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Specific Properties

kJ/kgtoBTU/lb

Convert kilojoules per kilogram (kJ/kg) to British thermal units per pound (BTU/lb).

Factor1 kJ/kg = 0.4299226 BTU/lb

Converter

kJ/kg

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

Result
42.9923BTU/lb

Rendered to 6 significant figures.

Formula

Formula
BTU/lb = kJ/kg × 0.4299226

Multiply any value in kilojoules per kilogram by 0.4299226 to obtain the value in British thermal units per pound.

Worked example

Convert 100 kJ/kg to BTU/lb.

  1. 01Start with 100 kJ/kg.
  2. 02Multiply by the conversion factor: 100 × 0.4299226 = 42.9923 BTU/lb.
Result100 kJ/kg = 42.9923 BTU/lb

Conversion table

kJ/kgBTU/lb
10.42992
20.85985
52.1496
104.2992
208.5985
5021.496
10042.992
20085.985
500214.96
1000429.92

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from kJ/kg to BTU/lb?
1 kJ/kg equals 0.4299226 BTU/lb. To convert, multiply the value in kilojoules per kilogram by 0.4299226.
How do I convert 1 kJ/kg to BTU/lb?
1 kJ/kg = 0.429923 BTU/lb. For any value, multiply by 0.4299226.
How do I convert BTU/lb back to kJ/kg?
Divide by the same factor — or equivalently, multiply by 2.326. So 1 BTU/lb = 2.326 kJ/kg.
When would I need to convert kilojoule per kilogram to British thermal unit per pound?
Specific-energy conversions between kJ/kg and BTU/lb 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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