Convert Calories to Gigajoules

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

Results in Gigajoules:
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1 cal = 4.184E-9 GJ

How to Convert Calories to Gigajoules

To convert a calorie measurement to a gigajoule measurement, multiply the energy by the conversion ratio. One calorie is equal to 4.184E-9 gigajoules, so use this simple formula to convert:

gigajoules = calories × 4.184E-9

The energy in gigajoules is equal to the calories multiplied by 4.184E-9.

For example, here's how to convert 5 calories to gigajoules using the formula above.
5 cal = (5 × 4.184E-9) = 2.092E-8 GJ

Calories and gigajoules 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 gigajoule is equal to 1,000,000,000 joules, which are the energy equal to the force on an object of one newton at a distance of one meter.

The gigajoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "giga" is the prefix for 106. Gigajoules can be abbreviated as GJ, for example 1 gigajoule can be written as 1 GJ.

Calorie Measurements and Equivalent Gigajoule Conversions

Common calorie values converted to the equivalent gigajoule value
Calories Gigajoules
1 cal 0.000000004184 GJ
2 cal 0.000000008368 GJ
3 cal 0.000000012552 GJ
4 cal 0.000000016736 GJ
5 cal 0.00000002092 GJ
6 cal 0.000000025104 GJ
7 cal 0.000000029288 GJ
8 cal 0.000000033472 GJ
9 cal 0.000000037656 GJ
10 cal 0.00000004184 GJ
11 cal 0.000000046024 GJ
12 cal 0.000000050208 GJ
13 cal 0.000000054392 GJ
14 cal 0.000000058576 GJ
15 cal 0.00000006276 GJ
16 cal 0.000000066944 GJ
17 cal 0.000000071128 GJ
18 cal 0.000000075312 GJ
19 cal 0.000000079496 GJ
20 cal 0.00000008368 GJ
21 cal 0.000000087864 GJ
22 cal 0.000000092048 GJ
23 cal 0.000000096232 GJ
24 cal 0.00000010042 GJ
25 cal 0.0000001046 GJ
26 cal 0.00000010878 GJ
27 cal 0.00000011297 GJ
28 cal 0.00000011715 GJ
29 cal 0.00000012134 GJ
30 cal 0.00000012552 GJ
31 cal 0.0000001297 GJ
32 cal 0.00000013389 GJ
33 cal 0.00000013807 GJ
34 cal 0.00000014226 GJ
35 cal 0.00000014644 GJ
36 cal 0.00000015062 GJ
37 cal 0.00000015481 GJ
38 cal 0.00000015899 GJ
39 cal 0.00000016318 GJ
40 cal 0.00000016736 GJ

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 Megajoules
1 cal is equal to 4.184E-6 megajoules
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