How many kilocalories are in 1 joule?

1 joule equals 0.000239006 kcal.

How do I convert kilocalories back to joules?

Use the reverse converter: 1 kilocalorie equals 4184 J.

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

To convert joules to kilocalories, multiply the value by 0.000239005736.

kcal = J × 0.000239005736

40 J × 0.000239005736 = 0.00956 kcal

Joule (J): The SI unit of energy, one newton-metre, named after James Prescott Joule.
Kilocalorie (kcal): The "food calorie" on nutrition labels. Equal to 4,184 joules.

How do I convert joules to kilocalories?: To convert joules to kilocalories, multiply the value by 0.000239005736.
How many kilocalories are in 1 joule?: 1 joule equals 0.000239006 kcal.
How many kilocalories are in 10 joules?: 10 J equals 0.00239006 kcal.
How do I convert kilocalories back to joules?: Use the reverse converter: 1 kilocalorie equals 4184 J.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.