lbf·ft·s²

pound-force foot second squared

Moment of inertiaexact by definition

The pound-force foot second squared is exactly 1.3558179483314004 kg·m², numerically identical to the slug square foot. It is the same quantity written from the torque side: apply one lbf·ft for one second to this inertia and you get one radian per second.

1 lbf·ft·s² 1.3558179 kg·m²