1 Joules to Calories
1 J ≈ 0.239 cal
1 joule is approximately 0.239 calories.
How to convert 1 J to cal
Use the formula cal = J ÷ 4.184:
cal = 1 ÷ 4.184cal = 0.239006
So 1 J = 0.239006 cal, or about 0.239 cal rounded.
Rounded values and quick estimate
- Rounded to a whole number: 0 cal
- Rounded to one decimal place: 0.2 cal
- Conversion factor: 1 joule = 0.239 calories
Quick mental estimate: multiply by 0.24. For 1 J that gives about 0.24 cal — within 1% of the exact answer. Use the exact formula when precision matters.
1 Joules in other units
- Calories
- 0.239 cal
- Kilojoules
- 0.001 kJ
- Kilocalories (food Calories)
- 0.000239 kcal
1 J and nearby values
| Joules | Calories |
|---|---|
| 1 J | 0.239 cal |
| 2 J | 0.478 cal |
| 3 J | 0.717 cal |
| 4 J | 0.956 cal |
| 5 J | 1.2 cal |
About joules and calories
The joule is the SI unit of energy. One food Calorie (kcal) equals 4,184 joules.
The small (thermochemical) calorie is exactly 4.184 joules — the energy to warm 1 gram of water by about 1 °C.
Related conversions
Frequently asked questions
What is 1 Joules in Calories?
1 joule is about 0.239 calories (1 J ≈ 0.239 cal).
How do you convert 1 J to cal?
Apply cal = J ÷ 4.184: cal = 1 ÷ 4.184, cal = 0.239006.
How many joules is 0.239 cal?
0.239 cal is about 1 joules.