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Specific Properties

J/kgtoBTU/lb

Convert joules per kilogram (J/kg) to British thermal units per pound (BTU/lb).

Factor1 J/kg = 0.0004299226 BTU/lb

Converter

J/kg

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

Result
4.29923BTU/lb

Rendered to 6 significant figures.

Formula

Formula
BTU/lb = J/kg × 0.0004299226

Multiply any value in joules per kilogram by 0.0004299226 to obtain the value in British thermal units per pound.

Worked example

Convert 10000 J/kg to BTU/lb.

  1. 01Start with 10000 J/kg.
  2. 02Multiply by the conversion factor: 10000 × 0.0004299226 = 4.29923 BTU/lb.
Result10000 J/kg = 4.29923 BTU/lb

Conversion table

J/kgBTU/lb
10.00042992
20.00085985
50.0021496
100.0042992
200.0085985
500.021496
1000.042992
2000.085985
5000.21496
10000.42992

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from J/kg to BTU/lb?
1 J/kg equals 0.0004299226 BTU/lb. To convert, multiply the value in joules per kilogram by 0.0004299226.
How do I convert 1 J/kg to BTU/lb?
1 J/kg = 0.000429923 BTU/lb. For any value, multiply by 0.0004299226.
How do I convert BTU/lb back to J/kg?
Divide by the same factor — or equivalently, multiply by 2326. So 1 BTU/lb = 2326 J/kg.
When would I need to convert joule per kilogram to British thermal unit per pound?
Specific-energy conversions between J/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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