Landscape Materials
The bulk-material engine — the highest-volume traffic magnets: mulch, topsoil, gravel, sand, compost and river rock by area and depth (cubic yards, bags of 2 cu ft, and tons at a labeled density), plus a bulk-material delivered cost from your own supplier quote. The identity is cu yd = area (sq ft) × depth (in) ÷ 324; a cubic yard is ~13.5 bags of 2 cu ft. Buy about 5–10% extra.
Planning estimate: this is a planning estimate. Coverage varies by product (bag size, compaction, waste, slope and how tightly you pack). Buy about 5–10% extra and confirm the coverage printed on the product before you order.
MulchWork out how much mulch you need from your bed area and depth: cubic yards plus the number of bags to buy, with the formula and a full worked example.TopsoilEstimate how much topsoil you need in cubic yards and tons from your area and depth. See the formula, a worked example, and a coverage reference table.Gravel (cu yd & tons)Find how much gravel you need in cubic yards and tons from area, depth and stone density — with the formula, a worked example and a density table.SandCalculate how much sand you need in cubic yards and tons from your area and depth, with the formula, a worked example and a coverage reference table.CompostEstimate how much compost you need in cubic yards and bags from your area and depth, with the formula, a worked example and a coverage table.River Rock & StoneWork out how much river rock or decorative stone you need in cubic yards and tons from area and depth, with the formula and a worked example.Bulk Material CostEstimate the delivered cost of bulk landscape materials from cubic yards, your price per yard, delivery and labor — with a clear worked example.
Every Landscape Materials tool is calculated server-side — visible immediately — with its formula, a worked example and a reference table, and works on the quantities you measure and the prices you enter. Background reading is in the guides.