Calorie to Kilocalorie Converter
One Calorie equals 0.001 Kilocalorie (1 cal = 0.001 kcal). Multiply a Calorie value by 0.001 to get the equivalent in Kilocalorie. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
kcal = cal × 0.001
Multiply the Calorie value by 0.001 to get the equivalent value in Kilocalorie.
Example Conversions
1 Calorie (cal)
0.001 Kilocalorie (kcal)
5 Calorie (cal)
0.005 Kilocalorie (kcal)
10 Calorie (cal)
0.01 Kilocalorie (kcal)
25 Calorie (cal)
0.025 Kilocalorie (kcal)
100 Calorie (cal)
0.1 Kilocalorie (kcal)
Conversion Table
| Calorie (cal) | Kilocalorie (kcal) |
|---|---|
| 0.1 | 0.0001 |
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
How to Convert Manually
Use these steps to convert Calorie values to Kilocalorie without the calculator.
- Write down the value in Calorie (cal) that you want to convert.
- Multiply that value by 0.001.
- For example, 10 Calorie × 0.001 = 0.01 Kilocalorie.
- Label the result as Kilocalorie (kcal).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Calorie and one Kilocalorie.
About Calorie and Kilocalorie
The calorie (small calorie) is exactly 4.184 joules — the thermochemical convention, originally the heat to warm one gram of water by 1 °C. Chemistry uses it; food 'Calories' are actually kilocalories. The kilocalorie is 4,184 joules — the food 'Calorie' (capital C) on US nutrition labels. Diet tracking and exercise burn estimates use kilocalories. One Calorie equals 0.001 Kilocalorie (1 cal = 0.001 kcal). Calorie to Kilocalorie conversion comes up most often in chemistry heat calculations and in scientific literature, typically when figures need restating for nutrition labels and diet tracking.
Precision and Rounding: Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Calorie equals 0.015 Kilocalorie.
15 cal × 0.001 = 0.015 kcal
FAQ
How do I convert Calorie to Kilocalorie?
Multiply the Calorie value by 0.001 to get the equivalent value in Kilocalorie.
What is the formula for Calorie to Kilocalorie?
The formula is kcal = cal × 0.001.
How many Kilocalorie are in 1 Calorie?
1 Calorie equals 0.001 Kilocalorie.
Can I convert Kilocalorie back to Calorie?
Yes. 1 Kilocalorie equals 1000 Calorie, and the related converter can reverse the calculation.
What are common names for Calorie and Kilocalorie?
Calorie is shown as cal and may also be searched as calorie, calories, small calorie. Kilocalorie is shown as kcal and may also be searched as kilocalorie, kilocalories, food calorie.
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