How do I convert joules back to kilocalories?

Use the reverse converter: 1 joule equals 0.000239006 kcal.

Is this converter accurate?

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

To convert kilocalories to joules, multiply the value by 4184.

J = kcal × 4184

40 kcal × 4184 = 167360 J

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

How do I convert kilocalories to joules?: To convert kilocalories to joules, multiply the value by 4184.
How many joules are in 1 kilocalorie?: 1 kilocalorie equals 4184 J.
How many joules are in 10 kilocalories?: 10 kcal equals 41840 J.
How do I convert joules back to kilocalories?: Use the reverse converter: 1 joule equals 0.000239006 kcal.
Is this converter accurate?: Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.