Kilocalories to Kilojoules
Convert kilocalories to kilojoules instantly, with a reference table.
Kilocalories to Kilojoules at a glance
Kilocalories to Kilojoules is a free online converter you can use right now to convert kilocalories to kilojoules instantly, with a reference table โ no account, no install and no usage limit. It runs entirely inside your browser, so whatever you enter stays on your own device.
- Price
- Free โ no trial, no paid tier, no watermark
- Sign-up
- Not required
- Where it runs
- In your browser โ nothing is uploaded to a server
- Works on
- Chrome, Safari, Firefox and Edge โ desktop, tablet and phone
- Category
- Unit Conversions
Kilocalories to Kilojoules conversion table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 500 kcal | 2,092 kJ |
| 1000 kcal | 4,184 kJ |
About Kilocalories to Kilojoules
Convert kilocalories to kilojoules instantly, with a reference table of common values. The factor is exact: 1 kcal = 4.184 kJ.
The reverse, needed when a US calorie figure has to be entered into a system or label that uses kilojoules.
The kilocalorie is 1,000 small calories. What food labels and diet advice call a calorie is almost always a kilocalorie, sometimes written with a capital C to distinguish it โ a distinction that is rarely observed and constantly causes confusion. It is the food energy unit in the United States and in everyday nutritional conversation worldwide. A typical daily intake is around 2,000 kcal, which is 2,000,000 small calories.
Worked through with real numbers: 1 kcal is 4.184 kJ, 100 kcal is 418.4 kJ, 2000 kcal is 8368 kJ.
As for the other side of the conversion: one kilocalorie is 4.184 kJ, so a 2,000 kcal daily intake is about 8,400 kJ.
Energy conversions run into the calorie problem: the calorie on a food label is really a kilocalorie, a thousand times the calorie used in chemistry. Mixing the two produces errors of a factor of a thousand.
How to use Kilocalories to Kilojoules
- Enter the number of kilocalories you want to convert.
- The equivalent in kilojoules appears instantly โ there is no button to press.
- Check the reference table for common Kilocalories to Kilojoules values.
Frequently asked questions
How do I convert kilocalories to kilojoules?
Multiply your kilocalories figure by 4.184 to get kilojoules โ or type a value above and read the answer straight off.
How many kilojoules are in one kilocalorie?
1 kcal = 4.184 kJ.
When would I need to convert kilocalories to kilojoules?
The reverse, needed when a US calorie figure has to be entered into a system or label that uses kilojoules.
What is a kilocalorie, exactly?
The kilocalorie is 1,000 small calories. What food labels and diet advice call a calorie is almost always a kilocalorie, sometimes written with a capital C to distinguish it โ a distinction that is rarely observed and constantly causes confusion. A typical daily intake is around 2,000 kcal, which is 2,000,000 small calories.
Where is the kilojoule actually used?
It is the primary food energy unit in Europe, Australia and New Zealand, usually printed alongside kilocalories. One kilocalorie is 4.184 kJ, so a 2,000 kcal daily intake is about 8,400 kJ.
Is there anything tricky about energy conversions?
Energy conversions run into the calorie problem: the calorie on a food label is really a kilocalorie, a thousand times the calorie used in chemistry. Mixing the two produces errors of a factor of a thousand.
Is this converter accurate?
Yes. It uses the exact standard factor of 1 kcal = 4.184 kJ, and the conversion runs in your browser so nothing is uploaded.