kcal to MJ Converter - Kilocalorie to Megajoule
Kilocalorie (kcal) to Megajoule (MJ)
Direct answer
1 kcal = 0.004184 MJ
MJ = kcal × 0.004184
Converter
Conversion formula
MJ = kcal × 0.004184
kcal = MJ × 239.005736138
Example: 10 kcal = 10 × 0.004184 = 0.04184 MJ.
Common conversion table
| kcal | MJ |
|---|---|
| 1 kcal | 0.004184 MJ |
| 2 kcal | 0.008368 MJ |
| 5 kcal | 0.02092 MJ |
| 10 kcal | 0.04184 MJ |
| 20 kcal | 0.08368 MJ |
| 50 kcal | 0.2092 MJ |
| 100 kcal | 0.4184 MJ |
| 1,000 kcal | 4.184 MJ |
Conversion derivation
Express both kcal and MJ in the same base unit J (joule), then cancel the shared base unit.
- 1
Rewrite kcal in the base unit
- 2
Rewrite MJ in the base unit
- 3
Forward conversion
- 4
Reverse conversion
AI explanation for this conversion
This pre-generated explanation is schema-checked. Numeric results still come from the page formula and calculator.
Explanation for Kilocalorie (kcal) to Megajoule (MJ) Conversion
This conversion factor relates two units of energy by expressing both in the common base unit of joules (J). The factor is derived from the definitions of a kilocalorie and a megajoule in terms of joules.
Definition
A kilocalorie (kcal) is defined as exactly 4,184 joules. A megajoule (MJ) is defined as exactly 1,000,000 joules.
Principle
To convert between two derived units, express each in terms of a shared base unit. The conversion factor is the ratio of these base-unit values.
Assumptions
- The conversion uses the exact defined relationship: 1 kcal = 4,184 J and 1 MJ = 1,000,000 J.
- The base unit for this conversion is the joule (J).
Cautions
- The provided numeric factor is exact based on the definitions used, but the resulting value may be rounded depending on the required precision for a calculation.
- This conversion applies specifically to the thermochemical or nutritional kilocalorie (kcal) as defined by 1 kcal = 4,184 J, which may differ from other calorie definitions.
FAQ
How many MJ are in 1 kcal?
1 kcal = 0.004184 MJ.
How many MJ are in 10 kcal?
10 kcal = 0.04184 MJ.
How many MJ are in 100 kcal?
100 kcal = 0.4184 MJ.
What is the formula to convert kcal to MJ?
Use MJ = kcal × 0.004184.
How many kcal are in 1 MJ?
1 MJ = 239.005736138 kcal.
What should I check when converting kcal to MJ?
Use the conversion factor and round the result to the precision required by your calculation.