Watt-Hour to Kilojoule Converter
Convert Watt-Hour (Wh) to Kilojoule (kJ) instantly. 1 Wh = 3.6 kJ.
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1 Wh = 3.6 kJ
Formula:
kJ = Wh × 3.6With your value: 1 Wh = 3.6 kJ
How big is that?
Everyday references on a logarithmic scale, all expressed in watt-hour so you can sanity-check the result.
Other Watt-Hour to Kilojoule conversions
Watt-Hour to Kilojoule Conversion Table
| Watt-Hour (Wh) | Kilojoule (kJ) |
|---|---|
| 0.5 | 1.8 |
| 1 | 3.6 |
| 2 | 7.2 |
| 5 | 18 |
| 10 | 36 |
| 15 | 54 |
| 20 | 72 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 250 | 900 |
| 500 | 1,800 |
| 1000 | 3,600 |
Kilojoule to Watt-Hour Conversion Table
| Kilojoule (kJ) | Watt-Hour (Wh) |
|---|---|
| 0.5 | 0.138889 |
| 1 | 0.277778 |
| 2 | 0.555556 |
| 5 | 1.388889 |
| 10 | 2.777778 |
| 15 | 4.166667 |
| 20 | 5.555556 |
| 25 | 6.944444 |
| 50 | 13.888889 |
| 100 | 27.777778 |
| 250 | 69.444444 |
| 500 | 138.888889 |
| 1000 | 277.777778 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Watt-Hour (Wh)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Kilojoule (kJ)
Energy
Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Watt-Hour to Kilojoule
To convert from Watt-Hour (Wh) to Kilojoule (kJ), multiply the value by 3.6.
Formula: kJ = Wh × 3.6
Reverse: Wh = kJ × 0.2777777778
Step-by-Step Example
- Start with your value in Watt-Hour. For example: 5 Wh
- Multiply by the conversion factor: 5 x 3.6
- The result is: 18 kJ
About Watt-Hour
The watt-hour (Wh) is a unit of energy and work. One watt-hour equals 3600 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: energy calculations, engineering and science, education.
About Kilojoule
The kilojoule (kJ) is a unit of energy and work. One kilojoule equals 1000 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: energy calculations, engineering and science, education.
Frequently Asked Questions
How many Kilojoule are in 1 Watt-Hour?
There are exactly 3.6 Kilojoule in 1 Watt-Hour. This means the conversion factor from Watt-Hour to Kilojoule is 3.6.
What is the formula to convert Watt-Hour to Kilojoule?
The formula to convert Watt-Hour to Kilojoule is: kJ = Wh × 3.6. For example, to convert 10 Watt-Hour to Kilojoule, you would multiply 10 by 3.6.
What is a Watt-Hour?
The watt-hour (Wh) is a unit of energy and work. One watt-hour equals 3600 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What is a Kilojoule?
The kilojoule (kJ) is a unit of energy and work. One kilojoule equals 1000 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Watt-Hour?
The Watt-Hour is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Watt-Hour to Kilojoule converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/watt_hour-to-kilojoule