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Specific Properties

J/kgtoWh/kg

Convert joules per kilogram (J/kg) to watt-hours per kilogram (Wh/kg).

Factor1 J/kg = 0.0002777778 Wh/kg

Converter

J/kg

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

Result
1Wh/kg

Rendered to 6 significant figures.

Formula

Formula
Wh/kg = J/kg × 0.0002777778

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

Worked example

Convert 3600 J/kg to Wh/kg.

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

Conversion table

J/kgWh/kg
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/kg to Wh/kg?
1 J/kg equals 0.0002777778 Wh/kg. To convert, multiply the value in joules per kilogram by 0.0002777778.
How do I convert 1 J/kg to Wh/kg?
1 J/kg = 0.000277778 Wh/kg. For any value, multiply by 0.0002777778.
How do I convert Wh/kg back to J/kg?
Divide by the same factor — or equivalently, multiply by 3600. So 1 Wh/kg = 3600 J/kg.
When would I need to convert joule per kilogram to watt-hour per kilogram?
Specific-energy conversions between J/kg and Wh/kg are needed in fuel-property datasheets (HHV/LHV), thermodynamic state calculations, battery energy-density comparisons, and combustion analysis. kJ/kg is the SI standard; BTU/lb is common in US fuel specifications.
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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