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Watt-hour to Kilojoule Converter

Convert Watt-hour to Kilojoule instantly — live results with exact conversion factors.

3.6 kJ

Answer

1 watt-hour = 3.6 kilojoules. To convert Wh to kJ, multiply by 3.6.

Quick Reference Table

Watt-hour (Wh) Kilojoule (kJ)
1 3.6
2 7.2
5 18
10 36
20 72
50 180
100 360
250 900
500 1800
1000 3600

Formula

Convert Watt-hour (Wh) to Kilojoule (kJ) using the relationship: 

kJ = Wh × 3.6

How to Convert

  1. Take the value in watt-hours (Wh).
  2. Multiply it by 3.6 (the conversion factor from Wh to kJ).
  3. The result is the equivalent value in kilojoules (kJ).
  4. Example: 1 Wh = 3.6 kJ.

Reverse Conversion

Need it the other direction? Kilojoule to Watt-hour conversion.

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FAQ

▸ How many kilojoules are in 1 watt-hour?

1 Watt-hour equals 3.6 kilojoules. Multiply by 3.6 to convert Wh to kJ.

▸ What is the formula to convert watt-hour to kilojoule?

Multiply the value in watt-hours by 3.6 to get kilojoules. Formula: kJ = Wh × 3.6.

▸ How do I convert watt-hours to kilojoules easily?

Enter your value in the converter at the top of this page — the kilojoules result updates live as you type. You can also multiply by 3.6 directly.