Estimate how much mulch you need to cover a garden bed or landscaped area, plus an optional cost estimate.
Volume needed is simply area × depth. A 2 to 4 inch (5 to 10 cm) layer is the common recommendation — thick enough to suppress weeds and retain moisture, but not so thick that water and air can't reach the soil.
Mulch is commonly sold in bulk by the cubic yard, or in bags measured in cubic feet or liters. Compare the total cubic yardage from this calculator against your supplier's bag size or bulk delivery minimum to figure out how many bags (or how many truckloads) to order.
The volume calculation is the same regardless of mulch type, but denser materials (like rubber mulch) may settle less over time than lighter organic mulches, which can affect how often you need to top it up.
Not necessarily — a thin existing layer can often be topped up rather than replaced, as long as the combined depth doesn't get excessive.
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