Joules to Calories
Convert joules to calories instantly.
Joules to Calories (J to cal) Converter
1 joule = 0.23901 calories
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- 1 J = 0.23901 cal
- 5 J = 1.195 cal
- 10 J = 2.3901 cal
- 25 J = 5.9751 cal
- JoulesJ
- KilojouleskJ
- Kilocalorieskcal
- KilojouleskJ
- Caloriescal
- Kilocalorieskcal
How it’s calculated
cal = J ÷ 4.184
- Divide the value in joules by 4.184.
- Equivalently, multiply by 0.2390057361.
- 1 J = 0.2390057361 cal · 1 cal = 4.184 J
Quick examples
1 joule = 0.23901 calories · 1 cal = 4.184 J
- 1 joule = 0.23901 calories
- 5 joules = 1.195 calories
- 10 joules = 2.3901 calories
- 25 joules = 5.9751 calories
- 100 joules = 23.901 calories
Joules to calories conversion table
| Joules (J) | Calories (cal) |
|---|---|
| 0.1 J | 0.023901 cal |
| 0.5 J | 0.1195 cal |
| 1 J | 0.23901 cal |
| 2 J | 0.47801 cal |
| 3 J | 0.71702 cal |
| 4 J | 0.95602 cal |
| 5 J | 1.195 cal |
| 6 J | 1.434 cal |
| 7 J | 1.673 cal |
| 8 J | 1.912 cal |
| 9 J | 2.1511 cal |
| 10 J | 2.3901 cal |
| 15 J | 3.5851 cal |
| 20 J | 4.7801 cal |
| 25 J | 5.9751 cal |
| 30 J | 7.1702 cal |
| 40 J | 9.5602 cal |
| 50 J | 11.95 cal |
| 75 J | 17.925 cal |
| 100 J | 23.901 cal |
| 250 J | 59.751 cal |
| 500 J | 119.5 cal |
| 1,000 J | 239.01 cal |
About these units
Joule (J)
SI (metric)
Base unit
Source: BIPM SI Brochure (9th ed.)
Calorie (thermochemical) (cal)
other
1 cal = 4.184 J (exact)
The small calorie used in chemistry: exactly 4.184 J.
Source: NIST SP 811 / Handbook 44
Frequently asked questions
How do I convert joules to calories?
Use cal = J ÷ 4.184. Divide the value in joules by 4.184.
How many calories are in 1 joule?
1 joule (J) equals 0.23901 calories (cal); more precisely 0.2390057361.
How many joules are in 1 calorie (thermochemical)?
1 calorie (thermochemical) (cal) equals 4.184 joules (J).
What is 10 J in cal?
10 joules = 2.3901 calories.
What is a calorie (thermochemical)?
The small calorie used in chemistry: exactly 4.184 J.
Related conversions
Formula: cal = J ÷ 4.184. Factors last reviewed 2026-10-27.