What is Mulch?
The Mulch Calculator determines how much mulch you need for flower beds, garden paths, around trees, and landscaping. Mulch suppresses weeds, retains soil moisture, regulates soil temperature, and improves garden aesthetics.
Mulch is sold in bags (typically 2 cubic feet each) for small projects or by the cubic yard for larger areas. One cubic yard of mulch covers approximately 108 square feet at 3 inches deep, which is the recommended depth for most applications.
Common mulch types: wood chips, bark mulch, straw, pine needles, rubber mulch, stone/gravel, and cocoa hull mulch. Organic mulches decompose over 1-2 years, adding nutrients to soil. Inorganic mulches (stone, rubber) last longer but don't improve soil.
For vegetable gardens, 2-3 inches of organic mulch is ideal. For perennial beds and around trees, 3-4 inches is recommended. Never mulch deeper than 4 inches — too much mulch can suffocate roots and create fungal problems.
Formula
Volume = Area × Depth Cubic Feet = Length (ft) × Width (ft) × Depth (inches) / 12 Cubic Yards = Cubic Feet / 27 Bags (2 cu ft) = Cubic Feet / 2
Coverage per cubic yard at different depths: 2 inches: 162 sq ft 3 inches: 108 sq ft 4 inches: 81 sq ft
Example — 20ft × 10ft bed, 3" deep: CF = 20 × 10 × 3/12 = 50 cubic feet CY = 50/27 = 1.85 cubic yards Bags = 25 bags (2 cu ft each)
How to use this Mulch Calculator?
1. Enter the length and width of your area in feet. 2. Enter desired mulch depth in inches (3" is standard). 3. See cubic yards, cubic feet, number of bags needed, and cost estimate.
Tip: For irregular shapes, divide into rectangles and calculate each separately. For circular areas, use area = π × radius².