Calorie to Kilocalorie Converter

Enter the value that you want to convert calorie (cal) to kilocalorie (kcal) or kilocalorie to calorie.Also written as CAL to KCAL conversion.

1 calorie = 0.0010000 kilocalorie

Formula: kilocalorie = calorie value × 0.0010000

CAL to KCAL — calorie to kilocalorie

Value

cal

Result

0.01000kcal

10 calorie = 0.01000 kilocalorie

Popular Energy Converters:

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Why Convert Calorie to Kilocalorie?

About the Calorie

Calorie (cal) is a unit of energy measurement. 1 calorie is equal to 0.0010000 kilocalorie.

What is Kilocalorie?

Kilocalorie (kcal) is a unit of energy measurement. 1 kilocalorie is equal to 1000.0000000 calorie.

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.

calorie to kilocalorie metric conversion table

0.01 cal	=	0.00001 kcal
0.1 cal	=	0.00010 kcal
1 cal	=	0.00100 kcal
2 cal	=	0.00200 kcal
3 cal	=	0.00300 kcal
4 cal	=	0.00400 kcal
5 cal	=	0.00500 kcal
6 cal	=	0.00600 kcal
7 cal	=	0.00700 kcal
8 cal	=	0.00800 kcal
9 cal	=	0.00900 kcal
10 cal	=	0.01000 kcal
11 cal	=	0.01100 kcal
12 cal	=	0.01200 kcal
13 cal	=	0.01300 kcal
14 cal	=	0.01400 kcal
15 cal	=	0.01500 kcal
16 cal	=	0.01600 kcal
17 cal	=	0.01700 kcal
18 cal	=	0.01800 kcal

19 cal	=	0.01900 kcal
20 cal	=	0.02000 kcal
30 cal	=	0.03000 kcal
40 cal	=	0.04000 kcal
50 cal	=	0.05000 kcal
60 cal	=	0.06000 kcal
70 cal	=	0.07000 kcal
80 cal	=	0.08000 kcal
90 cal	=	0.09000 kcal
100 cal	=	0.10000 kcal
200 cal	=	0.20000 kcal
300 cal	=	0.30000 kcal
400 cal	=	0.40000 kcal
500 cal	=	0.50000 kcal
600 cal	=	0.60000 kcal
700 cal	=	0.70000 kcal
800 cal	=	0.80000 kcal
900 cal	=	0.90000 kcal
1000 cal	=	1.00000 kcal

How to Convert CAL to KCAL (Calorie to Kilocalorie)?

We can convert calorie to kilocalorie by using an example.

Example:

Convert 20 Calorie to Kilocalorie?

We know 1 Calorie = 0.0010000 kilocalorie; 1 Kilocalorie = 1000.0000000 calorie.

20 calorie = ___kcal

20 × 0.0010000 = 0.02000 kcal (we know 1 calorie = 0.0010000 kilocalorie)

Answer:

20 calorie = 0.02000 kilocalorie

How to Convert Calories to Kilocalories (Step-by-Step)

Converting small calories (cal) to kilocalories (kcal) is a straightforward division by 1000. This conversion bridges chemistry lab measurements to nutritional energy values used in food science.

Identify the energy value in small calories (cal or gram calories).
Divide by 1000 to convert to kilocalories (kcal).
The result represents food Calories (capital C).
Verify the magnitude makes sense in a nutrition context.

💡 Tip: If a chemistry problem gives you thousands of calories, dividing by 1000 gives the equivalent food Calorie count. For example, a 75,000 cal reaction equals the energy in a 75 kcal snack.

Common cal to kcal Conversions

Converting chemistry-scale calories to nutrition-scale kilocalories.

Calorie	Kilocalorie	Note
1000 cal	1 kcal	Definition: exactly 1 food Calorie
5000 cal	5 kcal	Energy to heat 5 kg water by 1°C
50,000 cal	50 kcal	Small piece of fruit
89,000 cal	89 kcal	Medium banana
200,000 cal	200 kcal	Typical snack bar
500,000 cal	500 kcal	Average meal
2,000,000 cal	2000 kcal	Daily reference intake

Solved Examples: cal to kcal Conversion

Question 1: A calorimetry experiment measures 45,200 cal released by burning a food sample. Express in kcal.

