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Specific Properties

MJ/kgtokWh/kg

Convert megajoules per kilogram (MJ/kg) to kilowatt-hours per kilogram (kWh/kg).

Factor1 MJ/kg = 0.2777778 kWh/kg

Converter

MJ/kg

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

Result
1kWh/kg

Rendered to 6 significant figures.

Formula

Formula
kWh/kg = MJ/kg × 0.2777778

Multiply any value in megajoules per kilogram by 0.2777778 to obtain the value in kilowatt-hours per kilogram.

Worked example

Convert 3.6 MJ/kg to kWh/kg.

  1. 01Start with 3.6 MJ/kg.
  2. 02Multiply by the conversion factor: 3.6 × 0.2777778 = 1 kWh/kg.
Result3.6 MJ/kg = 1 kWh/kg

Conversion table

MJ/kgkWh/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 MJ/kg to kWh/kg?
1 MJ/kg equals 0.2777778 kWh/kg. To convert, multiply the value in megajoules per kilogram by 0.2777778.
How do I convert 1 MJ/kg to kWh/kg?
1 MJ/kg = 0.277778 kWh/kg. For any value, multiply by 0.2777778.
How do I convert kWh/kg back to MJ/kg?
Divide by the same factor — or equivalently, multiply by 3.6. So 1 kWh/kg = 3.6 MJ/kg.
When would I need to convert megajoule per kilogram to kilowatt-hour per kilogram?
Specific-energy conversions between MJ/kg and kWh/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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