Joule to Kilowatt-hourConverter
Instantly convert Joule (J) to Kilowatt-hour (kWh). Free, accurate, and easy to use.
How to Convert Joule to Kilowatt-hour
To convert Joule (J) to Kilowatt-hour (kWh), multiply your value by 2.7778e-7.
Example: 5 J × 2.7778e-7 = 0.00000139 kWh
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 Kilowatt-hour?
The kilowatt-hour (kWh) is the energy consumed by a device drawing 1,000 watts for one continuous hour, equal to exactly 3,600,000 Joules (3.6 MJ). It is the universal billing unit for household and commercial electricity consumption. The average US household uses about 10,500 kWh per year. A 100-watt incandescent light bulb running for 10 hours consumes exactly 1 kWh.
Joule to Kilowatt-hour Conversion Table
| Joule (J) | Kilowatt-hour (kWh) |
|---|---|
| 0.001 J | 2.7778e-10 kWh |
| 0.01 J | 2.7778e-9 kWh |
| 0.1 J | 2.7778e-8 kWh |
| 0.5 J | 1.3889e-7 kWh |
| 1 J | 2.7778e-7 kWh |
| 2 J | 5.5556e-7 kWh |
| 5 J | 0.00000139 kWh |
| 10 J | 0.00000278 kWh |
| 20 J | 0.00000556 kWh |
| 50 J | 0.00001389 kWh |
| 100 J | 0.00002778 kWh |
| 200 J | 0.00005556 kWh |
| 500 J | 0.00013889 kWh |
| 1000 J | 0.00027778 kWh |
| 5000 J | 0.00138889 kWh |
| 10000 J | 0.00277778 kWh |
| 50000 J | 0.01388889 kWh |
| 100000 J | 0.02777778 kWh |
| 1000000 J | 0.27777778 kWh |
| 1000000000 J | 277.77777778 kWh |
Frequently Asked Questions
How do I convert Joule to Kilowatt-hour?
Multiply the Joule value by 2.7778e-7. Formula: kWh = J × 2.7778e-7. Example: 10 J = 0.00000278 kWh.
How many Kilowatt-hour are in one Joule?
One Joule (J) equals 2.7778e-7 Kilowatt-hour (kWh).
How many Joule are in one Kilowatt-hour?
One Kilowatt-hour (kWh) equals 3600000 Joule (J).
What is the exact conversion factor from Joule to Kilowatt-hour?
The conversion factor is 2.7778e-7. Multiply any J value by this number to get kWh. For the reverse, multiply by 3600000.
How do I convert Kilowatt-hour back to Joule?
Divide by 2.7778e-7, or equivalently multiply by 3600000. Formula: J = kWh ÷ 2.7778e-7.
Is the Joule-to-Kilowatt-hour conversion internationally standardized?
Yes. Both units are defined by international standards (SI or the international yard/pound agreement), so the conversion factor 2.7778e-7 is exact and universally agreed upon.