calories to joules
Convert calorie (small) to joule — instant, free, with the formula shown.
1 cal=4.184 J
How to convert calorie (small) to joule
To convert calorie (small) to joule, multiply by 4.184:
J = cal × 4.184
For example, 10 cal × 4.184 = 41.84 J.
cal to J conversion table
| calories (cal) | joules (J) |
|---|---|
| 1 cal | 4.184 J |
| 2 cal | 8.368 J |
| 5 cal | 20.92 J |
| 10 cal | 41.84 J |
| 25 cal | 104.6 J |
| 50 cal | 209.2 J |
| 100 cal | 418.4 J |
| 250 cal | 1046 J |
| 500 cal | 2092 J |
| 1000 cal | 4184 J |
Other calorie (small) conversions
Convert to joule from another unit
cal to J — frequently asked
How many joules are in 1 calorie (small)?
1 calorie (small) = 4.184 joules (cal × 4.184 = J).
What is the formula to convert calorie (small) to joule?
Multiply your calorie (small) value by 4.184 to get joule.
How do I convert 10 calories to joules?
10 cal = 41.84 J. For 100 cal the answer is 418.4 J. Use the calculator on this page for any other value.
When to convert calorie (small) to joule
1Electricity bills (kWh)
2Nutrition labels (kcal / food cal)
3HVAC and heating (BTU, therms)
4Physics and chemistry (J, eV)
Energy conversion — common questions
Is a food calorie the same as a calorie?
No — a food 'Calorie' (capital C) actually means 1 kilocalorie = 1,000 small calories = 4,184 J. Nutrition labels typically write 'cal' meaning kcal.
How many joules in 1 kWh?
1 kWh = 3,600,000 J (3.6 MJ). Because 1 kW × 1 hour = 1,000 W × 3,600 s = 3,600,000 J.
What is a BTU?
British Thermal Unit — the energy required to raise 1 pound of water by 1 °F. 1 BTU ≈ 1,055 J.
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