📏 Kilocalories to Kilojoules Converter
Convert kilocalories (kcal) to kilojoules (kJ) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 kilocalorie (food calorie) (kcal) = 4.184 kilojoules (kJ). Formula: kJ = kcal × 4.184.
Updated · Free · No sign-up · Works on any device
Kilocalories to Kilojoules Converter inputs
Result
Kilocalories to Kilojoules conversion table
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 0.1 kcal | 0.4184 kJ |
| 0.5 kcal | 2.092 kJ |
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 1,000 kcal | 4,184 kJ |
Other energy conversions
How to convert kilocalories to kilojoules
Multiply the number of kilocalories by 4.184 to get kilojoules: kJ = kcal × 4.184.
Example: 5 kcal = 20.92 kJ.
The kilocalorie (food calorie) (kcal) and the kilojoule (kJ) are both units of energy. Need the opposite direction? Use the kJ to kcal converter.
Popular conversions
Centimeter to InchInch to CentimeterFoot to MeterMeter to FootKilometer to MileMile to KilometerKilogram to PoundPound to KilogramCelsius to FahrenheitFahrenheit to CelsiusMilliliter to US cupUS cup to MilliliterLiter to US gallonUS gallon to LiterGram to OunceOunce to GramSquare foot to Square meterAcre to HectareKilometer per hour to Mile per hourMile per hour to Kilometer per hourMegabyte to GigabytePound per square inch to Bar
Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many kilojoules are in a kilocalorie (food calorie)?
1 kilocalorie (food calorie) = 4.184 kilojoules.
How do I convert kilocalories to kilojoules?
Use the formula kJ = kcal × 4.184. For example, 5 kcal = 20.92 kJ.
How do I convert kilojoules back to kilocalories?
1 kilojoule = 0.23900574 kilocalories. Use the kJ to kcal converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.