Convert calories to kilocalories
Converting calories to kilocalories is a common energy task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 cal equals 0.001 kcal, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert calories to kilocalories
To convert calories to kilocalories, multiply the number of calories by 0.001. For example, 10 cal × 0.001 = 0.01 kcal.
kcal = cal × 0.001
- Write down the value in calories you want to convert.
- Multiply it by 0.001 (the exact cal→kcal factor).
- The result is your value in kilocalories. Check it below with the converter or the table.
Conversion table
Common values of calories and their equivalents in kilocalories:
| cal | kcal |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
About these units
Calorie (cal). The small calorie is the energy needed to raise one gram of water by 1 °C, defined as exactly 4.184 joules. It is mostly used in chemistry and heat calculations.
Kilocalorie (kcal). A kilocalorie equals 1,000 small calories and is the 'Calorie' seen on food labels. An adult needs roughly 2,000–2,500 kcal per day, depending on activity.
Frequently asked questions
How do I convert calories to kilocalories?
To convert calories to kilocalories, multiply the number of calories by 0.001. For example, 10 cal × 0.001 = 0.01 kcal. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many kilocalories are in 1 calorie?
1 cal = 0.001 kcal. That is the fixed relationship used by this converter and by international standards.
How many calories are in 1 kilocalorie?
1 kcal = 1,000 cal. If you are converting in the opposite direction, use our Kilocalorie to Calorie converter for the dedicated table and FAQ.
Is the calories to kilocalories conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.001 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is calorie used for?
The small calorie is the energy needed to raise one gram of water by 1 °C, defined as exactly 4.184 joules. It is mostly used in chemistry and heat calculations.