Mulch Calculator
Calculate volume of mulch (cubic metres or yards) and number of bags for garden beds, landscaping, and tree rings.
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How to Calculate Mulch
Multiply length by width for square footage. Multiply by depth in feet. Divide cubic feet by 27 for cubic yards. One cubic yard covers 162 sq ft at 2 inches deep.
Frequently Asked Questions
How deep should mulch be?
50-75 mm (2-3 in) for flower beds and around trees. 75-100 mm (3-4 in) for weed suppression. Never pile mulch against tree trunks or plant stems.
How many bags of mulch do I need?
A standard 50-litre (2 cu ft) bag covers roughly 1 m² (12 sq ft) at 50 mm (2 in) deep. For 10 m², you need about 10 bags at that depth.
How much does mulch cost?
Bagged mulch: $3-$6 per 2 cu ft bag. Bulk delivery: $25-$50 per cubic yard. A 10 m² (100 sq ft) bed at 75 mm (3 in) deep costs $30-$60 in bulk or $75-$120 in bags.
What type of mulch is best?
Hardwood mulch: best for flower beds, decomposes slowly. Pine bark: acidic, ideal for azaleas and blueberries. Cedar mulch: repels insects naturally. Rubber mulch: lasts longest but doesn't improve soil. Avoid dyed mulch near edible gardens.
When is the best time to mulch?
Late spring after soil warms up, or fall before first frost. Avoid mulching too early in spring — it keeps soil cold and delays plant growth. Refresh or top up annually as organic mulch decomposes 25-50% per year.