▸ processconvert
Power and Energy

BTUtoft·lbf

Convert International Table BTUs (BTU) to foot-pounds force (ft·lbf).

Factor1 BTU = 778.1693 ft·lbf

Converter

BTU

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

Result
778.169ft·lbf

Rendered to 6 significant figures.

Formula

Formula
ft·lbf = BTU × 778.1693

Multiply any value in International Table BTUs by 778.1693 to obtain the value in foot-pounds force.

Worked example

Convert 1 BTU to ft·lbf.

  1. 01Start with 1 BTU.
  2. 02Multiply by the conversion factor: 1 × 778.1693 = 778.169 ft·lbf.
Result1 BTU = 778.169 ft·lbf

Conversion table

BTUft·lbf
1778.17
21556.3
53890.8
107781.7
2015563
5038908
10077817
2001.5563e+5
5003.8908e+5
10007.7817e+5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from BTU to ft·lbf?
1 BTU equals 778.1693 ft·lbf. To convert, multiply the value in International Table BTUs by 778.1693.
How do I convert 1 BTU to ft·lbf?
1 BTU = 778.169 ft·lbf. For any value, multiply by 778.1693.
How do I convert ft·lbf back to BTU?
Divide by the same factor — or equivalently, multiply by 0.001285067. So 1 ft·lbf = 0.00128507 BTU.
When would I need to convert International Table BTU to foot-pound force?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
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).

Related conversions