Kilocalorie to JouleConverter
Instantly convert Kilocalorie (kcal) to Joule (J). Free, accurate, and easy to use.
How to Convert Kilocalorie to Joule
To convert Kilocalorie (kcal) to Joule (J), multiply your value by 4184.
Example: 5 kcal × 4184 = 20920 J
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 Joule?
The Joule (J) is the SI unit of energy, defined as the work done when a force of 1 Newton moves an object 1 meter. Named after 19th-century physicist James Prescott Joule, who established the mechanical equivalent of heat, it is the universal unit for all energy forms in science. Lifting a 100-gram apple one meter requires approximately 1 Joule. One food Calorie (kcal) equals 4,184 Joules.
Kilocalorie to Joule Conversion Table
| Kilocalorie (kcal) | Joule (J) |
|---|---|
| 0.001 kcal | 4.184 J |
| 0.01 kcal | 41.84 J |
| 0.1 kcal | 418.4 J |
| 0.5 kcal | 2092 J |
| 1 kcal | 4184 J |
| 2 kcal | 8368 J |
| 5 kcal | 20920 J |
| 10 kcal | 41840 J |
| 20 kcal | 83680 J |
| 50 kcal | 209200 J |
| 100 kcal | 418400 J |
| 200 kcal | 836800 J |
| 500 kcal | 2092000 J |
| 1000 kcal | 4184000 J |
| 5000 kcal | 20920000 J |
| 10000 kcal | 41840000 J |
| 50000 kcal | 209200000 J |
| 100000 kcal | 418400000 J |
| 1000000 kcal | 4.1840e+9 J |
| 1000000000 kcal | 4.1840e+12 J |
Frequently Asked Questions
How do I convert Kilocalorie to Joule?
Multiply the Kilocalorie value by 4184. Formula: J = kcal × 4184. Example: 10 kcal = 41840 J.
How many Joule are in one Kilocalorie?
One Kilocalorie (kcal) equals 4184 Joule (J).
How many Kilocalorie are in one Joule?
One Joule (J) equals 0.00023901 Kilocalorie (kcal).
What is the exact conversion factor from Kilocalorie to Joule?
The conversion factor is 4184. Multiply any kcal value by this number to get J. For the reverse, multiply by 0.00023901.
How do I convert Joule back to Kilocalorie?
Divide by 4184, or equivalently multiply by 0.00023901. Formula: kcal = J ÷ 4184.
Is the Kilocalorie-to-Joule conversion internationally standardized?
Yes. Both units are defined by international standards (SI or the international yard/pound agreement), so the conversion factor 4184 is exact and universally agreed upon.