Kilocalories to Megajoules Converter
Enter the energy in kilocalories below to convert it to megajoules.
Convert Kilocalories to Megajoules
Enter a value in kilocalories (kcal) to convert to megajoules (MJ).
Kilocalorie to Megajoule Conversion Table
Table showing various kilocalorie measurements converted to megajoules. Click any preset value or arrow to load it into the converter.
| Kilocalories (kcal) | Megajoules (MJ) |
|---|---|
| 1 kcal | 0.004184 MJ |
| 2 kcal | 0.008368 MJ |
| 2.5 kcal | 0.01046 MJ |
| 5 kcal | 0.02092 MJ |
| 10 kcal | 0.04184 MJ |
| 15 kcal | 0.06276 MJ |
| 20 kcal | 0.08368 MJ |
| 25 kcal | 0.1046 MJ |
| 30 kcal | 0.12552 MJ |
| 50 kcal | 0.2092 MJ |
How to Convert Kilocalories to Megajoules
To convert kilocalories to megajoules, multiply the energy by the following conversion ratio: 0.004184 megajoules/kilocalorie.
Since one kilocalorie is equal to 0.004184 megajoules, you can use this simple formula to convert:
The energy in megajoules is equal to the energy in kilocalories multiplied by 0.004184.
For example, here's how to convert 5 kilocalories to megajoules using the formula above.
How Many Megajoules Are in a Kilocalorie?
There are 0.004184 megajoules in a kilocalorie, which is why we use this value in the formula above.
Our kilocalorie to megajoule calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Kilocalories and megajoules are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Kilocalorie?
A kilocalorie is a unit of energy equal to 4,184 joules (J), the base unit for energy. Dietary Calorie equal to 1,000 small calories (4,184 Joules). [1]
The kilocalorie is classified as a standard unit of energy. Kilocalories can be abbreviated as kcal; for example, 1 kilocalorie can be written as 1 kcal.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilocalorie (kcal) a convenient decimal multiple of the calorie (cal).
In practice, kilocalories (kcal) are widely used across large-scale industrial, bulk, and macro-level energy specifications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Megajoule?
A megajoule is a unit of energy equal to 1,000,000 joules (J), the base unit for energy. Equal to 1,000,000 Joules. [2]
The megajoule is classified as an International System of Units (SI) unit of energy. Megajoules can be abbreviated as MJ; for example, 1 megajoule can be written as 1 MJ.
In the metric system, "mega" is the standard SI prefix for millions, or 10⁶. This makes the megajoule (MJ) a convenient decimal multiple of the joule (J).
In practice, megajoules (MJ) are widely used across large-scale industrial, bulk, and macro-level energy specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting energy between kilocalories (kcal) and megajoules (MJ), keep full floating-point precision (1 kcal = 0.004184 MJ; 1 MJ = 239.0057361 kcal) during intermediate calculations and round only the final megajoule figure to match your instrument tolerance.
More Kilocalorie & Megajoule Conversions
Need to calculate in the opposite direction? Use our megajoules to kilocalories calculator to switch your starting unit immediately. You can also explore related tools such as converting megajoules to kilocalories, converting kilocalories to kilojoules, or converting joules to calories.
Convert from Kilocalories
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Kilocalories (kcal) to Megajoules (MJ)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Kilocalorie (Food Calorie) (kcal) & Megajoule (MJ)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (kcal to MJ)