lbf·in·s²
pound-force inch second squared
Moment of inertiaexact by definition
The pound-force inch second squared is exactly 0.1129848290276167 kg·m². It looks strange until you notice that lbf·s²/in is a mass and multiplying by inches gives an inertia; it is the inch-based cousin of the slug square foot.
Watch out: The mass unit behind it, lbf·s²/in, is sometimes called the "blob" or "slinch" and is twelve slugs. It appears in US machine design texts working entirely in inches, and it is a reliable source of factor-of-twelve errors.
| 1 lbf·in·s² | 0.11298483 kg·m² |
Solvers that use moment of inertia