Mulch Calculator
Calculate cubic yards and cubic feet of mulch needed for any garden bed or landscape area based on area and desired depth.
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Bags (2 cu ft) —
Bed Area —
Professional Full parameters & maximum detail ▾
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Cost Estimate
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How to Use This Calculator
- Enter the area length and width in feet, or the total area in square feet.
- Enter the desired depth in inches.
- Results show cubic yards, cubic feet, and number of 2 cu ft bags needed.
Formula
Cubic yards = Area (sq ft) × Depth (in) ÷ 12 ÷ 27
Bags (2 cu ft) = ceil(Cubic yards × 13.5)
Example
Example: 200 sq ft garden bed, 3 inch depth → 1.85 cubic yards → 25 bags (2 cu ft each).
Frequently Asked Questions
- Most landscape beds benefit from 2–3 inches of mulch. At 2 inches, mulch suppresses most annual weeds and retains soil moisture. At 3 inches, it provides better control of perennial weeds and insulates roots against temperature swings. Avoid applying more than 4 inches — thick mulch can prevent rainfall from reaching plant roots, harbor pests, and cause bark rot around tree bases (a condition called "mulch volcano"). Pull mulch back 2–3 inches from tree trunks and plant stems. Refresh the layer each spring as organic mulch breaks down over one growing season.
- A standard 2-cubic-foot bag of mulch equals 0.074 cubic yards. You need about 13.5 bags to make one cubic yard. Bags are convenient for small projects or tight-access areas, but bulk delivery by the cubic yard is far more economical for larger beds. A typical pickup truck bed (standard short-bed) holds about 1.5–2 cubic yards safely. A full-size dump truck delivers 10–14 cubic yards. Always calculate your volume in cubic yards first, then decide whether bags or bulk delivery is more practical for your project size and site access.
- Use the formula: Cubic Yards = Area (sq ft) × Depth (in) ÷ 12 ÷ 27. First convert depth from inches to feet by dividing by 12, then multiply by the area to get cubic feet, then divide by 27 to get cubic yards. For example, a 200 sq ft bed at 3 inches deep: 200 × 3 ÷ 12 ÷ 27 = 1.85 cubic yards. This calculator performs the conversion automatically when you enter area and depth. Always add 10% extra to account for settling and low spots in the bed.
- One cubic yard equals 27 cubic feet. A standard bag of mulch contains 2 cubic feet, so you need 27 ÷ 2 = 13.5 bags per cubic yard. Some brands sell 3-cubic-foot bags, which means 9 bags per cubic yard. Always check the bag size label before calculating. For large projects of 5+ cubic yards, bulk mulch delivered by the yard is typically 30–50% cheaper than purchasing bags. The calculator can display results in both cubic yards and equivalent bag counts for your convenience.
- Yes — mulch depth is the key factor in weed control. A 2-inch layer blocks light from reaching weed seeds and suppresses most annual weeds. A 3-inch layer handles tougher perennial weeds more effectively. Going beyond 4 inches provides diminishing returns and creates the problems of oxygen deprivation and rot. Using a weed barrier fabric beneath mulch improves results but can impede water and nutrient movement over time. Shredded wood mulch generally outperforms bark chips for weed control because it forms a denser mat. Replenish mulch annually as it decomposes.