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Kilojoules to Calories Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
Verified formula Private

Calories (kcal)

100.00

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Kilojoules to Calories Calculator

The Kilojoules to Calories Calculator works out your calories (kcal) in an instant. Enter kilojoules and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the kilojoules.
  2. Read off your calories (kcal) — the calculator updates automatically, with no button to press.

Formula

The Kilojoules to Calories Calculator uses the formula:

Calories (kcal) = Kilojoules ÷ 4.184

Worked example

For example, with kilojoules of 418.4, the calories (kcal) is 100.00.

Inputs used
Kilojoules 418.4
Results
Calories (kcal) 100.00

Results are estimates for educational use, not professional advice.

Frequently asked questions

Divide kilojoules by 4.184. 418.4 kJ is about 100 kcal.

One calorie equals 4.184 joules, so one kcal equals 4.184 kJ.

Yes. Food 'calories' are kilocalories, the kcal value this returns.

Multiply calories by 4.184.

The Kilojoules to Calories Calculator uses the formula: Calories (kcal) = Kilojoules ÷ 4.184. For example, with kilojoules of 418.4, the calories (kcal) is 100.00.

Enter the kilojoules. Read off your calories (kcal) — the calculator updates automatically, with no button to press.

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