How many kilojoules are in one kilocalorie?
One kilocalorie equals 4.184 kilojoules.
Convert Kilocalorie (kcal) to Kilojoule (kJ) instantly.
Formula
value × 4.184
| Sample | Converted |
|---|---|
| 1 kcal | 4.184 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 100 kcal | 418.4 kJ |
| 1,000 kcal | 4,184 kJ |
Convert kilocalories to kilojoules when food energy or larger heat values need to be shown in the SI unit commonly used on nutrition labels and technical summaries.
Kilocalories are familiar in nutrition, while kilojoules are the SI-style energy unit used on many food labels.
The conversion uses the fixed relationship that one kilocalorie equals 4.184 kJ.
A value of 250 kcal equals 1046 kJ.
Use kJ when matching international labels or SI-based reporting.
Use kcal when readers expect food Calories or fitness app values.
Because nutrition data is often rounded by serving size, converted totals may differ slightly from printed label values.
Many nutrition labels show energy in kilojoules, kilocalories, or both.
Converting kcal to kJ helps compare foods, meals, and exercise estimates across regions.
The result is especially useful when a source only lists Calories but another tool expects kilojoules.
One kilocalorie equals 4.184 kilojoules.
Multiplication is all that is needed for the conversion.
The factor is exact for this converter, while source nutrition values may still be rounded estimates.
Kilojoules align better with SI reporting.
Kilocalories are still widely recognized by consumers.
Showing both can make nutrition information easier for different readers to understand.
Definition: A kilocalorie is an energy unit equal to 1000 small calories or 4184 joules.
History/Origin: Kilocalories became a standard practical unit for food energy and nutrition reporting.
Current use: kcal is used in food labels, diet tracking, exercise estimates, meal planning, and consumer nutrition tools.
Definition: A kilojoule is an SI energy unit equal to 1000 joules.
History/Origin: Kilojoules became common in nutrition and science as SI-based energy reporting expanded.
Current use: kJ is used on food labels, in physics, heat transfer, mechanical work, engineering documentation, and scientific summaries.
| Kilocalorie [kcal] | Kilojoule [kJ] |
|---|---|
| 0.01 kcal | 0.04184 kJ |
| 0.1 kcal | 0.4184 kJ |
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 5 kcal | 20.92 kJ |
| 10 kcal | 41.84 kJ |
| 20 kcal | 83.68 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
1 kcal = 4.184 kJ
1 kJ = 0.239006 kcal
Formula: value × 4.184
Example: 15 kcal = 62.76 kJ
Precision note: Use 1 kcal = 4.184 kJ. Round final nutrition values to a practical number of digits, especially when the source label is already rounded.
One kilocalorie equals 4.184 kilojoules.
100 kcal equals 418.4 kJ.
In common nutrition use, yes. A food Calorie usually means one kilocalorie.