Mulch Calculator: Cubic Yards & Bags

The mulch formula

Cubic yards = square feet × depth (in) ÷ 324. One cubic yard covers 324 sq ft at 1 inch, 162 sq ft at 2 inches or 108 sq ft at 3 inches. For bags, divide the cubic feet by the bag size: a 200 sq ft bed at 3 inches needs 50 cu ft, or 25 bags of 2 cu ft.

How deep should mulch be?

2–3 inches is right for most flower beds. Thinner layers do not stop weeds well, and more than 4 inches can keep roots too wet. Keep mulch a few inches away from tree trunks and plant stems.

Bulk or bags?

Bags are convenient for small beds. Above about 2–3 cubic yards bulk delivery is usually cheaper, even with a delivery fee. Prices vary a lot by region and material, so enter your local price to compare.

How much area does a yard of mulch cover?

About 324 sq ft at 1 inch deep, 162 sq ft at 2 inches and 108 sq ft at 3 inches.

How many bags of mulch are in a yard?

A cubic yard is 27 cu ft: about 13.5 bags of 2 cu ft or 9 bags of 3 cu ft.

How much mulch do I need for a 10x10 bed?

A 10 × 10 ft bed (100 sq ft) at 3 inches needs 25 cu ft, about 0.93 cubic yards or 13 bags of 2 cu ft.

How deep should mulch be?

Usually 2–3 inches for garden beds and 3–4 inches for paths and around trees.