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About this tool
Convert megajoules to kilocalories instantly. Free, bidirectional, and fully in-browser.
1 megajoule equals 239.0057361 kilocalories — enter any megajoule value to convert it to kilocalories instantly. This Megajoule to Kilocalorie converter is a client-side tool: it applies a single multiplication (kcal = MJ × 239.0057361) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert kilocalories back to megajoules. A reference table lists common megajoule values already converted, and nothing you enter is sent to a server.
Open Megajoule to Kilocalorie Converter on AltFTool — it loads instantly in your browser.
Type the value you want to convert into the Megajoule field.
Read the equivalent in kilocalories in the result field, and copy it if needed.
Use the decimal-places slider for more or less precision, or press swap to convert kilocalories to megajoules.
The result updates as you type, and the swap button flips the conversion to kilocalorie → megajoule without reloading.
The conversion uses the precise factor (kcal = MJ × 239.0057361), so the number matches a manual calculation to the decimal places you choose.
A slider sets 0–10 decimal places, and very small or very large results switch to scientific notation instead of rounding to zero.
Everything runs locally in your browser — no upload, no account, no limit on conversions.
One megajoule is 239.0057361 kilocalories. Multiply the megajoule value by 239.0057361 to convert. For example, 10 MJ = 2390.057361 kcal.
kcal = MJ × 239.0057361. This tool applies it automatically and shows a worked example: 10 MJ = 2390.057361 kcal.
Yes. Press the swap button, or type into the kilocalorie field, and the tool converts kilocalories to megajoules using the inverse of the same relationship.
It uses the standard energy and work definition (kcal = MJ × 239.0057361), not a rounded approximation, so results are exact to the number of decimal places you select.
Yes. The converter is a browser-side script with no network calls: your values are never uploaded, and once the page has loaded it keeps working without a connection.
Add the Megajoule to Kilocalorie Converter widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.
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