How do you convert megajoules to kilocalories?

To convert megajoules (MJ) to kilocalories (kcal), multiply the energy in megajoules by 239.00574 (kilocalories = megajoules × 239.00574).

What is 5 megajoules in kilocalories?

5 megajoules (5 MJ) is equal to 1,195.02868 kilocalories (1,195.02868 kcal).

Which is larger, 1 megajoule (MJ) or 1 kilocalorie (food calorie) (kcal)?

One megajoule (MJ) is larger than one kilocalorie (food calorie) (kcal). Specifically, 1 MJ contains 239.00574 kcal, whereas 1 kcal is 0.004184 MJ.

How do I convert back from kilocalories (kcal) to megajoules (MJ)?

To reverse the calculation from kcal to MJ, multiply your kilocalorie (food calorie) value by the inverse factor 0.004184 (or divide by 239.00574). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round MJ to kcal results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 MJ ≈ 1,195.03 kcal). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Megajoules to Kilocalories Converter

Enter the energy in megajoules below to convert it to kilocalories.

Kilocalories to Megajoules (kcal → MJ)

Convert Megajoules to Kilocalories

Enter a value in megajoules (MJ) to convert to kilocalories (kcal).

Value (MJ)

From

Result

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1,195.028680688kilocalories

5 MJ = 1,195.028680688 kcal

Result updates automatically

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Suggested Conversions

Reference:NIST CODATA (CODATA Energy & Thermodynamic Constants)

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Megajoule to Kilocalorie Conversion Table

Table showing various megajoule measurements converted to kilocalories. Click any preset value or arrow to load it into the converter.

Megajoules (MJ)	Kilocalories (kcal)
1 MJ	239.0057361 kcal
2 MJ	478.0114723 kcal
2.5 MJ	597.5143403 kcal
5 MJ	1,195.0286807 kcal
10 MJ	2,390.0573614 kcal
15 MJ	3,585.0860421 kcal
20 MJ	4,780.1147228 kcal
25 MJ	5,975.1434034 kcal
30 MJ	7,170.1720841 kcal
50 MJ	11,950.2868069 kcal

How to Convert Megajoules to Kilocalories

To convert megajoules to kilocalories, multiply the energy by the following conversion ratio: 239.0057361 kilocalories/megajoule.

Since one megajoule is equal to 239.0057361 kilocalories, you can use this simple formula to convert:

kilocalories = megajoules × 239.0057361

The energy in kilocalories is equal to the energy in megajoules multiplied by 239.0057361.

For example, here's how to convert 5 megajoules to kilocalories using the formula above.

kilocalories = (5 MJ × 239.0057361) = 1,195.0286807 kcal

How Many Kilocalories Are in a Megajoule?

There are 239.0057361 kilocalories in a megajoule, which is why we use this value in the formula above.

1 MJ = 239.0057361 kcal|1 kcal = 0.004184 MJ

Our megajoule to kilocalorie calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Megajoules and kilocalories are both units used to measure energy. Keep reading to learn more about each unit.

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. [1]

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.

Learn more about megajoules in our Energy Converter.

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.

Learn more about kilocalories in our Energy Converter.

When converting energy between megajoules (MJ) and kilocalories (kcal), keep full floating-point precision (1 MJ = 239.0057361 kcal; 1 kcal = 0.004184 MJ) during intermediate calculations and round only the final kilocalorie figure to match your instrument tolerance.

More Megajoule & Kilocalorie Conversions

Need to calculate in the opposite direction? Use our kilocalories to megajoules calculator to switch your starting unit immediately. You can also explore related tools such as converting kilocalories to megajoules, converting calories to kilocalories, or converting kilojoules to kilocalories.

Convert from Megajoules

Convert to Kilocalories

Frequently Asked Questions

There are 239.00574 kilocalories (kcal) in 1 megajoule (MJ). Conversely, 1 kilocalorie (kcal) is equal to 0.004184 megajoules (MJ).

Energy Converter

Quick Info

Direct Factor: 1 megajoule (MJ) equals 239.00574 kilocalories (kcal).
Inverse Factor: 1 kilocalorie (food calorie) (kcal) equals 0.004184 megajoules (MJ).
Formula: kilocalories = megajoules × 239.00574.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Megajoule (MJ)

Equal to 1,000,000 Joules.

Kilocalorie (Food Calorie) (kcal)

Dietary Calorie equal to 1,000 small calories (4,184 Joules).

Joule (J)

Coherent SI unit of energy and work (1 W·s = 1 N·m).

References

[1]NIST CODATA · CODATA Energy & Thermodynamic Constants
Source
[2]NIST SP 811 · NIST SP 811 App. B.9 (Energy, Work & Heat)
Source
[3]BIPM · Derived SI Unit: Joule (J)
Source

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References

NIST · BIPM · ISO

[1]
NIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Megajoules (MJ) to Kilocalories (kcal)
NIST CODATA Standard
[2]
NIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Megajoule (MJ) & Kilocalorie (Food Calorie) (kcal)
NIST SP 811 Specification
[3]
BIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (MJ to kcal)
BIPM Reference

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