joule [J]
1 calorie [cal] = 4.184 joule [J]
Example: 1 calorie [cal] equals 4.184 joule [J].
Energy conversions use joule as the reference unit, including electrical, thermal, nutrition, and mechanical energy units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
The calorie is an energy unit traditionally based on heating water by one degree Celsius.
HistoryCalories were used in heat measurement before joules became the SI standard.
Current useCalories are used in nutrition, food labels, exercise estimates, and diet planning.
The joule is the SI derived unit of energy, work, and heat.
HistoryThe joule is named after James Prescott Joule and became the standard SI energy unit.
Current useJoules are used in physics, engineering, nutrition science, batteries, heating, and mechanical work.
| calorie [cal] | joule [J] |
|---|---|
| 1 | 4.184 |
| 2 | 8.368 |
| 5 | 20.92 |
| 10 | 41.84 |
| 20 | 83.68 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
| 1000 | 4184 |
Use this formula: 1 calorie [cal] = 4.184 joule [J] Enter your value in the calculator and the result updates instantly.
1 calorie [cal] equals 4.184 joule [J].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.