Kilocalorie to Calorie Converter
Enter the value that you want to convert kilocalorie (kcal) to calorie (cal) or calorie to kilocalorie.Also written as KCAL to CAL conversion.
1 kilocalorie = 1000.0000000 calorie
Formula: calorie = kilocalorie value × 1000.0000000
KCAL to CAL — kilocalorie to calorie
10 kilocalorie = 10000.00000 calorie
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How Kilocalorie Relates to Calorie
What is Kilocalorie?
Kilocalorie (kcal) is a unit of energy measurement. 1 kilocalorie is equal to 1000.0000000 calorie.
About the Calorie
Calorie (cal) is a unit of energy measurement. 1 calorie is equal to 0.0010000 kilocalorie.
Energy Units in Different Fields
Energy measurement units reflect their historical origins across different industries. Electrical engineers use kilowatt-hours, nutritionists use calories, physicists use joules, heating engineers use BTUs, and the petroleum industry uses barrels of oil equivalent. Converting between these units is essential for energy auditing, comparing fuel sources, sizing HVAC systems, and understanding electricity bills relative to gas consumption.
kilocalorie to calorie metric conversion table
| 0.01 kcal | = | 10.00000 cal |
| 0.1 kcal | = | 100.00000 cal |
| 1 kcal | = | 1000.00000 cal |
| 2 kcal | = | 2000.00000 cal |
| 3 kcal | = | 3000.00000 cal |
| 4 kcal | = | 4000.00000 cal |
| 5 kcal | = | 5000.00000 cal |
| 6 kcal | = | 6000.00000 cal |
| 7 kcal | = | 7000.00000 cal |
| 8 kcal | = | 8000.00000 cal |
| 9 kcal | = | 9000.00000 cal |
| 10 kcal | = | 10000.00000 cal |
| 11 kcal | = | 11000.00000 cal |
| 12 kcal | = | 12000.00000 cal |
| 13 kcal | = | 13000.00000 cal |
| 14 kcal | = | 14000.00000 cal |
| 15 kcal | = | 15000.00000 cal |
| 16 kcal | = | 16000.00000 cal |
| 17 kcal | = | 17000.00000 cal |
| 18 kcal | = | 18000.00000 cal |
| 19 kcal | = | 19000.00000 cal |
| 20 kcal | = | 20000.00000 cal |
| 30 kcal | = | 30000.00000 cal |
| 40 kcal | = | 40000.00000 cal |
| 50 kcal | = | 50000.00000 cal |
| 60 kcal | = | 60000.00000 cal |
| 70 kcal | = | 70000.00000 cal |
| 80 kcal | = | 80000.00000 cal |
| 90 kcal | = | 90000.00000 cal |
| 100 kcal | = | 100000.00000 cal |
| 200 kcal | = | 200000.00000 cal |
| 300 kcal | = | 300000.00000 cal |
| 400 kcal | = | 400000.00000 cal |
| 500 kcal | = | 500000.00000 cal |
| 600 kcal | = | 600000.00000 cal |
| 700 kcal | = | 700000.00000 cal |
| 800 kcal | = | 800000.00000 cal |
| 900 kcal | = | 900000.00000 cal |
| 1000 kcal | = | 1000000.00000 cal |
How to Convert KCAL to CAL (Kilocalorie to Calorie)?
We can convert kilocalorie to calorie by using an example.
Example:
Convert 20 Kilocalorie to Calorie?
We know 1 Kilocalorie = 1000.0000000 calorie; 1 Calorie = 0.0010000 kilocalorie.
20 kilocalorie = ___cal
20 × 1000.0000000 = 20000.00000 cal (we know 1 kilocalorie = 1000.0000000 calorie)
Answer:
20 kilocalorie = 20000.00000 calorie
How to Convert Kilocalories to Calories (Step-by-Step)
The food Calorie (capital C) equals 1 kilocalorie (kcal), which equals 1000 small calories (cal). This distinction causes widespread confusion in nutrition and chemistry. Converting kcal to cal simply requires multiplying by 1000.
- Identify the value in kilocalories (kcal or food Calories).
- Multiply by 1000 to convert to small calories (cal).
- The result is in thermochemical calories (gram calories).
- Verify: 1 kcal = 1 Cal (food Calorie) = 1000 cal (small calories).
