Joule to KilocalorieConverter
Instantly convert Joule (J) to Kilocalorie (kcal). Free, accurate, and easy to use.
How to Convert Joule to Kilocalorie
To convert Joule (J) to Kilocalorie (kcal), multiply your value by 0.00023901.
Example: 5 J × 0.00023901 = 0.00119503 kcal
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.
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.
Joule to Kilocalorie Conversion Table
| Joule (J) | Kilocalorie (kcal) |
|---|---|
| 0.001 J | 2.3901e-7 kcal |
| 0.01 J | 0.00000239 kcal |
| 0.1 J | 0.0000239 kcal |
| 0.5 J | 0.0001195 kcal |
| 1 J | 0.00023901 kcal |
| 2 J | 0.00047801 kcal |
| 5 J | 0.00119503 kcal |
| 10 J | 0.00239006 kcal |
| 20 J | 0.00478011 kcal |
| 50 J | 0.01195029 kcal |
| 100 J | 0.02390057 kcal |
| 200 J | 0.04780115 kcal |
| 500 J | 0.11950287 kcal |
| 1000 J | 0.23900574 kcal |
| 5000 J | 1.19502868 kcal |
| 10000 J | 2.39005736 kcal |
| 50000 J | 11.95028681 kcal |
| 100000 J | 23.90057361 kcal |
| 1000000 J | 239.00573614 kcal |
| 1000000000 J | 239005.73613767 kcal |
Frequently Asked Questions
How do I convert Joule to Kilocalorie?
Multiply the Joule value by 0.00023901. Formula: kcal = J × 0.00023901. Example: 10 J = 0.00239006 kcal.
How many Kilocalorie are in one Joule?
One Joule (J) equals 0.00023901 Kilocalorie (kcal).
How many Joule are in one Kilocalorie?
One Kilocalorie (kcal) equals 4184 Joule (J).
What is the exact conversion factor from Joule to Kilocalorie?
The conversion factor is 0.00023901. Multiply any J value by this number to get kcal. For the reverse, multiply by 4184.
How do I convert Kilocalorie back to Joule?
Divide by 0.00023901, or equivalently multiply by 4184. Formula: J = kcal ÷ 0.00023901.
Is the Joule-to-Kilocalorie conversion internationally standardized?
Yes. Both units are defined by international standards (SI or the international yard/pound agreement), so the conversion factor 0.00023901 is exact and universally agreed upon.