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Specific Properties

BTU/lbtokJ/kg

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

Factor1 BTU/lb = 2.326 kJ/kg

Converter

BTU/lb

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

Result
232.6kJ/kg

Rendered to 6 significant figures.

Formula

Formula
kJ/kg = BTU/lb × 2.326

Multiply any value in British thermal units per pound by 2.326 to obtain the value in kilojoules per kilogram.

Worked example

Convert 100 BTU/lb to kJ/kg.

  1. 01Start with 100 BTU/lb.
  2. 02Multiply by the conversion factor: 100 × 2.326 = 232.6 kJ/kg.
Result100 BTU/lb = 232.6 kJ/kg

Conversion table

BTU/lbkJ/kg
12.326
24.652
511.63
1023.26
2046.52
50116.3
100232.6
200465.2
5001163
10002326

Reference values rounded to 5 significant figures for display.

FAQ

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