How to Calculate Cubic Yards
A cubic yard is the standard unit for bulk material. Here's the formula and a worked example.
The formula
Cubic yards = (length × width × depth) ÷ 27, when every dimension is in feet.
There are 27 cubic feet in one cubic yard (3 × 3 × 3).
Example
A 1,000 sq ft bed at 3 inches of mulch: depth in feet = 3 / 12 = 0.25.
Cubic feet = 1,000 × 0.25 = 250. Cubic yards = 250 / 27 ≈ 9.26.
Add 10% waste and round up to about 10.2 cubic yards.
Common mistakes
Forgetting to convert depth from inches to feet.
Ordering without a waste factor for irregular beds.
Confusing cubic yards with tons — tons depend on material density.
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These results are estimates only. Confirm quantities, compaction, waste, and delivery requirements with your supplier or project professional before ordering materials.