Millijoules to Calories Converter
Enter the energy in millijoules below to convert it to calories.
Convert Millijoules to Calories
Enter a value in millijoules (mJ) to convert to calories (cal).
Millijoule to Gram Calorie Conversion Table
Table showing various millijoule measurements converted to calories. Click any preset value or arrow to load it into the converter.
| Millijoules (mJ) | Calories (cal) |
|---|---|
| 1 mJ | 0.000239006 cal |
| 2 mJ | 0.000478011 cal |
| 2.5 mJ | 0.000597514 cal |
| 5 mJ | 0.001195 cal |
| 10 mJ | 0.0023901 cal |
| 15 mJ | 0.0035851 cal |
| 20 mJ | 0.0047801 cal |
| 25 mJ | 0.0059751 cal |
| 30 mJ | 0.0071702 cal |
| 50 mJ | 0.0119503 cal |
How to Convert Millijoules to Calories
To convert millijoules to calories, multiply the energy by the following conversion ratio: 0.000239006 calories/millijoule.
Since one millijoule is equal to 0.000239006 calories, you can use this simple formula to convert:
The energy in calories is equal to the energy in millijoules multiplied by 0.000239006.
For example, here's how to convert 5 millijoules to calories using the formula above.
How Many Calories Are in a Millijoule?
There are 0.000239006 calories in a millijoule, which is why we use this value in the formula above.
Our millijoule to gram calorie calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Millijoules and calories are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Millijoule?
A millijoule is a unit of energy equal to 1/1,000 of a joule (0.001 J). One-thousandth of a Joule. [1]
The millijoule is classified as a metric and SI-compatible unit of energy. Millijoules can be abbreviated as mJ; for example, 1 millijoule can be written as 1 mJ.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millijoule (mJ) a convenient decimal multiple of the joule (J).
In practice, millijoules (mJ) 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 Gram Calorie?
A gram calorie is a unit of energy equal to 4.184 joules (J), the base unit for energy. Thermochemical gram calorie defined as 4.184 Joules. [2]
The gram calorie is classified as a standard unit of energy. Calories can be abbreviated as cal; for example, 1 gram calorie can be written as 1 cal.
When working with calories (cal) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, calories (cal) are widely used across standard energy applications within international standard workflows, engineering documentation, and technical data sheets.
When converting energy between millijoules (mJ) and calories (cal), keep full floating-point precision (1 mJ = 0.000239006 cal; 1 cal = 4,184 mJ) during intermediate calculations and round only the final gram calorie figure to match your instrument tolerance.
More Millijoule & Gram Calorie Conversions
Need to calculate in the opposite direction? Use our calories to millijoules calculator to switch your starting unit immediately. You can also explore related tools such as converting calories to millijoules, converting joules to calories, or converting calories to joules.
Convert from Millijoules
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Millijoules (mJ) to Calories (cal)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Millijoule (mJ) & Gram Calorie (cal) (cal)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (mJ to cal)