Convert Calories to Kilojoules

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

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1 cal = 0.004184 kJ

How to Convert Calories to Kilojoules

To convert a calorie measurement to a kilojoule measurement, multiply the energy by the conversion ratio. One calorie is equal to 0.004184 kilojoules, so use this simple formula to convert:

kilojoules = calories × 0.004184

The energy in kilojoules is equal to the calories multiplied by 0.004184.

For example, here's how to convert 5 calories to kilojoules using the formula above.
5 cal = (5 × 0.004184) = 0.02092 kJ

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

Calories

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.

Kilojoules

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

The kilojoule is a multiple of the joule, which is the SI derived unit for energy. In the metric system, "kilo" is the prefix for 103. Kilojoules can be abbreviated as kJ, for example 1 kilojoule can be written as 1 kJ.

Calorie Measurements and Equivalent Kilojoule Conversions

Common calorie values converted to the equivalent kilojoule value
Calories Kilojoules
1 cal 0.004184 kJ
2 cal 0.008368 kJ
3 cal 0.012552 kJ
4 cal 0.016736 kJ
5 cal 0.02092 kJ
6 cal 0.025104 kJ
7 cal 0.029288 kJ
8 cal 0.033472 kJ
9 cal 0.037656 kJ
10 cal 0.04184 kJ
11 cal 0.046024 kJ
12 cal 0.050208 kJ
13 cal 0.054392 kJ
14 cal 0.058576 kJ
15 cal 0.06276 kJ
16 cal 0.066944 kJ
17 cal 0.071128 kJ
18 cal 0.075312 kJ
19 cal 0.079496 kJ
20 cal 0.08368 kJ
21 cal 0.087864 kJ
22 cal 0.092048 kJ
23 cal 0.096232 kJ
24 cal 0.100416 kJ
25 cal 0.1046 kJ
26 cal 0.108784 kJ
27 cal 0.112968 kJ
28 cal 0.117152 kJ
29 cal 0.121336 kJ
30 cal 0.12552 kJ
31 cal 0.129704 kJ
32 cal 0.133888 kJ
33 cal 0.138072 kJ
34 cal 0.142256 kJ
35 cal 0.14644 kJ
36 cal 0.150624 kJ
37 cal 0.154808 kJ
38 cal 0.158992 kJ
39 cal 0.163176 kJ
40 cal 0.16736 kJ

More Calorie Energy Conversions

Joules
Convert to Joules
1 cal is equal to 4.184 joules
Convert to Megajoules
1 cal is equal to 4.184E-6 megajoules
Convert to Gigajoules
1 cal is equal to 4.184E-9 gigajoules
Calories
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
Electronvolts
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