Power and Energy
ft·lbftokJ
Convert foot-pounds force (ft·lbf) to kilojoules (kJ).
Factor1 ft·lbf = 0.001355818 kJ
Converter
ft·lbf
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kJ
Rendered to 6 significant figures.
Formula
Formula
kJ = ft·lbf × 0.001355818
Multiply any value in foot-pounds force by 0.001355818 to obtain the value in kilojoules.
Worked example
Convert 1000 ft·lbf to kJ.
- 01Start with 1000 ft·lbf.
- 02Multiply by the conversion factor: 1000 × 0.001355818 = 1.35582 kJ.
Result1000 ft·lbf = 1.35582 kJ
Conversion table
| ft·lbf | kJ |
|---|---|
| 1 | 0.0013558 |
| 2 | 0.0027116 |
| 5 | 0.0067791 |
| 10 | 0.013558 |
| 20 | 0.027116 |
| 50 | 0.067791 |
| 100 | 0.13558 |
| 200 | 0.27116 |
| 500 | 0.67791 |
| 1000 | 1.3558 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from ft·lbf to kJ?
1 ft·lbf equals 0.001355818 kJ. To convert, multiply the value in foot-pounds force by 0.001355818.
How do I convert 1 ft·lbf to kJ?
1 ft·lbf = 0.00135582 kJ. For any value, multiply by 0.001355818.
How do I convert kJ back to ft·lbf?
Divide by the same factor — or equivalently, multiply by 737.5621. So 1 kJ = 737.562 ft·lbf.
When would I need to convert foot-pound force to kilojoule?
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).