Mulch Calculator
Estimate the amount of mulch needed to cover an area such as a garden and calculate the cost.
Area dimensions
Mulch specifications
Mulch needed (cubic yards):
Mulch needed (cubic feet):
Total cost:
Choosing the right mulch depth
Volume = area × depth, converted to cubic yards (the standard unit mulch is sold and delivered in) since mulch bags and bulk delivery pricing are typically quoted per cubic yard. Depth matters more than people expect — too shallow a layer doesn't suppress weeds or retain moisture effectively, while too deep a layer can suffocate plant roots and encourage fungal growth against tree trunks and stems.
Frequently asked questions
What mulch depth is generally recommended? 2–4 inches is a common range for most garden beds — enough to suppress weeds and retain soil moisture without smothering plant roots, though preferences vary by mulch type and plant.
Should mulch touch tree trunks or plant stems? Generally no — piling mulch directly against trunks/stems (sometimes called "mulch volcanoes") traps moisture against the bark and can encourage rot and pest problems; leave a small gap around the base.
How often does mulch need to be replaced? Organic mulch (bark, wood chips) breaks down over time and typically needs topping up annually or every couple of years, depending on the material and climate.