Kilocalories to Megajoules
Convert kilocalories to megajoules instantly. 1 kcal = 0.004184 MJ. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert kilocalories to megajoules
To convert kilocalories to megajoules, divide by 239.0057361377 (multiply by 0.004184). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
MJ = kcal × 0.004184
Kilocalories to Megajoules conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Kilocalories | Megajoules |
|---|---|
| 1 kcal | 0.004184 MJ |
| 2 kcal | 0.008368 MJ |
| 3 kcal | 0.012552 MJ |
| 5 kcal | 0.02092 MJ |
| 10 kcal | 0.04184 MJ |
| 20 kcal | 0.08368 MJ |
| 25 kcal | 0.1046 MJ |
| 50 kcal | 0.2092 MJ |
| 100 kcal | 0.4184 MJ |
| 500 kcal | 2.092 MJ |
| 1,000 kcal | 4.184 MJ |
What is a kilocalory?
The food Calorie, equal to a thousand small calories.
What is a megajoule?
A million joules, used for fuel energy content and gas billing.
The formula
MJ = kcal × 0.004184
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Kilocalories to Megajoules
- Type the number of kilocalories you want to convert.
- Read the result in megajoules straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked megajoules to kilocalories page.
Kilocalories to Megajoules — frequently asked questions
How many megajoules are in a kilocalory?
One kilocalory equals 0.004184 MJ. MJ = kcal × 0.004184
What is the formula to convert kilocalories to megajoules?
The formula is MJ = kcal × 0.004184. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert megajoules back to kilocalories?
Divide instead of multiplying: one megajoule is 239.0057361377 kcal. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this kilocalories to megajoules free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the kilocalories to megajoules.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error