Mulch Calculator

How much mulch do I need?

Answer first: find the landscape area in square feet, multiply by mulch depth in feet to get cubic feet, then divide by 27 for cubic yards. If buying bags, divide the required cubic feet by the bag volume.

For a rectangular bed, area is length × width. For a circular bed, area is π × radius². If you already measured the area from a site plan, map or landscaping drawing, choose the known-area option and enter the square feet directly.

Worked example: 20 × 10 ft bed at 3 inches

Bulk mulch vs bags

Bulk mulch is usually quoted by the cubic yard. Bagged mulch is sold by a labelled cubic-foot volume. One cubic yard equals 27 cubic feet, so a cubic yard is equivalent to 13.5 two-cubic-foot bags before waste, rounding or product compression.

The calculator lets you enter both a bulk price per cubic yard and a price per bag. It then compares material-only estimates using the rounded bulk order and whole-bag count. Delivery, taxes, minimum bulk orders and labor are intentionally excluded because they vary by supplier and location.

What mulch depth should I use?

The right depth depends on the material, purpose, existing mulch and plant conditions. Instead of forcing one universal recommendation, AcreSketch lets you enter the depth you actually plan to install.

If an existing bed already contains mulch, estimate the additional depth you need rather than automatically calculating the full finished depth. Avoid piling mulch directly against tree trunks or plant stems, and follow local horticultural guidance for the landscape you are maintaining.

Irregular garden beds

For an L-shaped bed, split the area into rectangles and add the square footage. For a strongly irregular landscape bed, estimate or measure the total square footage first, then use the known-area option. This keeps area measurement separate from material ordering and avoids pretending an irregular shape is a perfect rectangle.

If several beds are roughly the same size, use the quantity field. If they differ substantially, calculate them separately and add their required volumes before ordering.

Frequently asked questions