How many kilojoules are in one small calorie?
One small calorie equals 0.004184 kilojoules.
Convert Calorie (cal) to Kilojoule (kJ) instantly.
Formula
value × 0.004184
| Sample | Converted |
|---|---|
| 1 cal | 0.004184 kJ |
| 5 cal | 0.02092 kJ |
| 10 cal | 0.04184 kJ |
| 100 cal | 0.4184 kJ |
| 1,000 cal | 4.184 kJ |
Convert small calories to kilojoules when a heat-energy value needs to be reported in the larger SI unit used for readable summaries.
Small calories are useful in detailed heat calculations, while kilojoules are easier to read for larger energy amounts.
The conversion follows the thermochemical relationship that one small calorie equals 4.184 joules.
A value of 250 cal equals 1.046 kJ.
Use kilojoules when the result needs to sit beside other SI energy values.
Keep the small-calorie source visible when working from older lab notes, because the unit label can be confused with food Calories.
For scientific writing, kJ is often clearer than a long string of small-calorie values.
Kilojoules provide a compact SI expression for energy values.
Small calories can become awkward when the number grows into hundreds or thousands.
Converting to kJ makes the result easier to compare with modern technical and educational material.
The abbreviation cal means small calorie on this page.
Nutrition Calories are normally kilocalories.
That distinction matters because a kilocalorie is 1000 times larger than a small calorie.
Use this conversion for chemistry, heat transfer, and older calorie-based examples.
Use kilojoules when preparing summaries or comparing with SI sources.
Round the final kJ value according to the precision of the original calorie measurement.
Definition: A small calorie is a heat-energy unit equal to 4.184 joules.
History/Origin: Calories were widely used for heat measurement before SI joules and kilojoules became standard in scientific reporting.
Current use: Small calories are used in chemistry examples, thermodynamics teaching, older references, and detailed heat calculations.
Definition: A kilojoule is an SI energy unit equal to 1000 joules.
History/Origin: Kilojoules became common as a readable SI scale for energy values larger than a few joules.
Current use: kJ is used in nutrition labeling, physics, heat transfer, mechanical work, engineering notes, and scientific summaries.
| Calorie [cal] | Kilojoule [kJ] |
|---|---|
| 0.01 cal | 0.000042 kJ |
| 0.1 cal | 0.000418 kJ |
| 1 cal | 0.004184 kJ |
| 2 cal | 0.008368 kJ |
| 5 cal | 0.02092 kJ |
| 10 cal | 0.04184 kJ |
| 20 cal | 0.08368 kJ |
| 50 cal | 0.2092 kJ |
| 100 cal | 0.4184 kJ |
1 cal = 0.004184 kJ
1 kJ = 239.005736 cal
Formula: value × 0.004184
Example: 15 cal = 0.06276 kJ
Precision note: Use 1 cal = 0.004184 kJ. Confirm that the source uses small calories, not kilocalories or nutrition Calories.
One small calorie equals 0.004184 kilojoules.
1000 small calories equals 4.184 kJ.
No. A food Calorie usually means a kilocalorie, which is 1000 small calories.