Kilojoules to Kilocalories Converter
Enter the energy in kilojoules below to convert it to kilocalories.
Convert Kilojoules to Kilocalories
Enter a value in kilojoules (kJ) to convert to kilocalories (kcal).
Kilojoule to Kilocalorie Conversion Table
Table showing various kilojoule measurements converted to kilocalories. Click any preset value or arrow to load it into the converter.
| Kilojoules (kJ) | Kilocalories (kcal) |
|---|---|
| 1 kJ | 0.2390057 kcal |
| 2 kJ | 0.4780115 kcal |
| 5 kJ | 1.1950287 kcal |
| 10 kJ | 2.3900574 kcal |
| 15 kJ | 3.585086 kcal |
| 20 kJ | 4.7801147 kcal |
| 25 kJ | 5.9751434 kcal |
| 30 kJ | 7.1701721 kcal |
| 50 kJ | 11.9502868 kcal |
| 75 kJ | 17.9254302 kcal |
How to Convert Kilojoules to Kilocalories
To convert kilojoules to kilocalories, multiply the energy by the following conversion ratio: 0.2390057 kilocalories/kilojoule.
Since one kilojoule is equal to 0.2390057 kilocalories, you can use this simple formula to convert:
The energy in kilocalories is equal to the energy in kilojoules multiplied by 0.2390057.
For example, here's how to convert 2000 kilojoules to kilocalories using the formula above.
How Many Kilocalories Are in a Kilojoule?
There are 0.2390057 kilocalories in a kilojoule, which is why we use this value in the formula above.
Our kilojoule to kilocalorie calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Kilojoules and kilocalories are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Kilojoule?
A kilojoule is a unit of energy equal to 1,000 joules (J), the base unit for energy. Equal to 1,000 Joules. [1]
The kilojoule is classified as a metric and SI-compatible unit of energy. Kilojoules can be abbreviated as kJ; for example, 1 kilojoule can be written as 1 kJ.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilojoule (kJ) a convenient decimal multiple of the joule (J).
In practice, kilojoules (kJ) are widely used across large-scale industrial, bulk, and macro-level energy specifications within SI metric workflows, engineering documentation, and technical data sheets.
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). [2]
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.
When converting energy between kilojoules (kJ) and kilocalories (kcal), keep full floating-point precision (1 kJ = 0.2390057 kcal; 1 kcal = 4.184 kJ) during intermediate calculations and round only the final kilocalorie figure to match your instrument tolerance.
More Kilojoule & Kilocalorie Conversions
Need to calculate in the opposite direction? Use our kilocalories to kilojoules converter (kcal to kJ) to switch your starting unit immediately. You can also explore related tools such as converting calories to kilocalories, converting kilojoules to joules, or converting joules to calories.
Convert from Kilojoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Kilojoules (kJ) to Kilocalories (kcal)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Kilojoule (kJ) & Kilocalorie (Food Calorie) (kcal)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (kJ to kcal)