1 Calories to Joules
1 cal ≈ 4.18 J
1 calorie is approximately 4.18 joules.
How to convert 1 cal to J
Use the formula J = cal × 4.184:
J = 1 × 4.184J = 4.184
So 1 cal = 4.184 J, or about 4.18 J rounded.
Rounded values and quick estimate
- Rounded to a whole number: 4 J
- Rounded to one decimal place: 4.2 J
- Conversion factor: 1 calorie = 4.18 joules
This conversion is exact, so there is no need to estimate: just multiply by 4.184.
1 Calories in other units
- Joules
- 4.18 J
- Kilojoules
- 0.004184 kJ
- Kilocalories (food Calories)
- 0.001 kcal
- Kilowatt-hours
- 0.000001 kWh
1 cal and nearby values
| Calories | Joules |
|---|---|
| 1 cal | 4.18 J |
| 2 cal | 8.37 J |
| 3 cal | 12.55 J |
| 4 cal | 16.74 J |
| 5 cal | 20.92 J |
About calories and joules
The small (thermochemical) calorie is exactly 4.184 joules — the energy to warm 1 gram of water by about 1 °C.
The joule is the SI unit of energy. One food Calorie (kcal) equals 4,184 joules.
Related conversions
Frequently asked questions
What is 1 Calories in Joules?
1 calorie is about 4.18 joules (1 cal ≈ 4.18 J).
How do you convert 1 cal to J?
Apply J = cal × 4.184: J = 1 × 4.184, J = 4.184.
How many calories is 4.18 J?
4.18 J is about 0.999 calories.