Convert Calories to Megajoules

Enter the energy in calories below to get the value converted to megajoules.

Results in Megajoules:
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1 cal = 4.184E-6 MJ

How to Convert Calories to Megajoules

To convert a calorie measurement to a megajoule measurement, multiply the energy by the conversion ratio. One calorie is equal to 4.184E-6 megajoules, so use this simple formula to convert:

megajoules = calories × 4.184E-6

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

For example, here's how to convert 5 calories to megajoules using the formula above.
5 cal = (5 × 4.184E-6) = 2.092E-5 MJ

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


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.


One megajoule is equal to 1,000,000 joules, which are 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 109. Megajoules can be abbreviated as MJ, for example 1 megajoule can be written as 1 MJ.

Calorie Measurements and Equivalent Megajoule Conversions

Common calorie values converted to the equivalent megajoule value
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
11 cal 0.000046024 MJ
12 cal 0.000050208 MJ
13 cal 0.000054392 MJ
14 cal 0.000058576 MJ
15 cal 0.00006276 MJ
16 cal 0.000066944 MJ
17 cal 0.000071128 MJ
18 cal 0.000075312 MJ
19 cal 0.000079496 MJ
20 cal 0.00008368 MJ
21 cal 0.000087864 MJ
22 cal 0.000092048 MJ
23 cal 0.000096232 MJ
24 cal 0.0001 MJ
25 cal 0.000105 MJ
26 cal 0.000109 MJ
27 cal 0.000113 MJ
28 cal 0.000117 MJ
29 cal 0.000121 MJ
30 cal 0.000126 MJ
31 cal 0.00013 MJ
32 cal 0.000134 MJ
33 cal 0.000138 MJ
34 cal 0.000142 MJ
35 cal 0.000146 MJ
36 cal 0.000151 MJ
37 cal 0.000155 MJ
38 cal 0.000159 MJ
39 cal 0.000163 MJ
40 cal 0.000167 MJ

More Calorie Energy Conversions

Convert to Joules
1 cal is equal to 4.184 joules
Convert to Kilojoules
1 cal is equal to 0.004184 kilojoules
Convert to Gigajoules
1 cal is equal to 4.184E-9 gigajoules
Convert to Kilocalories
1 cal is equal to 0.001 kilocalories
Convert to Megacalories
1 cal is equal to 1.0E-6 megacalories
Watts x Time
Convert to Watt-hours
1 cal is equal to 0.001162 watt-hours
Convert to Kilowatt-hours
1 cal is equal to 1.1622E-6 kilowatt-hours
Convert to Megawatt-hours
1 cal is equal to 1.1622E-9 megawatt-hours
Convert to Watt-seconds
1 cal is equal to 4.184 watt-seconds
Thermal Units
Convert to British Thermal Units
1 cal is equal to 0.003966 british thermal units
Convert to Million BTU
1 cal is equal to 3.9657E-9 million BTU
Convert to Therms
1 cal is equal to 3.9657E-8 therms
Convert to Quads
1 cal is equal to 3.9657E-18 quads
Convert to Electronvolts
1 cal is equal to 26,114,000,000,000,000,000 electronvolts
Convert to Kiloelectronvolts
1 cal is equal to 26,114,000,000,000,000 kiloelectronvolts
Convert to Megaelectronvolts
1 cal is equal to 26,114,475,092,200.6 megaelectronvolts