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Power and Energy

kJtoWh

Convert kilojoules (kJ) to watt-hours (Wh).

Factor1 kJ = 0.2777778 Wh

Converter

kJ

Accepts numbers or expressions, e.g. 150 + 14.7

Result
2.77778Wh

Rendered to 6 significant figures.

Formula

Formula
Wh = kJ × 0.2777778

Multiply any value in kilojoules by 0.2777778 to obtain the value in watt-hours.

Worked example

Convert 10 kJ to Wh.

  1. 01Start with 10 kJ.
  2. 02Multiply by the conversion factor: 10 × 0.2777778 = 2.77778 Wh.
Result10 kJ = 2.77778 Wh

Conversion table

kJWh
10.27778
20.55556
51.3889
102.7778
205.5556
5013.889
10027.778
20055.556
500138.89
1000277.78

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from kJ to Wh?
1 kJ equals 0.2777778 Wh. To convert, multiply the value in kilojoules by 0.2777778.
How do I convert 1 kJ to Wh?
1 kJ = 0.277778 Wh. For any value, multiply by 0.2777778.
How do I convert Wh back to kJ?
Divide by the same factor — or equivalently, multiply by 3.6. So 1 Wh = 3.6 kJ.
When would I need to convert kilojoule to watt-hour?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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