Angular Momentum is a product of Moment of Inertia and Angular Velocity. Its formula is
Angular Momentum = Moment of Inertia X Angular Velocity
Dimensional Formula of Moment of Inertia= M1L2T0
Dimensional Formula of Angular velocity = M0L0T-1
Putting these values in above equation we get
So Dimensional Formula of Angular Momentum = M1L2T-1
SI unit of Angular Momentum is Kg m2 s-1