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Specific Properties

kJ/kgtoWh/kg

Convert kilojoules per kilogram (kJ/kg) to watt-hours per kilogram (Wh/kg).

Factor1 kJ/kg = 0.2777778 Wh/kg

Converter

kJ/kg

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

Result
0.277778Wh/kg

Rendered to 6 significant figures.

Formula

Formula
Wh/kg = kJ/kg × 0.2777778

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

Worked example

Convert 1 kJ/kg to Wh/kg.

  1. 01Start with 1 kJ/kg.
  2. 02Multiply by the conversion factor: 1 × 0.2777778 = 0.277778 Wh/kg.
Result1 kJ/kg = 0.277778 Wh/kg

Conversion table

kJ/kgWh/kg
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/kg to Wh/kg?
1 kJ/kg equals 0.2777778 Wh/kg. To convert, multiply the value in kilojoules per kilogram by 0.2777778.
How do I convert 1 kJ/kg to Wh/kg?
1 kJ/kg = 0.277778 Wh/kg. For any value, multiply by 0.2777778.
How do I convert Wh/kg back to kJ/kg?
Divide by the same factor — or equivalently, multiply by 3.6. So 1 Wh/kg = 3.6 kJ/kg.
When would I need to convert kilojoule per kilogram to watt-hour per kilogram?
Specific-energy conversions between kJ/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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