Kilojoule to Watt-hour Converter
Convert kilojoules to watt-hours (kJ to Wh) instantly with this free online energy converter. Enter any value in the Kilojoule field and get the equivalent in Watt-hour immediately. This converter handles any quantity — from tiny fractions to large numbers — with full precision. No signup, no ads in the widget, and the conversion runs entirely in your browser for instant results.
The conversion factor is exact: 1 kJ = 0.2777777778 Wh. To convert kilojoules to watt-hours, multiply your Kilojoule value by 0.2777777778. For example, 10 kJ = 2.777777778 Wh. You can also reverse the calculation: 1 Wh = 3.6 kJ.
Quick conversion table
| Kilojoule (kJ) | Watt-hour (Wh) |
|---|---|
| 1 kJ | 0.2777777778 Wh |
| 5 kJ | 1.388888889 Wh |
| 10 kJ | 2.777777778 Wh |
| 25 kJ | 6.944444444 Wh |
| 50 kJ | 13.88888889 Wh |
| 100 kJ | 27.77777778 Wh |
Use the swap button to reverse the direction, or choose a different unit from the dropdown menus to convert within the energy category.
Formula
Kilojoule to Watt-hour conversion: 1 kJ = 0.2777777778 Wh watt-hours = kilojoules × 0.2777777778 1 Wh = 3.6 kJ kilojoules = watt-hours × 3.6
Example
Example: Convert 10 kJ to Wh: 10 kJ × 0.2777777778 = 2.777777778 Wh So, 10 kJ is about 2.777777778 Wh. To convert back, multiply by 3.6: 2.777777778 Wh × 3.6 = 10 kJ.
How to Use
- Enter the value you want to convert in the Kilojoule field
- The result in Watt-hour appears instantly below
- Use the dropdown menus to change units if needed
- Click 'Swap Units' to reverse the conversion direction
- Copy the result or adjust the input for a new conversion
Frequently Asked Questions
How do I convert kilojoules to watt-hours?
Enter the value in Kilojoule (kJ) in the 'From' field. The equivalent in Watt-hour (Wh) appears instantly in the 'To' field. The converter uses precise conversion factors and updates in real time as you type.
What is the formula to convert kJ to Wh?
1 kJ = 0.2777777778 Wh, so watt-hours = kilojoules × 0.2777777778. To convert back, 1 Wh = 3.6 kJ. The full formula and a worked example are shown on this page.
How many watt-hours are in one Kilojoule?
1 kJ = 0.2777777778 Wh.
Is this Kilojoule to Watt-hour converter free?
Yes, completely free with no signup, no limits, and no ads in the converter widget. You can convert as many values as you need. The tool runs entirely in your browser, so your data never leaves your device.
Can I convert watt-hours back to kilojoules?
Yes. Click the 'Swap Units' button to reverse the direction. You can also use the dropdown menus to select any other energy unit for either field.
How accurate is the kJ to Wh conversion?
The converter uses high-precision conversion factors (up to 8 decimal places). Results are displayed with up to 6 decimal places, with trailing zeros removed for readability. For scientific or engineering work, always verify with official standards.