Calories to Megajoules Converter
How to convert calories to megajoules
megajoules = calories ÷ 239,005.736
To convert calories to megajoules, divide the number of calories by 239,005.736.
1 cal = 0.000004184 MJ
Examples
- One kilocalorie, or one food Calorie: 1,000 cal ÷ 239,005.736 = 0.004184 MJ
- 500 cal ÷ 239,005.736 = 0.002092 MJ
Good to know
This is the thermochemical calorie, exactly 4.184 J. It is the small calorie: the "Calories" on food labels are kilocalories, 1000 times larger. The International Table calorie (4.1868 J) is slightly different.
Calories to megajoules conversion table
| Calories (cal) | Megajoules (MJ) |
|---|---|
| 1 cal | 0.000004184 MJ |
| 2 cal | 0.000008368 MJ |
| 5 cal | 0.00002092 MJ |
| 10 cal | 0.00004184 MJ |
| 20 cal | 0.00008368 MJ |
| 50 cal | 0.0002092 MJ |
| 100 cal | 0.0004184 MJ |
| 200 cal | 0.0008368 MJ |
| 250 cal | 0.001046 MJ |
| 500 cal | 0.002092 MJ |
| 1,000 cal | 0.004184 MJ |
| 2,000 cal | 0.008368 MJ |
| 2,500 cal | 0.01046 MJ |
| 5,000 cal | 0.02092 MJ |
| 10,000 cal | 0.04184 MJ |
Unit definitions
- Calorie (cal)
- The thermochemical calorie is defined as exactly 4.184 joules, roughly the energy needed to heat one gram of water by one degree Celsius.
- Megajoule (MJ)
- A megajoule is 1,000,000 joules. It is used for the energy content of fuels and for gas billing in some countries.