Kilojoules to Kilocalories (kJ to kcal) Online Converter

This online converter allows you to easily convert energy values between kilojoules (kJ) and kilocalories (kcal). It is an essential tool for those involved in nutrition, fitness, and health-related fields where energy intake and expenditure are tracked. The converter works both ways, allowing you to enter a value in kilojoules to get the equivalent in kilocalories or vice versa.

Kilojoules to Kilocalories Converter

This converter automatically converts between kilojoules (kJ) and kilocalories (kcal) both ways. You can also set the number of decimal places to round the results.

Kilojoules (kJ): Kilocalories (kcal):

Decimal Places (0 to 10):

How to Use the Converter

Simply input the value you want to convert into the relevant field—either kilojoules or kilocalories. The converter will automatically calculate and display the equivalent value in the other unit. If you wish to reverse the conversion, just enter the value in the other input field, and the calculation will update accordingly. Hit the Clear All button to erase all the values you’ve entered.

Formula Used

The conversion formula from kilojoules to kilocalories is:

Kilocalories (kcal) = Kilojoules (kJ) × 0.239006

For converting kilocalories back to kilojoules, divide the kilocalories by 0.239006.

Precalculated Values

Here are some common real-world conversions:

100 kJ = 23.9006 kcal (approximately a small apple)
200 kJ = 47.8012 kcal (around a slice of bread)
500 kJ = 119.503 kcal (a small chocolate bar)
1000 kJ = 239.006 kcal (a moderate-sized meal)
2000 kJ = 478.012 kcal (a larger meal, such as a burger and fries)
5000 kJ = 1195.03 kcal (a full day’s moderate caloric intake)
10000 kJ = 2390.06 kcal (close to a full day’s high-calorie diet)

History and Interesting Facts

The joule is named after James Prescott Joule, an English physicist who studied the nature of heat and discovered its relationship to mechanical work. The calorie, on the other hand, has its roots in the Latin word “calor,” meaning heat. The kilocalorie, often referred to simply as a “calorie” in food labeling, is a measure of energy used widely in nutrition.

Understanding the relationship between kilojoules and kilocalories is crucial, especially in countries like Australia and New Zealand, where energy content is typically listed in kilojoules, while in the United States and other parts of the world, kilocalories are more commonly used.