Mulch Calculator

Mulch volume is calculated as: Volume (cubic yards) = Area (sq ft) * Depth (inches) / 12 / 27. To convert cubic yards to cubic meters, multiply by 0.76455.

One cubic yard of mulch covers approximately 324 square feet at 1 inch depth, 162 square feet at 2 inches depth, 108 square feet at 3 inches depth, or 81 square feet at 4 inches depth.

Since 1 cubic yard equals 27 cubic feet: you will need 13.5 bags of 2 cu ft size, or 9 bags of 3 cu ft size, to equal one cubic yard.

A depth of 2 to 3 inches (5 to 7.5 cm) is recommended for flower beds and around trees to conserve moisture, regulate soil temperature, and suppress weeds without suffocating root networks.

Yes, applying mulch deeper than 4 inches can starve soil of oxygen, prevent water from reaching root networks, and encourage rot or pests near the trunks of trees (often called 'mulch volcanoes').

Organic wood mulches (such as shredded bark, wood chips, and pine needles) decompose over 1 to 3 years. This decomposition enriches the soil but requires top-dressing maintenance.

Determine circular area: Area = π × (Diameter ÷ 2)². Then apply the depth volume calculation: Volume = Area × Depth ÷ 12 ÷ 27.

Organic mulch consists of wood, bark, or compost which breaks down and feeds the soil. Inorganic mulch includes river rocks, gravel, and rubber, which do not decompose but do not enrich the soil.

Yes. Mulch acts as a physical barrier that absorbs the kinetic impact of raindrops, slows runoff velocity, and anchors loose topsoil on slopes.

Shredded wood mulch weighs between 600 and 1,000 pounds (270 to 450 kg) per cubic yard, depending on moisture content. Wet mulch can weigh significantly more.

One cubic yard of mulch equals 13.5 two-cubic-foot bags or 9 three-cubic-foot bags.

A 2 to 3-inch depth of organic bark or hardwood mulch is recommended to suppress weeds and retain soil moisture without suffocating roots.

Dry wood bark mulch weighs about 400 to 800 lbs per cubic yard, while wet or dense bark mulch can weigh up to 1,000 lbs.

Subtract the tree trunk area (π × r₁²) from the total mulch ring area (π × r₂²), then multiply by your target depth.

ASTM playground standards require a 6-inch compacted depth of shredded rubber mulch for critical fall height protection up to 10 feet.

Premium dyed hardwood mulches (black, dark brown, red) retain vibrant color for 12 to 18 months before requiring a top dressing.

Wood mulch does not attract termites directly, but thick beds over 4 inches retain ground moisture which can attract damp-loving insects if piled against home foundations.

Volcano mulching is piling mulch high against tree trunks. It traps moisture against bark, leading to trunk rot, fungal decay, and root suffocation.