Megajoule is 1000000 joule units.
Megajoules to Kilocalories Converter — MJ to kcal
Convert Megajoule (MJ) to Kilocalorie (kcal) using the exact conversion factor (1 megajoule = 239.0057361 kilocalorie). See the formula, worked examples, and conversion table.
Megajoules to Kilocalories converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
A kilocalorie is 1,000 calories.
Result = input x 1e+6 / 4184.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Megajoules to Kilocalories
Megajoule and Kilocalorie both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Megajoule is 1000000 joule units, and a kilocalorie is 1,000 calories.
Formula
kilocalories = megajoules × 239.005736138
This factor comes from each unit's defined relationship to the category's base unit: 1 megajoule equals 1000000 base units, and 1 kilocalorie equals 4184 base units, so dividing one by the other gives the direct megajoule-to-kilocalorie factor of 239.005736138.
Simple example
1 MJ × 239.0057361 = 239.0057361 kcal
1 megajoule = 239.0057361 kilocalories.
Real-world example
100 MJ × 239.0057361 = 23,900.57361 kcal
100 megajoules = 23,900.57361 kilocalories.
Conversion table
| Megajoule (MJ) | Kilocalorie (kcal) |
|---|---|
| 1 MJ | 239.0057361 kcal |
| 10 MJ | 2,390.057361 kcal |
| 50 MJ | 11,950.28681 kcal |
| 100 MJ | 23,900.57361 kcal |
| 500 MJ | 119,502.8681 kcal |
| 1,000 MJ | 239,005.7361 kcal |
Reverse conversion: Kilocalorie to Megajoule
239.0057361 kcal × 0.004184 = 0.9999999998 MJ
239.0057361 kilocalories = 0.9999999998 megajoules.
megajoules = kilocalories × 0.004184
For a page dedicated to this direction, see Kilocalorie to Megajoule.
Understanding the Megajoule (MJ)
Megajoule is 1000000 joule units.
Understanding the Kilocalorie (kcal)
A kilocalorie is 1,000 calories.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilocalories are in 1 megajoule?
1 megajoule equals 239.0057361 kilocalories, using the exact defined conversion factor rather than an estimate.
How do I convert megajoule to kilocalorie?
Multiply the megajoule value by 239.0057361. The converter above does this instantly to whatever precision you set.
How do I convert kilocalorie back to megajoule?
Use the reverse factor: 1 kilocalorie equals 0.004184 megajoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a megajoule?
Megajoule (MJ) is a unit of engineering.
What is a kilocalorie?
Kilocalorie (kcal) is a unit of engineering.
Is the megajoule to kilocalorie conversion exact?
Yes. Both megajoule and kilocalorie are defined by fixed standards rather than physical artifacts, so the factor of 239.0057361 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.