How Does This Calculator Work?
The calculator multiplies your bed area by the mulch depth (converted from inches to feet) to get cubic feet, then divides by 27 to convert to cubic yards.
Buying the right amount of mulch saves you a second trip to the garden center. This calculator converts your bed's area and desired mulch depth into cubic yards, the standard unit mulch is sold in bulk.
Example Calculation
Garden Bed Example
A 150 sq ft flower bed, mulched 3 inches deep.
(150 × (3/12)) ÷ 27 ≈ 1.39 cubic yards.
Tips
A 2–3 inch depth is standard for most garden beds — enough to suppress weeds and retain moisture without smothering plant roots.