Calculate exactly how much mulch you need for gardens, flower beds, and landscaping projects. Get instant estimates in cubic yards and bags with cost comparisons.
10% typical for coverage and irregular shapes
Ready to calculate
Enter your area dimensions
$37.5/yd³
2-3" deep • Natural, decomposes slowly
$47.5/yd³
2-3" deep • Insect-resistant, aromatic
$42.5/yd³
2-3" deep • Long-lasting, attractive
$100/yd³
1-2" deep • Permanent, no decay
$42.5/yd³
2-3" deep • Red/Black/Brown colors
Why expert review matters
Every calculator is reviewed by certified professionals to ensure accuracy.Hawkin's CCP, CEP certification ensures professional-grade precision.
How much mulch do I need?
Multiply length × width × depth to get cubic feet, divide by 27 for cubic yards, add 10% waste.
How deep should mulch be?
2-3 inches for organic mulch (hardwood, cedar, pine), 1-2 inches for rubber mulch.
Bulk or bagged mulch?
Bulk is cheaper for 3+ cubic yards. Bags are convenient for small projects under 3 yards.
How much does mulch cost?
Organic mulch: $30-55/yd³ bulk, $4-6/bag. Rubber: $80-120/yd³, $7-10/bag.
Our mulch calculator determines the amount needed based on your area's dimensions and desired depth. For rectangular areas, we calculate length × width. For circular areas, we use π × radius². The calculator then multiplies by your depth (converted to feet) to get cubic feet, divides by 27 for cubic yards, and applies a waste factor to account for irregular shapes and coverage variations.
Formula
Rectangular: Length × Width × (Depth ÷ 12) = Cubic Feet
Circular: π × Radius² × (Depth ÷ 12) = Cubic Feet
Cubic Feet ÷ 27 × (1 + Waste %) = Cubic Yards needed
| Depth | Coverage per Cubic Yard | Bags per 100 sq ft | Best For |
|---|---|---|---|
| 1" | 324 sq ft | 2-3 | Light refresh over existing mulch |
| 2" | 162 sq ft | 4-5 | Standard flower beds and gardens |
| 3" | 108 sq ft | 6-7 | Weed control and moisture retention |
| 4" | 81 sq ft | 9-10 | Heavy weed areas and tree rings |