Calories to Megajoules Converter

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

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Result in Megajoules:

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1 cal = 4.184E-6 MJ
Hint: use a scientific notation calculator to convert E notation to decimal

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How to Convert Calories to Megajoules

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Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.

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To convert a measurement in calories to a measurement in megajoules, multiply the energy by the following conversion ratio: 4.184E-6 megajoules/calorie.

Since one calorie is equal to 4.184E-6 megajoules, you can use this simple formula to convert:

megajoules = calories × 4.184E-6

The energy in megajoules is equal to the energy in calories multiplied by 4.184E-6.

For example, here's how to convert 500,000 calories to megajoules using the formula above.
megajoules = (500,000 cal × 4.184E-6) = 2.092 MJ

Calories and megajoules are both units used to measure energy. Keep reading to learn more about each unit of measure.

What Is a Calorie?

One calorie is equal to the heat needed to raise the temperature of one gram of water from 14.5 to 15.5 degrees Celsius.

When measuring the energy content in foods, the large calorie, or kilocalorie is used, but it's often still just called a "calorie." When both the calorie and large calorie are used in the same context it is common to refer to the calorie as a "small calorie."

Calories can be abbreviated as cal; for example, 1 calorie can be written as 1 cal.

Learn more about calories.

What Is a Megajoule?

One megajoule is equal to 1,000,000 joules, which is the energy equal to the force on an object of one newton at a distance of one meter.

The megajoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "mega" is the prefix for millions, or 106. Megajoules can be abbreviated as MJ; for example, 1 megajoule can be written as 1 MJ.

Learn more about megajoules.

Calorie to Megajoule Conversion Table

Table showing various calorie measurements converted to megajoules.
Calories Megajoules
1 cal 0.000004184 MJ
2 cal 0.000008368 MJ
3 cal 0.000012552 MJ
4 cal 0.000016736 MJ
5 cal 0.00002092 MJ
6 cal 0.000025104 MJ
7 cal 0.000029288 MJ
8 cal 0.000033472 MJ
9 cal 0.000037656 MJ
10 cal 0.00004184 MJ
100 cal 0.000418 MJ
1,000 cal 0.004184 MJ
10,000 cal 0.04184 MJ
100,000 cal 0.4184 MJ
1,000,000 cal 4.184 MJ

More Calorie & Megajoule Conversions