How to convert calories to kilocalories
To convert calories to kilocalories, multiply by 0.001. Energy conversions connect nutrition, electricity bills, heating systems and physics.
Calorie to Kilocalorie conversion table
| Calorie (cal) | Kilocalorie (kcal) |
|---|---|
| 0.1 cal | 0.0001 kcal |
| 0.5 cal | 0.0005 kcal |
| 1 cal | 0.001 kcal |
| 2 cal | 0.002 kcal |
| 3 cal | 0.003 kcal |
| 4 cal | 0.004 kcal |
| 5 cal | 0.005 kcal |
| 10 cal | 0.01 kcal |
| 20 cal | 0.02 kcal |
| 25 cal | 0.025 kcal |
| 50 cal | 0.05 kcal |
| 100 cal | 0.1 kcal |
| 500 cal | 0.5 kcal |
| 1,000 cal | 1 kcal |
About the units
Calorie (cal)
A (small) thermochemical calorie is exactly 4.184 joules.
Kilocalorie (kcal)
A kilocalorie (food Calorie) equals 1,000 small calories, or 4,184 joules.
How to use this converter
- Type the number of calories (cal) in the input box.
- The result in kilocalories appears instantly — no button needed.
- See the same value in every other energy unit just below.
- Use “Swap units” to convert kilocalories back to calories.
When you’ll use the calorie to kilocalorie conversion
Converting calories to kilocalories comes up more often than you might expect — for example when comparing fuel and battery capacities, reading appliance labels, or understanding your electricity bill in kWh. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 The factor is exact and easy to remember: 1 cal = 0.001 kcal.
Watch out for these mix-ups
- Food “Calories” are kilocalories (kcal), not small calories.
- kW is power (a rate); kWh is energy (an amount).
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many kilocalories are in one calorie?
One calorie equals 0.001 kilocalories. 0.001 is the exact factor used by this converter.
How do I convert calories to kilocalories?
Multiply the value in calories by 0.001. To go the other way, multiply kilocalories by 1,000.
What is 10 cal in kcal?
10 cal = 0.01 kcal. Also, 5 cal = 0.005 kcal and 100 cal = 0.1 kcal.
What is the difference between a calorie and a kilocalorie?
A (small) thermochemical calorie is exactly 4.184 joules. A kilocalorie (food Calorie) equals 1,000 small calories, or 4,184 joules.
Is this tool free and private?
Yes — the Calorie to Kilocalorie is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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