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Specific Properties

BTU/lbtocal/kg

Convert British thermal units per pound (BTU/lb) to calories per kilogram (cal/kg).

Factor1 BTU/lb = 555.9274 cal/kg

Converter

BTU/lb

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

Result
555.927cal/kg

Rendered to 6 significant figures.

Formula

Formula
cal/kg = BTU/lb × 555.9274

Multiply any value in British thermal units per pound by 555.9274 to obtain the value in calories per kilogram.

Worked example

Convert 1 BTU/lb to cal/kg.

  1. 01Start with 1 BTU/lb.
  2. 02Multiply by the conversion factor: 1 × 555.9274 = 555.927 cal/kg.
Result1 BTU/lb = 555.927 cal/kg

Conversion table

BTU/lbcal/kg
1555.93
21111.9
52779.6
105559.3
2011119
5027796
10055593
2001.1119e+5
5002.7796e+5
10005.5593e+5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU/lb to cal/kg?
1 BTU/lb equals 555.9274 cal/kg. To convert, multiply the value in British thermal units per pound by 555.9274.
How do I convert 1 BTU/lb to cal/kg?
1 BTU/lb = 555.927 cal/kg. For any value, multiply by 555.9274.
How do I convert cal/kg back to BTU/lb?
Divide by the same factor — or equivalently, multiply by 0.001798796. So 1 cal/kg = 0.0017988 BTU/lb.
When would I need to convert British thermal unit per pound to calorie per kilogram?
Specific-energy conversions between BTU/lb and cal/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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