How the mulch calculator works
Volume in cubic feet = length (ft) × width (ft) × depth (in) ÷ 12. Volume in cubic yards = cubic feet ÷ 27. Bags = ceiling(cubic feet ÷ bag size in cubic feet).
Worked example
A 20 × 8 ft bed at 3 inches deep needs 40 cubic feet, or approximately 1.48 cubic yards. With 2 cu ft bags, buy 20 bags.
Before you order
Irregular bed edges, settling, and uneven existing soil may change the amount required. Keep mulch away from trunks and building siding as recommended locally.
All results are planning estimates, not a guarantee of installed material quantity or a quote. Measure the actual project, verify product labels, and follow the manufacturer’s instructions.
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