Kilocalorie to KilojouleConverter
Instantly convert Kilocalorie (kcal) to Kilojoule (kJ). Free, accurate, and easy to use.
How to Convert Kilocalorie to Kilojoule
To convert Kilocalorie (kcal) to Kilojoule (kJ), multiply your value by 4.184.
Example: 5 kcal × 4.184 = 20.92 kJ
What is a Kilocalorie?
The kilocalorie (kcal) equals 1,000 gram calories or approximately 4,184 Joules, and appears on food nutrition labels worldwide as 'Calories' (with a capital C) in the United States. An average adult diet of 2,000–2,500 kcal per day supplies about 8,370–10,460 kJ. Resting metabolic rate consumes approximately 60–80 kcal per hour. Running burns roughly 600–900 kcal per hour depending on pace and body weight.
What is a Kilojoule?
The kilojoule equals 1,000 Joules and is used on food nutrition labels in many countries — particularly in Europe, Australia, and Canada — as an alternative to calories. One kilocalorie (food Calorie) equals 4.184 kilojoules. A typical adult requires approximately 8,000–10,000 kJ of dietary energy per day. Running at moderate pace for one hour burns roughly 2,000–3,000 kJ.
Kilocalorie to Kilojoule Conversion Table
| Kilocalorie (kcal) | Kilojoule (kJ) |
|---|---|
| 0.001 kcal | 0.004184 kJ |
| 0.01 kcal | 0.04184 kJ |
| 0.1 kcal | 0.4184 kJ |
| 0.5 kcal | 2.092 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 |
| 200 kcal | 836.8 kJ |
| 500 kcal | 2092 kJ |
| 1000 kcal | 4184 kJ |
| 5000 kcal | 20920 kJ |
| 10000 kcal | 41840 kJ |
| 50000 kcal | 209200 kJ |
| 100000 kcal | 418400 kJ |
| 1000000 kcal | 4184000 kJ |
| 1000000000 kcal | 4.1840e+9 kJ |
Frequently Asked Questions
How do I convert Kilocalorie to Kilojoule?
Multiply the Kilocalorie value by 4.184. Formula: kJ = kcal × 4.184. Example: 10 kcal = 41.84 kJ.
How many Kilojoule are in one Kilocalorie?
One Kilocalorie (kcal) equals 4.184 Kilojoule (kJ).
How many Kilocalorie are in one Kilojoule?
One Kilojoule (kJ) equals 0.23900574 Kilocalorie (kcal).
What is the exact conversion factor from Kilocalorie to Kilojoule?
The conversion factor is 4.184. Multiply any kcal value by this number to get kJ. For the reverse, multiply by 0.23900574.
How do I convert Kilojoule back to Kilocalorie?
Divide by 4.184, or equivalently multiply by 0.23900574. Formula: kcal = kJ ÷ 4.184.
Is the Kilocalorie-to-Kilojoule conversion internationally standardized?
Yes. Both units are defined by international standards (SI or the international yard/pound agreement), so the conversion factor 4.184 is exact and universally agreed upon.