Landscaping · Garden · Volume
Mulch
Calculator
Calculate cubic yards, cubic feet, and bags of mulch needed for any garden shape. Add multiple beds, choose mulch type, and get a cost estimate instantly.
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Cubic Yards
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Bags (2 cu ft)
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Est. Cost
Rectangle / Square Bed
For straight-edged garden beds, planting strips, or paths.
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beds
Quick depth presets
Circle / Tree Ring
For round garden beds or mulch rings around trees. For a full circle, leave inner radius at 0.
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trees
Multiple Garden Beds
Add up several different-sized beds to get a total. Enter L × W for each, all at the same depth.
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Mulch Type Selector
Choose your mulch type to see recommended depth, cost range, and calculate for a specific area.
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Cubic Yards
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cubic yards
Cubic Feet
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Bags needed
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Volume Visual
Cubic Yards
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Cubic Feet
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Bags
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Cost (bags)
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Mulch Estimate
How to Calculate Mulch Needed
To find mulch volume, calculate the area of your garden bed, multiply by the depth in feet, then convert to cubic yards (divide by 27). A standard recommendation is 2–4 inches of mulch for most garden beds.
Key Formulas
Volume (ft³) = Area (ft²) × Depth (ft) [depth in inches ÷ 12]
Volume (yd³) = Volume (ft³) ÷ 27
Bags needed = Volume (ft³) ÷ bag size (ft³)
Circle ring: Area = π × (outer_r² − inner_r²)
1 cubic yard = 27 cubic feet
1 cubic yard bulk ≈ 13.5 bags of 2 cu ft
Recommended depth: 2–3 in maintenance, 3–4 in new beds
How much mulch do I need for a 10×10 bed?
A 10×10 bed at 3 inches deep: Area = 100 sq ft. Volume = 100 × (3/12) = 100 × 0.25 = 25 cubic feet = 25/27 = 0.93 cubic yards. You need about 0.93 cubic yards or 13 bags of 2 cu ft mulch. At 2 inches: 0.62 yd³, 9 bags. At 4 inches: 1.23 yd³, 17 bags. For mulch purchases, round up to the nearest bag or half-yard to ensure complete coverage.
How deep should mulch be?
Recommended depths by use: Flower/perennial beds: 2–3 inches. Shrub borders: 3–4 inches. New planting beds: 3–4 inches. Tree rings: 3–4 inches (keep away from trunk). Vegetable gardens: 2–3 inches. Paths: 4–6 inches. Playgrounds: 6–12 inches. Too shallow (under 2") won't suppress weeds well. Too deep (over 4") can suffocate roots and create anaerobic conditions. Avoid "volcano mulching" — piling mulch against tree trunks causes rot and disease.
Is bags or bulk mulch more economical?
Bulk mulch (by the cubic yard) is almost always cheaper per cubic foot than bagged mulch. For example: 2 cu ft bags at $4.50 each = $2.25/cu ft = $60.75/yd³. Bulk delivered at $35/yd³ = $1.30/cu ft. That's 42% cheaper. The break-even point is typically around 2–3 cubic yards — below that, bags are convenient enough to justify the cost; above that, bulk delivery saves money. Bagged mulch is cleaner to handle, has consistent moisture, and is easier for small projects.
What is the best mulch for vegetable gardens?
For vegetable gardens, straw and wood chips are most popular. Straw is cheap, light, and decomposes to add organic matter. Wood chips (arborist chips) retain moisture and regulate temperature well but can tie up nitrogen as they decompose — add compost or nitrogen fertilizer to compensate. Shredded leaves are excellent and free if you have trees. Avoid cedar mulch near vegetables (natural oils can inhibit growth). Avoid dyed mulches near edibles. Red clover and other living mulches are also excellent options.