A kilocalorie is 1,000 calories.
Kilocalories to Decajoules Converter — kcal to daJ
Convert Kilocalorie (kcal) to Decajoule (daJ) using the exact conversion factor (1 kilocalorie = 418.4 decajoule). See the formula, worked examples, and conversion table.
Kilocalories to Decajoules 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.
Decajoule is 10 joule units.
Result = input x 4184 / 10.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilocalories to Decajoules
Kilocalorie and Decajoule 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: A kilocalorie is 1,000 calories, and decajoule is 10 joule units.
Formula
decajoules = kilocalories × 418.4
This factor comes from each unit's defined relationship to the category's base unit: 1 kilocalorie equals 4184 base units, and 1 decajoule equals 10 base units, so dividing one by the other gives the direct kilocalorie-to-decajoule factor of 418.4.
Simple example
1 kcal × 418.4 = 418.4 daJ
1 kilocalorie = 418.4 decajoules.
Real-world example
100 kcal × 418.4 = 41,840 daJ
100 kilocalories = 41,840 decajoules.
Conversion table
| Kilocalorie (kcal) | Decajoule (daJ) |
|---|---|
| 1 kcal | 418.4 daJ |
| 10 kcal | 4,184 daJ |
| 50 kcal | 20,920 daJ |
| 100 kcal | 41,840 daJ |
| 500 kcal | 209,200 daJ |
| 1,000 kcal | 418,400 daJ |
Reverse conversion: Decajoule to Kilocalorie
418.4 daJ × 0.002390057361 = 1 kcal
418.4 decajoules = 1 kilocalorie.
kilocalories = decajoules × 0.00239005736138
For a page dedicated to this direction, see Decajoule to Kilocalorie.
Understanding the Kilocalorie (kcal)
A kilocalorie is 1,000 calories.
Understanding the Decajoule (daJ)
Decajoule is 10 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many decajoules are in 1 kilocalorie?
1 kilocalorie equals 418.4 decajoules, using the exact defined conversion factor rather than an estimate.
How do I convert kilocalorie to decajoule?
Multiply the kilocalorie value by 418.4. The converter above does this instantly to whatever precision you set.
How do I convert decajoule back to kilocalorie?
Use the reverse factor: 1 decajoule equals 0.0023900574 kilocalories. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilocalorie?
Kilocalorie (kcal) is a unit of engineering.
What is a decajoule?
Decajoule (daJ) is a unit of engineering.
Is the kilocalorie to decajoule conversion exact?
Yes. Both kilocalorie and decajoule are defined by fixed standards rather than physical artifacts, so the factor of 418.4 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.