Grounds ToolkitMaterials and Applications
How Much Material Is Needed for This Area and Depth?
Enter the area and the depth this job needs. This calculates cubic yards of mulch, soil, or gravel required, the unit bulk material is actually sold and delivered in.
How this is calculated
Area times depth (converted from inches to feet) gives cubic feet, divided by 27 to convert to cubic yards. This is pure geometry, no invented density or coverage-rate assumption, since actual yield varies by material and supplier.
Worked example
A 1,000 sq ft bed at a 3-inch mulch depth needs 250 cubic feet (1,000 × 0.25), which is 9.26 cubic yards (250 ÷ 27).
Frequently asked questions
Why cubic yards instead of bags?
Bulk mulch, soil, and gravel are sold and delivered by the cubic yard. If you are buying bagged material instead, check the bag's labeled volume (often 2 cubic feet) and divide the cubic yard result accordingly.
What depth should I use?
This calculator does not recommend a depth, it varies by material and purpose (2 to 4 inches is common for mulch, deeper for drainage gravel). Enter whatever depth your job calls for.
Does this account for material settling or compaction?
No, this is the raw geometric volume at the depth entered. Loose material typically settles somewhat over time, some suppliers build a small overage into their delivery estimates for this reason.
Is the formula different for mulch versus soil versus gravel?
No, the volume math is identical, area times depth. What differs between materials is density and cost, which affect weight and price, not the cubic-yard volume calculated here.