Calories to Kilocalories Converter
Enter the energy in calories below to convert it to kilocalories.
Convert Calories to Kilocalories
Enter a value in calories (cal) to convert to kilocalories (kcal).
Gram Calorie to Kilocalorie Conversion Table
Table showing various gram calorie measurements converted to kilocalories. Click any preset value or arrow to load it into the converter.
| Calories (cal) | Kilocalories (kcal) |
|---|---|
| 1 cal | 0.001 kcal |
| 2 cal | 0.002 kcal |
| 5 cal | 0.005 kcal |
| 10 cal | 0.01 kcal |
| 15 cal | 0.015 kcal |
| 20 cal | 0.02 kcal |
| 25 cal | 0.025 kcal |
| 30 cal | 0.03 kcal |
| 50 cal | 0.05 kcal |
| 75 cal | 0.075 kcal |
How to Convert Calories to Kilocalories
To convert calories to kilocalories, multiply the energy by the following conversion ratio: 0.001 kilocalories/gram calorie.
Since one gram calorie is equal to 0.001 kilocalories, you can use this simple formula to convert:
The energy in kilocalories is equal to the energy in calories multiplied by 0.001.
For example, here's how to convert 2000000 calories to kilocalories using the formula above.
How Many Kilocalories Are in a Gram Calorie?
There are 0.001 kilocalories in a gram calorie, which is why we use this value in the formula above.
Our gram calorie to kilocalorie calculator automatically converts your energy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Calories and kilocalories are both units used to measure energy. Keep reading to learn more about each unit.
What Is a Gram Calorie?
A gram calorie is a unit of energy equal to 4.184 joules (J), the base unit for energy. Thermochemical gram calorie defined as 4.184 Joules. [1]
The gram calorie is classified as a standard unit of energy. Calories can be abbreviated as cal; for example, 1 gram calorie can be written as 1 cal.
When working with calories (cal) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, calories (cal) are widely used across standard energy applications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Kilocalorie?
A kilocalorie is a unit of energy equal to 4,184 joules (J), the base unit for energy. Dietary Calorie equal to 1,000 small calories (4,184 Joules). [2]
The kilocalorie is classified as a standard unit of energy. Kilocalories can be abbreviated as kcal; for example, 1 kilocalorie can be written as 1 kcal.
In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilocalorie (kcal) a convenient decimal multiple of the calorie (cal).
In practice, kilocalories (kcal) are widely used across large-scale industrial, bulk, and macro-level energy specifications within international standard workflows, engineering documentation, and technical data sheets.
When converting energy between calories (cal) and kilocalories (kcal), keep full floating-point precision (1 cal = 0.001 kcal; 1 kcal = 1,000 cal) during intermediate calculations and round only the final kilocalorie figure to match your instrument tolerance.
More Gram Calorie & Kilocalorie Conversions
Need to calculate in the opposite direction? Use our kilocalories to calories calculator to switch your starting unit immediately. You can also explore related tools such as converting kilocalories to calories, converting kilojoules to kilocalories, or converting calories to joules.
Convert from Calories
Frequently Asked Questions
References
- [1]NIST CODATA StandardNIST CODATA (CODATA Energy & Thermodynamic Constants)·Energy Metrology Standard — Calories (cal) to Kilocalories (kcal)
- [2]NIST SP 811 SpecificationNIST SP 811 (NIST SP 811 App. B.9 (Energy, Work & Heat))·Unit Specifications: Gram Calorie (cal) (cal) & Kilocalorie (Food Calorie) (kcal)
- [3]BIPM ReferenceBIPM (Derived SI Unit: Joule (J))·Conversion Factors & Mathematical Basis (cal to kcal)