Mulch Calculator
Work out how many cubic yards or bags of mulch a bed needs at your chosen depth — before you order a yard too many.
Mulch needed
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2 cu ft bags —
Estimated cost —
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How it works
Cubic yards = area (sq ft) × depth (in) ÷ 324Frequently Asked Questions
How much mulch do I need for 100 square feet?
At the standard 3-inch depth, about 0.93 cubic yards — one yard covers roughly 108 sq ft at 3 inches, or 162 sq ft at 2 inches.
How many bags equal a cubic yard?
13.5 of the common 2 cu ft bags, or 27 of the 1 cu ft bags. Bulk delivery is usually cheaper beyond 2–3 yards.
How deep should mulch be?
2–3 inches for beds (weed suppression without suffocating roots); keep it a few inches clear of trunks and stems to prevent rot.