Convert Kilojoules to Watt-Hours
1 kJ = 0.277778 Wh
Conversion Table
| kilojoules (kJ) | watt-hours (Wh) |
|---|---|
| 0.5 | 0.138889 |
| 1 | 0.277778 |
| 2 | 0.555556 |
| 5 | 1.3889 |
| 10 | 2.7778 |
| 25 | 6.9444 |
| 50 | 13.8889 |
| 100 | 27.7778 |
| 250 | 69.4444 |
| 500 | 138.89 |
| 1000 | 277.78 |
How to Convert kilojoules to watt-hours
To convert kilojoules to watt-hours, multiply the value by the conversion factor:
For example: 10 kJ = 2.7778 Wh
About kilojoules and watt-hours
The Conversion Formula
To convert kilojoules to watt-hours, multiply the value by the conversion factor: 1 kJ = 0.277778 Wh. For a worked example, suppose you need to convert 25 kJ to watt-hours: 25 × 0.277778 = 6.9444 Wh. To convert in the opposite direction, divide by 0.277778, or equivalently multiply by 3.6.
About kilojoules
The kilojoule (kJ) is the standard unit for food energy in most of the world (Australia, Europe, etc.), replacing the Calorie. One food Calorie (kcal) is approximately 4.2 kJ. It provides a more precise measure of energy intake than the large Calorie. kilojoules are commonly used in Food labels (Global), Exercise machines, Diet planning, and Thermodynamics, Metabolic rate tracking.
A slice of bread has about 300-400 kJ.
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 kilojoules to watt-hours?
Converting between kilojoules 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 kJ = 0.277778 Wh) memorized or bookmarked can save time in professional and everyday contexts alike.