Calorie to Joule Converter
Convert calories to joules with this free energy converter. The exact relationship used on this page is 1 calorie = 4.184 joules. Type any number — the result updates instantly, works on phones and desktops, and is ready to copy into homework, a spec sheet, or a shopping list.
Formula: Joule = Calorie × 4.184
How to convert calories to joules
- Enter the value in calories in the converter.
- Read the equivalent amount in joules.
- Use the swap link if you need joule to calorie instead.
- Check the table for common values without typing.
Worked examples
- 1 cal = 4.184 J
- 5 cal = 20.92 J
- 10 cal = 41.84 J
- 25 cal = 104.6 J
Conversion table
Common calories values converted to joules.
| cal | 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 |
| 20 | 83.68 |
| 50 | 209.2 |
| 100 | 418.4 |
| 250 | 1,046 |
| 500 | 2,092 |
| 1,000 | 4,184 |
About this conversion
Calorie (cal) and Joule (J) are both energy units. Energy converters connect food labels (kcal), electricity bills (kWh), physics (joules), and heating (BTU). Bookmark this URL when you convert calories to joules often, then explore related pairs in the same category if you need a different target unit.
Need the other direction? Open the joule to calorie converter.
FAQ
How many joules are in 1 calorie?+
1 calorie equals 4.184 joules.
What is the formula to convert calories to joules?+
Joule = Calorie × 4.184
How do I convert calories to joules by hand?+
Multiply the calorie value by 4.184. Example: 10 calories × 4.184 = 41.84 joules.
Is this cal to J converter accurate?+
Yes. Linear conversions use internationally agreed factors relative to SI. Temperature and inverse fuel units use the standard offset or reciprocal formulas, not a guessed scale factor.