Mulch Calculator
Enter your bed's length, width, and depth to see how much mulch you need — in cubic yards and in 2 ft³ or 3 ft³ bags, with a depth comparison so you can weigh 2" vs 3" vs 4".
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Cubic yards of mulch
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How much mulch do I need?
Multiply your bed's length and width in feet by the depth converted to feet, then divide by 27 to get cubic yards. One cubic yard equals 13.5 of the common 2 ft³ bags or 9 of the larger 3 ft³ bags. Bulk delivery by the yard is usually half the price of bags once you need more than about a yard. Three inches is the sweet spot for most beds — deep enough to suppress weeds, not so deep it suffocates roots.