Formula.joules = calories × 4.184.
Relationship.1 cal = 4.184 J.
Worked example. 500 cal = 2,092 J.
Calories to Joules Converter.
1 cal = 4.184 J, so 500 cal = 2,092 J. Type any value below to convert calories to joules instantly.
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| J | kJ | cal | kcal | Wh | kWh | BTU | eV |
|---|---|---|---|---|---|---|---|
| 2.092 | 0.002092 | 0.5 | 0.0005 | 0.0005811111 | 5.811111e-7 | 0.0019828256 | 1.305868e+19 |
| 20.92 | 0.02092 | 5 | 0.005 | 0.0058111111 | 0.0000058111 | 0.0198282562 | 1.305868e+20 |
| 209.2 | 0.2092 | 50 | 0.05 | 0.0581111111 | 0.0000581111 | 0.1982825621 | 1.305868e+21 |
| 2092 | 2.092 | 500 | 0.5 | 0.5811111111 | 0.0005811111 | 1.982826 | 1.305868e+22 |
| 20920 | 20.92 | 5000 | 5 | 5.811111 | 0.0058111111 | 19.828256 | 1.305868e+23 |
| 209200 | 209.2 | 50000 | 50 | 58.111111 | 0.0581111111 | 198.282562 | 1.305868e+24 |
| 2092000 | 2092 | 500000 | 500 | 581.111111 | 0.5811111111 | 1982.8256 | 1.305868e+25 |
How to convert calories to joules
calories to joules conversion table
| cal | J |
|---|---|
| 1 | 4.184 |
| 5 | 20.92 |
| 10 | 41.84 |
| 25 | 104.6 |
| 50 | 209.2 |
| 100 | 418.4 |
| 200 | 836.8 |
| 250 | 1046 |
| 300 | 1255.2 |
| 400 | 1673.6 |
| 500 | 2092 |
| 750 | 3138 |
| 1000 | 4184 |
| 1500 | 6276 |
| 2000 | 8368 |
| 2500 | 10460 |
| 3000 | 12552 |
| 5000 | 20920 |
| 7500 | 31380 |
| 10000 | 41840 |
| 20000 | 83680 |
| 50000 | 209200 |
| 100000 | 418400 |
| 500000 | 2092000 |
| 2000000 | 8368000 |
Frequently Asked Questions
How do I convert calories to joules?
Multiply by 4.184. For example, 500 cal × 4.184 = 2,092 joules.
How many joules is a 250-Calorie snack?
Food Calories are kilocalories, so 250 Cal = 250,000 cal = 1,046,000 joules (1,046 kJ). If you enter 250 here you get 1,046 J — a thousand times smaller — so multiply food-label figures by 1,000 first.
What is the difference between cal and kcal?
1 kcal = 1,000 cal. Nutrition uses kcal (often capitalised as "Calorie"), while chemistry and physics use the small calorie. The capital-C convention is easy to miss, which is why kJ is arguably the clearer label.
How many joules does the average person eat per day?
A 2,000 kcal diet is about 8.37 million joules (8,368 kJ), which is roughly 2.32 kilowatt-hours — comparable to the daily electricity use of a small refrigerator.