Calories to Kilojoules Converter

Calories to Kilojoules Converter

Kilojoules
—
Joules
—
1 kcal = 4.184 kJ · 1 kcal = 4184 J

How to convert calories to kilojoules

To convert kilocalories (food Calories) to kilojoules, multiply by 4.184. For example, 200 kcal × 4.184 = 836.8 kJ. Going the other way, divide kilojoules by 4.184 to get kilocalories.

To convert kilocalories to joules, multiply by 4184. So 100 kcal × 4184 = 418,400 joules.

1 kcal = 4.184 kJ = 4184 J. Food labels in Australia and Europe show kilojoules while US labels show Calories (kcal). The average daily intake is 2000 kcal = 8368 kJ.

Calories to kilojoules conversion table

Calories (kcal) Kilojoules (kJ) Common reference
50 kcal209.2 kJsmall fruit
100 kcal418.4 kJsmall snack
200 kcal836.8 kJchocolate bar
300 kcal1255.2 kJlight meal
500 kcal2092 kJmedium meal
800 kcal3347.2 kJlarge meal
1000 kcal4184 kJhalf daily intake
2000 kcal8368 kJdaily intake

Frequently asked questions

How many kJ is 1 Calorie?
1 food Calorie (kcal) = 4.184 kJ = 4184 J. To convert kcal to kJ always multiply by 4.184.
How many kJ is 2000 Calories?
2000 kcal = 8368 kJ. This is the average recommended daily energy intake for adults.
How many calories is 8700 kJ?
8700 kJ = 2079.4 kcal. This is the average daily recommended intake used on Australian food labels.
How many kJ is 500 Calories?
500 kcal = 2092 kJ. Calculation: 500 × 4.184 = 2092 kJ.
What is the difference between calories and kilocalories?
Food Calories (with capital C) are kilocalories (kcal). 1 food Calorie = 1 kcal = 1000 small calories. Food labels always use kilocalories not small calories.