Microjoules to Kilocalories Converter
Enter the energy in microjoules below to convert it to kilocalories.
Convert Microjoules to Kilocalories
Enter a value in microjoules (µJ) to convert to kilocalories (kcal).
Microjoule to Kilocalorie Conversion Table
Table showing various microjoule measurements converted to kilocalories. Click any preset value or arrow to load it into the converter.
| Microjoules (µJ) | Kilocalories (kcal) |
|---|---|
| 1 µJ | 2.390057e-10 kcal |
| 10 µJ | 2.390057e-9 kcal |
| 100 µJ | 0.000000024 kcal |
| 1,000 µJ | 0.000000239 kcal |
| 10,000 µJ | 0.00000239 kcal |
| 100,000 µJ | 0.000023901 kcal |
| 1,000,000 µJ | 0.000239006 kcal |
| 5,000,000 µJ | 0.001195 kcal |
| 10,000,000 µJ | 0.0023901 kcal |
| 25,400,000 µJ | 0.0060707 kcal |
How to Convert Microjoules to Kilocalories
To convert microjoules to kilocalories, multiply the energy by the following conversion ratio: 2.390057e-10 kilocalories/microjoule.
Since one microjoule is equal to 2.390057e-10 kilocalories, you can use this simple formula to convert:
The energy in kilocalories is equal to the energy in microjoules multiplied by 2.390057e-10.
For example, here's how to convert 5 microjoules to kilocalories using the formula above.
How Many Kilocalories Are in a Microjoule?
There are 2.390057e-10 kilocalories in a microjoule, which is why we use this value in the formula above.
Our microjoule to kilocalorie calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Microjoules and kilocalories are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Microjoule?
A microjoule is a unit of energy equal to 1/1,000,000 of a joule (0.000001 J). One-millionth of a Joule. [1]
The microjoule is classified as a metric and SI-compatible unit of energy. Microjoules can be abbreviated as µJ; for example, 1 microjoule can be written as 1 µJ.
In the metric system, "micro" is the standard SI prefix for millionths, or 10⁻⁶. This makes the microjoule (µJ) a convenient decimal multiple of the joule (J).
In practice, microjoules (µJ) are widely used across fine-tolerance laboratory, analytical, and micro-scale energy measurements 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 microjoules (µJ) and kilocalories (kcal), keep full floating-point precision (1 µJ = 2.390057e-10 kcal; 1 kcal = 4,184,000,000 µJ) during intermediate calculations and round only the final kilocalorie figure to match your instrument tolerance.
More Microjoule & Kilocalorie Conversions
Need to calculate in the opposite direction? Use our kilocalories to microjoules calculator to switch your starting unit immediately. You can also explore related tools such as converting kilocalories to microjoules, converting calories to kilocalories, or converting kilojoules to kilocalories.
Convert from Microjoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Microjoules (µJ) to Kilocalories (kcal)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Microjoule (µJ) & Kilocalorie (Food Calorie) (kcal)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (µJ to kcal)