Mulch Volume Calculator

How many cubic yards or 2-cubic-foot bags of mulch do you need for a flowerbed or landscape area?

Inputs

2-4 in is standard for shrub beds; 1-2 in around annuals.

Result

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How to use this calculator

  • Enter the bed dimensions.
  • Pick a depth — 3 inches is the sweet spot for most beds.
  • Compare bag count vs cubic yard pricing to decide bulk vs bagged.

About this calculator

Mulch is sold by both bulk cubic yard and 2-ft³ bag. One cubic yard equals 13.5 bags, so a 1-yd³ pile saves a lot of bag-hauling. Most beds need 2-4 inches; deeper than that smothers roots.

Frequently asked

How deep should mulch be?+
2-4 inches for shrub beds. 1-2 inches around annuals to avoid burying stems.
When should I refresh mulch?+
Once a year is standard. Top off to 2-3 inches; don't pile it deeper, especially against tree trunks ("mulch volcanoes" rot bark).
Bulk vs bags?+
Bulk is cheaper per yard and reduces plastic, but you need a way to haul it. Bags are convenient for jobs under ~5 yards.
Does color-enhanced mulch hurt plants?+
No — modern mulch dyes are non-toxic. They fade in 1-2 years.
How much area does a yard of mulch cover?+
At 3 inches deep, 1 yd³ covers about 108 ft².

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