Kilojoule to JouleConverter
Instantly convert Kilojoule (kJ) to Joule (J). Free, accurate, and easy to use.
How to Convert Kilojoule to Joule
To convert Kilojoule (kJ) to Joule (J), multiply your value by 1000.
Example: 5 kJ × 1000 = 5000 J
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.
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.
Kilojoule to Joule Conversion Table
| Kilojoule (kJ) | Joule (J) |
|---|---|
| 0.001 kJ | 1 J |
| 0.01 kJ | 10 J |
| 0.1 kJ | 100 J |
| 0.5 kJ | 500 J |
| 1 kJ | 1000 J |
| 2 kJ | 2000 J |
| 5 kJ | 5000 J |
| 10 kJ | 10000 J |
| 20 kJ | 20000 J |
| 50 kJ | 50000 J |
| 100 kJ | 100000 J |
| 200 kJ | 200000 J |
| 500 kJ | 500000 J |
| 1000 kJ | 1000000 J |
| 5000 kJ | 5000000 J |
| 10000 kJ | 10000000 J |
| 50000 kJ | 50000000 J |
| 100000 kJ | 100000000 J |
| 1000000 kJ | 1000000000 J |
| 1000000000 kJ | 1.0000e+12 J |
Frequently Asked Questions
How do I convert Kilojoule to Joule?
Multiply the Kilojoule value by 1000. Formula: J = kJ × 1000. Example: 10 kJ = 10000 J.
How many Joule are in one Kilojoule?
One Kilojoule (kJ) equals 1000 Joule (J).
How many Kilojoule are in one Joule?
One Joule (J) equals 0.001 Kilojoule (kJ).
What is the exact conversion factor from Kilojoule to Joule?
The conversion factor is 1000. Multiply any kJ value by this number to get J. For the reverse, multiply by 0.001.
How do I convert Joule back to Kilojoule?
Divide by 1000, or equivalently multiply by 0.001. Formula: kJ = J ÷ 1000.
Is the Kilojoule-to-Joule conversion internationally standardized?
Yes. Both units are defined by international standards (SI or the international yard/pound agreement), so the conversion factor 1000 is exact and universally agreed upon.