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Specific Properties

GJ/kgtoWh/kg

Convert gigajoules per kilogram (GJ/kg) to watt-hours per kilogram (Wh/kg).

Factor1 GJ/kg = 277777.8 Wh/kg

Converter

GJ/kg

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

Result
277778Wh/kg

Rendered to 6 significant figures.

Formula

Formula
Wh/kg = GJ/kg × 277777.8

Multiply any value in gigajoules per kilogram by 277777.8 to obtain the value in watt-hours per kilogram.

Worked example

Convert 1 GJ/kg to Wh/kg.

  1. 01Start with 1 GJ/kg.
  2. 02Multiply by the conversion factor: 1 × 277777.8 = 277778 Wh/kg.
Result1 GJ/kg = 277778 Wh/kg

Conversion table

GJ/kgWh/kg
12.7778e+5
25.5556e+5
51.3889e+6
102.7778e+6
205.5556e+6
501.3889e+7
1002.7778e+7
2005.5556e+7
5001.3889e+8
10002.7778e+8

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from GJ/kg to Wh/kg?
1 GJ/kg equals 277777.8 Wh/kg. To convert, multiply the value in gigajoules per kilogram by 277777.8.
How do I convert 1 GJ/kg to Wh/kg?
1 GJ/kg = 277778 Wh/kg. For any value, multiply by 277777.8.
How do I convert Wh/kg back to GJ/kg?
Divide by the same factor — or equivalently, multiply by 3.6e-6. So 1 Wh/kg = 3.6e-6 GJ/kg.
When would I need to convert gigajoule per kilogram to watt-hour per kilogram?
Specific-energy conversions between GJ/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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