Convert Pound-force inches to Poundal feet
Convert Pound-force inches (lbf·in) to Poundal feet (pdl·ft) instantly and accurately.
Conversion Formula
pdl·ft = lbf·in × 2.681170713
About Pound-force inches
The pound-force inch (lbf·in) equals ≈ 0.11299 N·m, the dominant US customary unit for motor and machinery documentation. Rockwell Automation, Parker Hannifin, and Allied Motion servo catalogs express stall and rated torques in lbf·in; US machine-tool spindles and conveyor drive gearboxes are also specified in lbf·in. Typical fractional-horsepower motor torques: 5-200 lbf·in. 1 lbf·in ≈ 0.11299 N·m = 16 ozf·in = 1/12 lbf·ft.
About Poundal feet
The poundal foot (pdl·ft) equals ≈ 0.04214 N·m, the torque unit of the absolute foot-pound-second system, where force is in poundals (1 pdl = 1 lb·ft/s²) rather than pound-force. It appeared in pre-SI British and American engineering texts and NACA aerodynamic stability reports alongside slug inertia values. 1 pdl·ft = 0.45359237 × 0.3048² N·m ≈ 0.04214 N·m ≈ 0.3730 lbf·in.
Quick Reference Table
| Pound-force inches (lbf·in) | Poundal feet (pdl·ft) |
|---|---|
| 1 lbf·in | 2.68117 pdl·ft |
| 2 lbf·in | 5.36234 pdl·ft |
| 5 lbf·in | 13.4059 pdl·ft |
| 10 lbf·in | 26.8117 pdl·ft |
| 25 lbf·in | 67.0293 pdl·ft |
| 50 lbf·in | 134.059 pdl·ft |
| 100 lbf·in | 268.117 pdl·ft |