Common kcal to cal Conversions
Showing the relationship between food Calories and small calories used in chemistry.
| Kilocalorie | Calorie |
|---|---|
| 1 kcal | 1000 cal |
| 0.5 kcal | 500 cal |
| 2 kcal | 2000 cal |
| 100 kcal | 100,000 cal |
| 500 kcal | 500,000 cal |
| 2000 kcal | 2,000,000 cal |
Solved Examples: kcal to cal Conversion
Question 1: A chemistry problem states a reaction releases 3.5 kcal of heat. Express this in calories.
Solution:
Start with 3.5 kcal.
Multiply by 1000: 3.5 × 1000 = 3500 cal.
This is 3500 gram calories or small calories.
Answer: 3.5 kcal = 3500 cal
Question 2: A food label shows 250 Calories (kcal). How many small calories is this?
Solution:
250 Calories = 250 kcal (same thing).
Multiply by 1000: 250 × 1000 = 250,000 cal.
This demonstrates why nutrition uses kcal — the numbers are more manageable.
Answer: 250 kcal = 250,000 cal
Question 3: A bomb calorimeter measures 8.42 kcal from burning a food sample. Express in cal.
Solution:
Start with 8.42 kcal.
Multiply by 1000: 8.42 × 1000 = 8420 cal.
This is the total thermal energy released by combustion.
Answer: 8.42 kcal = 8420 cal
Practice: kcal to cal Conversions
Try solving these on your own to test your understanding:
- Convert 0.75 kcal to cal. (Answer: 750 cal)
- A reaction releases 12.6 kcal. How many cal? (Answer: 12,600 cal)
- Convert 2000 kcal (daily intake) to cal. (Answer: 2,000,000 cal)
- A food has 89 kcal per serving. Express in cal. (Answer: 89,000 cal)
- Convert 0.001 kcal to cal. (Answer: 1 cal)
The Great Calorie Confusion: cal vs Cal vs kcal
The word "calorie" refers to two different units. The small calorie (cal, gram calorie) is the energy to heat 1 g of water by 1°C. The large Calorie (Cal, food Calorie, kilocalorie) is 1000 small calories. US food labels legally use "Calories" meaning kcal. Most countries have moved to kilojoules to avoid this ambiguity entirely. In scientific papers, always check whether "calorie" means cal or kcal by looking at context and magnitude.
Historical Origin of the Calorie Units
Nicolas Clément introduced the "calorie" in 1824 as a unit of heat (originally the large calorie). In the late 1800s, chemists began using the small calorie (gram-calorie) for precision work. Wilbur Atwater adopted the large Calorie for nutrition in the 1890s. The dual usage persists today, causing confusion in textbooks and online resources.
When You Actually Need cal (Small Calories)
Small calories appear in: chemistry calorimetry problems, specific heat calculations (water = 1 cal/g°C), bond energy tables in older textbooks, and some physics thermodynamics problems. Modern SI practice prefers joules, but many textbooks still use calories for their intuitive connection to water heating.
Key Takeaways
- 1 kcal = 1000 cal (exactly).
- Food "Calories" (capital C) = kcal, not small cal.
- Multiply kcal by 1000 to get small calories.
- Small calories are used in chemistry; kcal in nutrition.
- The ambiguity is why many countries switched to kilojoules.
- Always check capitalization: Cal = kcal ≠ cal.
Kilocalorie to Calorie Conversion Formula
calorie = kilocalorie × 1000.0000000
1 kilocalorie = 1000.0000000 calorie
1 calorie = 0.0010000 kilocalorie
Reverse: kilocalorie = calorie × 0.0010000
Frequently Asked Questions
How many calorie are in 1 kilocalorie?
There are 1000.0000000 calorie in 1 kilocalorie. To convert kilocalorie to calorie, multiply the value by 1000.0000000.
How do I convert kilocalorie to calorie?
Multiply your kilocalorie value by 1000.0000000 to get the equivalent in calorie. For example, 5 kilocalorie = 5 × 1000.0000000 = 5000.00000 calorie.
How do I convert calorie to kilocalorie?
Multiply your calorie value by 0.0010000 to get the equivalent in kilocalorie. Alternatively, divide by 1000.0000000.
What is 10 kilocalorie in calorie?
10 kilocalorie is equal to 10000.00000 calorie.
What is 100 kilocalorie in calorie?
100 kilocalorie is equal to 100000.00000 calorie.