Convert Inch-Pound-Force to Foot-Pound-Force
Convert Inch-Pound-Force (in·lbf) to Foot-Pound-Force (ft·lbf) instantly and accurately.
Conversion Formula
ft·lbf = in·lbf × 0.08333333333
About Inch-Pound-Force
An inch-pound-force (in·lbf) is the work done by one pound-force through one inch - exactly 0.11298482902761670 J (= 1/12 ft·lbf). It is the dominant torque unit for small fasteners and precision instruments in the US: a #6-32 screw in aluminium is torqued to 4-6 in·lbf; a dental implant abutment screw to ~25-30 Ncm (2.2-2.7 in·lbf). Hobby servo motor torque is quoted in oz·in (1 in·lbf = 16 oz·in). Bicycle stem bolts are typically 4-6 Nm (35-53 in·lbf). 1 in·lbf = 0.11298 J = 1/12 ft·lbf = 11.298 Ncm.
About Foot-Pound-Force
A foot-pound-force (ft·lbf) is the work done by one pound-force through one foot - exactly 1.3558179483314004 J. It is the standard torque and energy unit in US engineering. Automotive engine torque: Honda Civic ~125 lb-ft; Ford F-150 EcoBoost ~500 lb-ft. Muzzle energies: .22 LR ~140 ft·lbf; .308 Winchester ~2,600 ft·lbf; .50 BMG ~14,000 ft·lbf. Diesel pile hammers deliver 15,000-600,000 ft·lbf/blow. SAE Grade 8 bolts are specified at 7-950 ft·lbf. 1 ft·lbf = 12 in·lbf = 1.35582 J = 0.32405 cal.
Quick Reference Table
| Inch-Pound-Force (in·lbf) | Foot-Pound-Force (ft·lbf) |
|---|---|
| 1 in·lbf | 0.0833333 ft·lbf |
| 2 in·lbf | 0.166667 ft·lbf |
| 5 in·lbf | 0.416667 ft·lbf |
| 10 in·lbf | 0.833333 ft·lbf |
| 25 in·lbf | 2.08333 ft·lbf |
| 50 in·lbf | 4.16667 ft·lbf |
| 100 in·lbf | 8.33333 ft·lbf |