The math:
Cubic feet = Area × (Depth ÷ 12) (depth in inches)
Weight (lb) ≈ Cubic feet × 37 (30 dry to 56 wet)
Est. weight
~198 lb
90 kg at 50% moisture · 158 to 296 lb dry to wet
Weight uses about 37 lb per cubic foot (1,000 lb per cubic yard) for screened compost at 50% moisture; drier compost weighs less, wet compost more.