Calories to Kilojoules Table: Kilojoules by Calories (kcal)
Reference table of kilojoules for Calories to Kilojoules across a range of calories (kcal) values — exact, engine-computed figures you can read off at a glance.
Calories to Kilojoules Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Kilojoules
418.40
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Calories to Kilojoules Calculator
The Calories to Kilojoules Calculator works out your kilojoules in an instant. Enter calories (kcal) 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.
- Enter the calories (kcal).
- Read off your kilojoules — the calculator updates automatically, with no button to press.
Formula
The Calories to Kilojoules Calculator uses the formula:
Kilojoules = Calories (kcal) × 4.184
Worked example
For example, with calories (kcal) of 100, the kilojoules is 418.40.
| Calories (kcal) | 100 |
|---|
| Kilojoules | 418.40 |
|---|
Results are estimates for educational use, not professional advice.
Frequently asked questions
Multiply calories by 4.184. 100 kcal is about 418 kJ.
Yes. The 'calories' on food labels are kilocalories (kcal), each equal to 1000 small calories.
Many countries show both kcal and kJ; this helps convert between them.
Divide kilojoules by 4.184 to return to kcal.
The Calories to Kilojoules Calculator uses the formula: Kilojoules = Calories (kcal) × 4.184. For example, with calories (kcal) of 100, the kilojoules is 418.40.
Enter the calories (kcal). Read off your kilojoules — the calculator updates automatically, with no button to press.
Related guides
How to Calculate Calories to Kilojoules: Formula, Steps & Examples
Learn how to calculate Calories to Kilojoules — the formula explained step by step, with worked examples and a free calculator to check your answer.