Power and Energy
ft·lbftoBTU
Convert foot-pounds force (ft·lbf) to International Table BTUs (BTU).
Factor1 ft·lbf = 0.001285067 BTU
Converter
ft·lbf
Accepts numbers or expressions, e.g. 150 + 14.7
Result
BTU
Rendered to 6 significant figures.
Formula
Formula
BTU = ft·lbf × 0.001285067
Multiply any value in foot-pounds force by 0.001285067 to obtain the value in International Table BTUs.
Worked example
Convert 778 ft·lbf to BTU.
- 01Start with 778 ft·lbf.
- 02Multiply by the conversion factor: 778 × 0.001285067 = 0.999782 BTU.
Result778 ft·lbf = 0.999782 BTU
Conversion table
| ft·lbf | BTU |
|---|---|
| 1 | 0.0012851 |
| 2 | 0.0025701 |
| 5 | 0.0064253 |
| 10 | 0.012851 |
| 20 | 0.025701 |
| 50 | 0.064253 |
| 100 | 0.12851 |
| 200 | 0.25701 |
| 500 | 0.64253 |
| 1000 | 1.2851 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from ft·lbf to BTU?
1 ft·lbf equals 0.001285067 BTU. To convert, multiply the value in foot-pounds force by 0.001285067.
How do I convert 1 ft·lbf to BTU?
1 ft·lbf = 0.00128507 BTU. For any value, multiply by 0.001285067.
How do I convert BTU back to ft·lbf?
Divide by the same factor — or equivalently, multiply by 778.1693. So 1 BTU = 778.169 ft·lbf.
When would I need to convert foot-pound force to International Table BTU?
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).