Effortlessly convert kilojoules to kilocalories and vice versa with Examples.com. Enter your data for quick, accurate conversions.

Conversion Factors:

  • Kilojoules to Kilocalories: 1 kilocalorie = 4.184 kilojoules
  • Kilocalories to Kilojoules: 1 kilojoule = 1/4.184 kilocalories

How to Convert Kilojoules to Kilocalories:

To convert kilojoules to kilocalories, divide the number of kilojoules by 4.184.

Kilocalories (kcal) =Kilojoules (kJ)/4.184

Example: Convert 2000 kilojoules to kilocalories.

Kilocalories = 2000 kJ/4.184 = 478.68 kcal

How to Convert Kilocalories to Kilojoules:

To convert kilocalories to kilojoules, multiply the number of kilocalories by 4.184.

Kilojoules (kJ) = Kilocalories (kcal)×4.184

Example: Convert 3 kilocalories to kilojoules.

Kilojoules = 3 kcal×4.184 = 12.552 kJ

Kilojoules to Kilocalories Conversion Table

Kilojoules (kJ)Kilocalories (kcal)
1 kJ0.239 kcal
2 kJ0.478 kcal
3 kJ0.717 kcal
4 kJ0.956 kcal
5 kJ1.195 kcal
6 kJ1.434 kcal
7 kJ1.673 kcal
8 kJ1.912 kcal
9 kJ2.151 kcal
10 kJ2.390 kcal
20 kJ4.780 kcal
30 kJ7.170 kcal
40 kJ9.560 kcal
50 kJ11.950 kcal
60 kJ14.340 kcal
70 kJ16.730 kcal
80 kJ19.120 kcal
90 kJ21.510 kcal
100 kJ23.900 kcal

Kilocalories to Kilojoules Conversion Table

Kilocalories (kcal)Kilojoules (kJ)
1 kcal4.184 kJ
2 kcal8.368 kJ
3 kcal12.552 kJ
4 kcal16.736 kJ
5 kcal20.920 kJ
6 kcal25.104 kJ
7 kcal29.288 kJ
8 kcal33.472 kJ
9 kcal37.656 kJ
10 kcal41.840 kJ
20 kcal83.680 kJ
30 kcal125.520 kJ
40 kcal167.360 kJ
50 kcal209.200 kJ
60 kcal251.040 kJ
70 kcal292.880 kJ
80 kcal334.720 kJ
90 kcal376.560 kJ
100 kcal418.400 kJ

Difference Between Kilojoules to Kilocalories

AspectKilojoules (kJ)Kilocalories (kcal)
Unit of MeasurementKilojoule is a unit of energy in the metric system.Kilocalorie is a unit of energy in the metric system, commonly used in nutrition.
SymbolRepresented by “kJ”.Represented by “kcal”.
Conversion Factor1 kilojoule = 0.239 kilocalories.1 kilocalorie = 4.184 kilojoules.
Common UseWidely used in scientific contexts and in most countries to express energy values.Commonly used in nutrition to indicate the energy content in food.
Global PreferencePreferred in many countries for energy-related measurements, especially in scientific literature.Often used in the United States and some other countries for food energy values.
Energy ExpressionExpresses energy in joules (1 kilojoule = 1000 joules).Expresses energy in terms of calories (1 kilocalorie = 1000 calories).
Nutritional LabelingSeen on food packaging in countries using the metric system, e.g., Australia, New Zealand.Seen on food packaging, particularly in the United States.
Historical ContextPart of the International System of Units (SI), adopted globally for various scientific measures.Originates from the concept of calorie used to measure heat energy in food.

1. Solved Examples on Converting Kilojoules to Kilocalories

Example 1:

Convert 50 kilojoules to kilocalories.

Kilocalories (kcal) = Kilojoules (kJ)/4.184

Calculation: Kilocalories = 50 kJ/4.184 = 11.95 kcal

Example 2:

Convert 120 kilojoules to kilocalories.

Calculation: Kilocalories = 120 kJ/4.184 = 28.68 kcal

Example 3:

Convert 250 kilojoules to kilocalories.

Calculation: Kilocalories = 250 kJ/4.184 = 59.75 kcal

Example 4:

Convert 360 kilojoules to kilocalories.

Calculation: Kilocalories = 360 kJ/4.184 = 86.06 kcal

Example 5:

Convert 500 kilojoules to kilocalories.

Calculation: Kilocalories = 500 kJ4.184 = 119.47 kcal

2. Solved Examples on Converting Kilocalories to Kilojoules

Example 1:

Convert 10 kilocalories to kilojoules.

Kilojoules (kJ) = Kilocalories (kcal)×4.184

Calculation: Kilojoules = 10 kcal×4.184 = 41.84 kJ

Example 2:

Convert 25 kilocalories to kilojoules.

Calculation: Kilojoules = 25 kcal×4.184 = 104.60 kJ

Example 3:

Convert 50 kilocalories to kilojoules.

Calculation: Kilojoules = 50 kcal×4.184 = 209.20 kJ

Example 4:

Convert 75 kilocalories to kilojoules.

Calculation: Kilojoules = 75 kcal×4.184 = 313.80 kJ

Example 5:

Convert 100 kilocalories to kilojoules.

Calculation: Kilojoules = 100 kcal×4.184 = 418.40 kJ

How accurate is the conversion between kilojoules and kilocalories?

The conversion is accurate as per the defined conversion factor, 1 kilocalorie = 4.184 kilojoules. Calculations based on this factor are precise and reliable.

Why do we use kilojoules and kilocalories?

Kilojoules and kilocalories are both units of energy. Kilojoules are commonly used in scientific contexts and in most countries to express energy values, while kilocalories are commonly used in nutrition to indicate the energy content in food, especially in the United States.

Is the term “calorie” the same as “kilocalorie”?

In nutritional contexts, “calorie” often refers to a kilocalorie (kcal), which is equal to 1,000 small calories (cal). The term kilocalorie is more precise but is commonly abbreviated to calorie in everyday use.

What is the importance of converting kilojoules to kilocalories?

Converting kilojoules to kilocalories is important for understanding nutritional information on food labels, especially when comparing energy content across different measurement systems. It helps in making informed dietary choices based on familiar units.

Are kilojoules and kilocalories interchangeable in recipes?

When following recipes, it’s important to use the specified unit of measurement to ensure accuracy. If a recipe lists energy content in kilojoules, you can convert it to kilocalories if needed, and vice versa, using the conversion factor.