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Specific Properties

MJ/kgtoWh/kg

Convert megajoules per kilogram (MJ/kg) to watt-hours per kilogram (Wh/kg).

Factor1 MJ/kg = 277.7778 Wh/kg

Converter

MJ/kg

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

Result
277.778Wh/kg

Rendered to 6 significant figures.

Formula

Formula
Wh/kg = MJ/kg × 277.7778

Multiply any value in megajoules per kilogram by 277.7778 to obtain the value in watt-hours per kilogram.

Worked example

Convert 1 MJ/kg to Wh/kg.

  1. 01Start with 1 MJ/kg.
  2. 02Multiply by the conversion factor: 1 × 277.7778 = 277.778 Wh/kg.
Result1 MJ/kg = 277.778 Wh/kg

Conversion table

MJ/kgWh/kg
1277.78
2555.56
51388.9
102777.8
205555.6
5013889
10027778
20055556
5001.3889e+5
10002.7778e+5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from MJ/kg to Wh/kg?
1 MJ/kg equals 277.7778 Wh/kg. To convert, multiply the value in megajoules per kilogram by 277.7778.
How do I convert 1 MJ/kg to Wh/kg?
1 MJ/kg = 277.778 Wh/kg. For any value, multiply by 277.7778.
How do I convert Wh/kg back to MJ/kg?
Divide by the same factor — or equivalently, multiply by 0.0036. So 1 Wh/kg = 0.0036 MJ/kg.
When would I need to convert megajoule per kilogram to watt-hour per kilogram?
Specific-energy conversions between MJ/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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