A kilocalorie is 1,000 calories.
Kilocalories to Decijoules Converter — kcal to dJ
Convert Kilocalorie (kcal) to Decijoule (dJ) using the exact conversion factor (1 kilocalorie = 41,840 decijoule). See the formula, worked examples, and conversion table.
Kilocalories to Decijoules 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.
Decijoule is 0.1 joule units.
Result = input x 4184 / 0.1.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilocalories to Decijoules
Kilocalorie and Decijoule 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 decijoule is 0.1 joule units.
Formula
decijoules = kilocalories × 41840
This factor comes from each unit's defined relationship to the category's base unit: 1 kilocalorie equals 4184 base units, and 1 decijoule equals 0.1 base units, so dividing one by the other gives the direct kilocalorie-to-decijoule factor of 41840.
Simple example
1 kcal × 41840 = 41,840 dJ
1 kilocalorie = 41,840 decijoules.
Real-world example
100 kcal × 41840 = 4,184,000 dJ
100 kilocalories = 4,184,000 decijoules.
Conversion table
| Kilocalorie (kcal) | Decijoule (dJ) |
|---|---|
| 1 kcal | 41,840 dJ |
| 10 kcal | 418,400 dJ |
| 50 kcal | 2,092,000 dJ |
| 100 kcal | 4,184,000 dJ |
| 500 kcal | 20,920,000 dJ |
| 1,000 kcal | 41,840,000 dJ |
Reverse conversion: Decijoule to Kilocalorie
1 dJ × 0.00002390057361 = 0.0000239006 kcal
1 decijoule = 0.0000239006 kilocalories.
kilocalories = decijoules × 0.0000239005736138
For a page dedicated to this direction, see Decijoule to Kilocalorie.
Understanding the Kilocalorie (kcal)
A kilocalorie is 1,000 calories.
Understanding the Decijoule (dJ)
Decijoule is 0.1 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many decijoules are in 1 kilocalorie?
1 kilocalorie equals 41,840 decijoules, using the exact defined conversion factor rather than an estimate.
How do I convert kilocalorie to decijoule?
Multiply the kilocalorie value by 41840. The converter above does this instantly to whatever precision you set.
How do I convert decijoule back to kilocalorie?
Use the reverse factor: 1 decijoule equals 0.0000239006 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 decijoule?
Decijoule (dJ) is a unit of engineering.
Is the kilocalorie to decijoule conversion exact?
Yes. Both kilocalorie and decijoule are defined by fixed standards rather than physical artifacts, so the factor of 41840 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.