How many kilocalories are in one joule?

One joule equals 0.000239 kcal. The formula is kcal = J × 0.000239.

How do I convert joules to kilocalories?

Multiply the value in joules by 0.000239. For example, 100 × 0.000239 = 0.023901 — so 100 J = 0.023901 kcal.

How many joules are in one kilocalorie?

One kilocalorie equals 4,184 J.

Pair · linear · factor 0.000239

joules to kilocalories

Jkcal

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joules · ≈ 100 J (base)

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Frequently asked questions

A glowing emerald doughnut with a battery-and-lightning symbol at its centre, wrapped in a geometric grid, against a cosmic nebula in violet and magenta

Energy

How much energy is in a doughnut — calories, joules and kilowatt-hours

A calorie on your plate, a joule in the lab and a kilowatt-hour on your electricity bill all describe exactly the same thing: the ability to do work. One traditional doughnut holds about 407 watt-hours of energy — enough to run an efficient LED for more than a day, or charge a smartphone nearly 24 times. Here is how a single pastry ties together nutrition, physics and your power bill.

13 min