Solution:

Start with 45,200 cal.

Divide by 1000: 45,200 ÷ 1000 = 45.2 kcal.

The food sample contains about 45 food Calories per serving.

Answer: 45,200 cal = 45.2 kcal

Question 2: Heating 500 g of water from 20°C to 100°C requires 40,000 cal. Convert to kcal.

Solution:

Energy = mass × ΔT × specific heat = 500 × 80 × 1 = 40,000 cal.

Divide by 1000: 40,000 ÷ 1000 = 40 kcal.

This equals 40 food Calories — roughly the energy in 5 almonds.

Answer: 40,000 cal = 40 kcal

Question 3: A student reads "the activation energy is 15,800 cal/mol." Express in kcal/mol.

Solution:

Start with 15,800 cal/mol.

Divide by 1000: 15,800 ÷ 1000 = 15.8 kcal/mol.

This is a typical activation energy for organic reactions.

Answer: 15,800 cal/mol = 15.8 kcal/mol

Practice: cal to kcal Conversions

Try solving these on your own to test your understanding:

Convert 7500 cal to kcal. (Answer: 7.5 kcal)
A reaction releases 125,000 cal. How many kcal? (Answer: 125 kcal)
Convert 890 cal to kcal. (Answer: 0.89 kcal)
Burning 1 g of fat releases 9000 cal. Express in kcal. (Answer: 9 kcal)
A calorimeter reads 2,340,000 cal for a meal sample. Express in kcal. (Answer: 2340 kcal)

The Specific Heat Connection

The small calorie is defined by water's specific heat: 1 cal raises 1 gram of water by 1°C. This makes calorimetry calculations intuitive — just multiply mass (g) × temperature change (°C) to get energy in calories. Converting to kcal then gives the nutritional equivalent, connecting lab science to everyday food energy.

Bomb Calorimetry and Food Calories

Food scientists use bomb calorimeters to determine caloric content. A food sample is combusted in oxygen, and the heat released (measured in cal) warms a known mass of water. The result in cal is divided by 1000 to report kcal per gram. Atwater factors (4 kcal/g protein, 4 kcal/g carbs, 9 kcal/g fat) were derived from thousands of such measurements.

Key Takeaways

Divide small calories (cal) by 1000 to get kilocalories (kcal).
1 kcal = 1 food Calorie = 1000 small calories.
Chemistry uses cal; nutrition uses kcal (or Calories).
Bomb calorimetry bridges the two: raw data in cal, reported in kcal.
Atwater factors: protein/carbs = 4 kcal/g, fat = 9 kcal/g.
Always verify the scale — thousands of cal should be reported as kcal in food science.

Calorie to Kilocalorie Conversion Formula

kilocalorie = calorie × 0.0010000

1 calorie = 0.0010000 kilocalorie

1 kilocalorie = 1000.0000000 calorie

Reverse: calorie = kilocalorie × 1000.0000000

Frequently Asked Questions

How many kilocalorie are in 1 calorie?

There are 0.0010000 kilocalorie in 1 calorie. To convert calorie to kilocalorie, multiply the value by 0.0010000.

How do I convert calorie to kilocalorie?

Multiply your calorie value by 0.0010000 to get the equivalent in kilocalorie. For example, 5 calorie = 5 × 0.0010000 = 0.00500 kilocalorie.

How do I convert kilocalorie to calorie?

Multiply your kilocalorie value by 1000.0000000 to get the equivalent in calorie. Alternatively, divide by 0.0010000.

What is 10 calorie in kilocalorie?

10 calorie is equal to 0.01000 kilocalorie.

What is 100 calorie in kilocalorie?

100 calorie is equal to 0.10000 kilocalorie.