Convert Joules to Watt-Hours
1 J = 0.000277778 Wh
Conversion Table
| joules (J) | watt-hours (Wh) |
|---|---|
| 0.5 | 0.000138889 |
| 1 | 0.000277778 |
| 2 | 0.000555556 |
| 5 | 0.00138889 |
| 10 | 0.00277778 |
| 25 | 0.00694444 |
| 50 | 0.0138889 |
| 100 | 0.0277778 |
| 250 | 0.0694444 |
| 500 | 0.138889 |
| 1000 | 0.277778 |
How to Convert joules to watt-hours
To convert joules to watt-hours, multiply the value by the conversion factor:
For example: 10 J = 0.00277778 Wh
About joules and watt-hours
The Conversion Formula
To convert joules to watt-hours, multiply the value by the conversion factor: 1 J = 0.000277778 Wh. For a worked example, suppose you need to convert 25 J to watt-hours: 25 × 0.000277778 = 0.00694444 Wh. To convert in the opposite direction, divide by 0.000277778, or equivalently multiply by 3600.
About joules
The Joule (J) is the standard unit of energy in the International System of Units (SI). It is named after James Prescott Joule, who proved that heat is a form of energy. One Joule is the work done by a force of one Newton moving an object one meter. It is a small unit: lifting a small apple one meter takes about 1 Joule. joules are commonly used in Scientific research, Physics education, Electronics ratings, and Kinetic energy calculations, Work done.
The energy of a heartbeat is roughly 1 Joule.
About watt-hours
The watt-hour (Wh) is a smaller version of the kilowatt-hour. It is the standard for rating the capacity of batteries in laptops, smartphones, and power banks. Airlines often limit spare batteries to 100Wh for safety. watt-hours are commonly used in Laptop batteries, Power banks, Smartphone specs, and Drone batteries, Portable speakers.
A typical phone battery holds 10-15 Wh.
When Would You Convert joules to watt-hours?
Converting between joules and watt-hours is one of the most common energy conversions. You might need this conversion when working with international specifications, following instructions written for a different measurement system, or comparing values across different standards. Having the conversion factor (1 J = 0.000277778 Wh) memorized or bookmarked can save time in professional and everyday contexts alike.