Mulch coverage and bags per cubic yard

By Yard Count · Published October 2, 2026 · Editorial approach

One cubic yard covers 162 square feet at 2 inches deep, 108 at 3 inches, or 81 at 4 inches. A cubic yard is 27 cubic feet, equal to 13.5 two-cubic-foot bags; buy 14 whole bags if you need at least a yard.

Coverage depends on the depth you add

The same volume covers less ground as the layer gets deeper. These are geometry-based estimates for an even layer, not a manufacturer's guaranteed coverage. Choose the new depth using the top-up guide before using this table.

Square feet covered, with no extra allowance
Volume	1 inch	2 inches	3 inches	4 inches
1 cu ft bag	12	6	4	3
1.5 cu ft bag	18	9	6	4.5
2 cu ft bag	24	12	8	6
3 cu ft bag	36	18	12	9
1 cubic yard	324	162	108	81

Coverage in sq ft = cubic feet × 12 ÷ depth in inches

For one yard at 3 inches: 27 × 12 ÷ 3 = 108 square feet. For a two-cubic-foot bag at the same depth: 2 × 12 ÷ 3 = 8 square feet.

Bag equivalents are different from bags to buy

Use the exact equivalent for price comparisons. Use whole bags for a shopping list. Rounding each yard separately can overstate a larger order.

Bags needed for at least the stated volume; no extra allowance
Bag size	Exact bags / yd³	Buy for 1 yd³	Buy for 2 yd³	Buy for 3 yd³
1 cu ft	27	27	54	81
1.5 cu ft	18	18	36	54
2 cu ft	13.5	14	27	41
3 cu ft	9	9	18	27

For two cubic yards in two-cubic-foot bags, divide 54 by 2 and buy 27 bags. Do not multiply the rounded one-yard count of 14 by two: that would buy 28 bags, an extra 2 cubic feet.

Worked order: a 12 × 18 ft bed

Area: 12 × 18 = 216 square feet.
New layer: 3 inches, or one-quarter of a foot.
Volume: 216 × 3 ÷ 12 = 54 cubic feet, exactly 2 cubic yards.
Two-cubic-foot bags: 54 ÷ 2 = 27 bags.

If you deliberately add a 10% allowance, the volume becomes 59.4 cubic feet (2.2 cubic yards), or 30 whole bags. A supplier selling in quarter-yard increments would round the bulk order to 2.25 yards. These are different purchase quantities for the same planned layer.

Why actual coverage can differ

Sloped ground, uneven spreading, bed edges, and uncertain measurements affect the estimate. Settling also changes the finished layer. There is no single allowance that fits every mulch product and bed. Use the product label when it specifies expanded coverage, and measure your bed rather than choosing a percentage to compensate for an unknown area.

A bag marked in pounds cannot be converted reliably with these tables: moisture and material change its weight. Find its volume or ask the supplier. For irregular beds, use the measurement worksheet.

Use volume to compare bag prices

Illustrative example: a $3 bag containing 1.5 cubic feet costs $2 per cubic foot. A $4 bag containing 2 cubic feet also costs $2 per cubic foot. Neither has a lower unit price, but whole-bag rounding can still change the final bill. Use the full-order comparison for delivery and minimum orders.

Method: original calculations from 12 inches per foot and 27 cubic feet per cubic yard. Figures checked October 2, 2026. Tables are arithmetic references, not recommendations to apply every listed depth.

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