Free Mulch Calculator (2026): How Much Mulch Do You Need?

Enter the area you want to mulch and the depth of coverage. The calculator returns cubic yards needed, equivalent bag count, and an optional cost estimate. The math follows the industry-standard conversion: square feet × depth (in feet) ÷ 27 cubic feet per cubic yard.

How the Mulch Math Works

Mulch is sold by the cubic yard. One cubic yard equals 27 cubic feet. To figure out how many cubic yards an area needs, you find the area in square feet, multiply by the depth in feet (depth in inches divided by 12), then divide by 27.

cubic_yards = (area_sqft × depth_inches ÷ 12) ÷ 27

Bagged mulch is usually sold in 2 cubic foot bags. Thirteen and a half bags equal one cubic yard, so we round up to be safe.

Three Real-World Examples

Example 1 — Small foundation bed (10 × 4 ft, 3" deep)

Area is 40 sqft. At 3 inches deep, that's 40 × 0.25 = 10 cubic feet, or 0.37 cubic yards. At a typical bulk price of $45 per yard, the material cost is about $17 — but most mulch yards charge a $50–100 delivery fee for under 1 yard, so it's usually cheaper to buy 5 bags at $5–7 each (~$25–35 total) and pick them up yourself.

Example 2 — Whole-front-yard refresh (60 × 18 ft, 2" deep)

Area is 1,080 sqft. At 2 inches deep, that's 1,080 × 0.167 = 180 cubic feet, or 6.7 cubic yards. Round up to 7 yards. At $45/yard plus a $75 delivery fee, total material cost is $390. That same coverage in 2 cubic-foot bags would be 90 bags (~$540), making bulk delivery meaningfully cheaper.

Example 3 — Commercial property strip (200 × 6 ft, 3" deep)

Area is 1,200 sqft. At 3 inches deep, that's 1,200 × 0.25 = 300 cubic feet, or 11.1 cubic yards. Round up to 12 yards. At $40/yard (bulk pricing kicks in over 10 yards for many suppliers) plus a $75 delivery fee, the total comes in around $555. A landscape contractor bidding this job would typically charge $1,800–2,400 installed (material + labor + margin), depending on edge conditions and obstacles.

How Deep Should You Apply Mulch?

Most cooperative-extension programs recommend 2–4 inches of mulch around ornamental beds. Deeper than 4 inches and you risk smothering roots, attracting rodents, and creating anaerobic conditions that breed fungal problems. The University of Maryland Extension specifically recommends a maximum of 3 inches for organic mulches around shrubs and trees.

• Around trees: 2–3 inches, kept 3–6 inches back from the trunk to avoid "mulch volcanoes" that rot bark.
• Ornamental beds: 2–3 inches for visual coverage and weed suppression.
• Playground / pathway: 3–4 inches for cushioning and longevity (most municipal specs are 4 inches).
• Vegetable garden: 1–2 inches of light mulch like straw — deeper wood mulch can tie up nitrogen as it decomposes.

Frequently Asked Questions

How many cubic yards is a pickup truck?

A standard 8-foot pickup bed holds about 2.5 cubic yards level-loaded, or roughly 3 cubic yards heaped. A short 6-foot bed holds about 1.5 yards level. Mulch is light enough that most half-ton trucks can carry their rated capacity, but always check the manufacturer payload rating — soaked mulch can weigh 1,000–1,500 lb per cubic yard.

How many 2 cubic foot bags equal a cubic yard?

13.5 bags equal one cubic yard. Since bags don't come in halves, you'll round up to 14. Most retailers run sales at 5-for-$10 or 5-for-$15 in spring, which can bring bagged mulch close to bulk-delivery pricing for small projects.

Should I subtract for shrubs and plants when calculating area?

For most residential beds, no — the difference is small and you'd rather have an extra wheelbarrow than run short. For large commercial beds or playgrounds, subtract any obstacle that's larger than ~12 square feet at ground level (tree wells, large boulders, exposed root flares).

What's the markup on mulch when a contractor installs it?

Most landscape contractors mark mulch up 50–100% from their cost, depending on market. A $45/yard mulch bought in bulk often bills at $75–95/yard installed, which covers labor, equipment, edging detail, and margin. Industry margin targets for mulch installs are typically 35–50% gross — see the landscaping profit margins guide for detail.

How long does mulch last before it needs to be refreshed?

Organic mulches (hardwood, pine bark, cedar) typically need a 1-inch refresh every 1–2 years to maintain visual coverage and weed suppression. Dyed mulches fade in 6–12 months in full sun. Stone or rubber mulch lasts essentially indefinitely but requires occasional cleaning. Most commercial maintenance contracts include an annual mulch refresh as a separate line item.

Sources & Further Reading

• University of Maryland Extension — Mulches and Mulching in the Home Landscape
• Penn State Extension — Landscape Mulches
• Washington State University Hortsense — Cultural Practices: Landscape Mulches

Related Calculators & Guides

• Full Landscaping Pricing Calculator (labor + materials + margin)
• How to Price Landscaping Jobs
• Free Landscaping Estimate Template
• Landscaping Profit Margins by Service