How many calories are in 1 kilojoule?

1 kilojoule equals 239.006 cal.

How do I convert calories back to kilojoules?

Use the reverse converter: 1 calorie equals 0.004184 kJ.

Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.

To convert kilojoules to calories, multiply the value by 239.005736.

cal = kJ × 239.005736

40 kJ × 239.005736 = 9560.23 cal

Kilojoule (kJ): 1,000 joules; used for food energy in Australia, New Zealand and much of Europe.
Calorie (cal): The thermochemical calorie is exactly 4.184 joules, historically the heat to warm one gram of water by 1 °C.

How do I convert kilojoules to calories?: To convert kilojoules to calories, multiply the value by 239.005736.
How many calories are in 1 kilojoule?: 1 kilojoule equals 239.006 cal.
How many calories are in 10 kilojoules?: 10 kJ equals 2390.06 cal.
How do I convert calories back to kilojoules?: Use the reverse converter: 1 calorie equals 0.004184 kJ.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.