Total multiple beds or paths, separate compaction from purchasing allowance, and calculate whole bags or bulk volume.
A label only. It does not choose density or depth.
Each zone can use different ground/depth units. Unit changes reinterpret the entered numbers.
Extra material applied after the loose-volume calculation.
Optional. 10% means 10% of the loose volume is lost, so divide installed volume by 0.9.
If compacted density is entered, loose density = compacted density × remaining loose-volume fraction under this mass-conserving model. Actual moisture and site conditions can change density.
Material to order
A 10 × 20 ft bed covered 3 inches deep needs 50 ft³ before adjustments. That is about 1.852 yd³, or 25 bags at 2 ft³ per bag.
A 10% purchasing allowance adds 5 ft³. True 10% compaction loss instead means 90% of loose volume remains after placement, so 50 ÷ 0.9 requires about 55.556 ft³ before allowance. Keep these adjustments separate to avoid counting the same extra twice.
