Online calculator to convert calories to kilojoules (cal to kJ) with formulas, examples, and tables. Our conversions provide a quick and easy way to convert between Energy units.
Conversion Calculator
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Convert calories to kJ
TIP: If the result of your conversion is 0, try increasing the "Decimals".
Conversion Definitions
The following is a list of definitions relating to conversions between calories and kilojoules.
What is a calorie (cal)?
A calorie (or thermochemical calorie) is a unit of energy in the International System of Units (SI). The symbol for calorie is cal. There are 239.00573614 calories in a kilojoule. A calorie is measured as the quantity of heat required to raise the temperature of 1 gram of water by 1°C from a standard initial temperature at a pressure of 1 atmosphere. A calorie is also called a "small calorie" or "gram calorie".
What is a kilojoule (kJ)?
A kilojoule is a unit of energy in the International System of Units (SI). The symbol for kilojoule is kJ. There are 0.004184 kilojoules in a calorie.
Conversion Formula
Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper.
The formula to convert from calories to kJ is:
kJ = calories x 0.004184
Conversion Example
Next, let's look at an example showing the work and calculations that are involved in converting from calories to kilojoules (cal to kJ).
Calorie to Kilojoule Conversion Example
Task: Convert 75,000 calories to kilojoules (show work) Formula: calories x 0.004184 = kJ Calculations: 75,000 calories x 0.004184 = 313.8 kJ Result: 75,000 calories is equal to 313.8 kJ
Conversion Table
For quick reference purposes, below is a conversion table that you can use to convert from calories to kilojoules.
Calories to Kilojoules Conversion Chart
| calories (cal) | kilojoules (kJ) |
|---|---|
| 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 |
| 20 cal | 0.08368 kJ |
| 30 cal | 0.12552 kJ |
| 40 cal | 0.16736 kJ |
| 50 cal | 0.2092 kJ |
| 75 cal | 0.3138 kJ |
| 100 cal | 0.4184 kJ |
| 250 cal | 1.046 kJ |
| 500 cal | 2.092 kJ |
| 750 cal | 3.138 kJ |
| 1,000 cal | 4.184 kJ |
| 2,500 cal | 10.46 kJ |
| 5,000 cal | 20.92 kJ |
| 7,500 cal | 31.38 kJ |
| 10,000 cal | 41.84 kJ |
| 25,000 cal | 104.6 kJ |
| 50,000 cal | 209.2 kJ |
| 75,000 cal | 313.8 kJ |
| 100,000 cal | 418.4 kJ |
| 250,000 cal | 1,046 kJ |
Related Units
This table provides a summary of the Energy units within their respective measurement systems.
| Unit | Symbol | Measurement System |
|---|---|---|
| calories (thermochemical) | cal | International System of Units (SI) |
| kilocalories | kcal | International System of Units (SI) |
| British Thermal Unit | BTU or Btu | Imperial System |
| joules | J | International System of Units (SI) |
| kilojoules | kJ | International System of Units (SI) |
| megajoules | MJ | International System of Units (SI) |
| gigajoules | GJ | International System of Units (SI) |
| terajoules | TJ | International System of Units (SI) |
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