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Power and Energy

JtoWh

Convert joules (J) to watt-hours (Wh).

Factor1 J = 0.0002777778 Wh

Converter

J

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

Result
1Wh

Rendered to 6 significant figures.

Formula

Formula
Wh = J × 0.0002777778

Multiply any value in joules by 0.0002777778 to obtain the value in watt-hours.

Worked example

Convert 3600 J to Wh.

  1. 01Start with 3600 J.
  2. 02Multiply by the conversion factor: 3600 × 0.0002777778 = 1 Wh.
Result3600 J = 1 Wh

Conversion table

JWh
10.00027778
20.00055556
50.0013889
100.0027778
200.0055556
500.013889
1000.027778
2000.055556
5000.13889
10000.27778

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from J to Wh?
1 J equals 0.0002777778 Wh. To convert, multiply the value in joules by 0.0002777778.
How do I convert 1 J to Wh?
1 J = 0.000277778 Wh. For any value, multiply by 0.0002777778.
How do I convert Wh back to J?
Divide by the same factor — or equivalently, multiply by 3600. So 1 Wh = 3600 J.
When would I need to convert joule 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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