By Spear Count
A pound of asparagus as purchased provides 3.38 portions of 4 medium cooked spears.  For 25 portions, 7.5 lbs are required, for 100 portions 29.75 lbs.

By Weight
A pound as purchased 2.61 portions of 3 oz. of cut cooked spears, for 25 portions 9.75 and for 100 portions 38.5 lbs.

A rule of thumb to follow is that a case of asparagus will yield 49% of the purchased weight in cooked cut asparagus spears.

A 28 lb. net at 49% will yield 73.17 potions of 3 oz. of cooked cut spears and 1.5 crates are required for 100 portions