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Specific Properties

Wh/kgtokJ/kg

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

Factor1 Wh/kg = 3.6 kJ/kg

Converter

Wh/kg

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

Result
360kJ/kg

Rendered to 6 significant figures.

Formula

Formula
kJ/kg = Wh/kg × 3.6

Multiply any value in watt-hours per kilogram by 3.6 to obtain the value in kilojoules per kilogram.

Worked example

Convert 100 Wh/kg to kJ/kg.

  1. 01Start with 100 Wh/kg.
  2. 02Multiply by the conversion factor: 100 × 3.6 = 360 kJ/kg.
Result100 Wh/kg = 360 kJ/kg

Conversion table

Wh/kgkJ/kg
13.6
27.2
518
1036
2072
50180
100360
200720
5001800
10003600

Reference values rounded to 5 significant figures for display.

FAQ

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