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Uniform worksheet · Home Improvement

Form RET-208 · Effective August 2026 · Borrower’s copy

Garden Mulch Calculator

Calculate mulch for your garden beds.

Inputs

$

Volume

0 cu yd

Bags (2 cu ft)

0

Estimated Cost

$0

How to Use This Garden Mulch Calculator

See Methodology

Our free mulch calculator determines exactly how many cubic yards of mulch you need for any garden bed shape. Enter your bed dimensions (length and width in feet), desired depth in inches, and the number of identical beds. The calculator converts to cubic yards and estimates total cost based on your per-bag price.

Coverage reference: One cubic yard of mulch covers 324 sq ft at 1 inch deep, 162 sq ft at 2 inches, or 108 sq ft at 3 inches. For a standard 20 × 10 ft bed at 3 inches deep, you need 1.85 cubic yards — roughly 28 bags at 2 cubic feet each.

How to measure irregular beds. For L-shaped beds, split the shape into two rectangles, calculate each separately, and add the totals. For curved beds, measure the longest length and widest width, then multiply by 0.85 to approximate the curved area. For beds around trees, calculate the full circle and subtract the trunk area (measure diameter in inches, divide by 12 for feet).

Mulch depth by application. Vegetable gardens: 2 inches (allows soil to warm in spring). Flower beds: 2-3 inches. Tree rings: 3 inches, kept 6 inches away from the trunk. Pathways: 3-4 inches for comfortable walking. Never exceed 4 inches — excessive mulch suffocates roots, traps too much moisture, and can cause stem rot.

Mulch types and costs. Hardwood dyed mulch ($30-$50/cu yd) decomposes in 1-2 years and enriches soil. Cedar mulch ($40-$70/cu yd) lasts 2-3 years and naturally repels insects. Pine straw ($30-$45/cu yd) is acidic — ideal for azaleas, blueberries, and rhododendrons. Rubber mulch ($80-$120/cu yd) lasts 10+ years but does not improve soil and can overheat in direct sun. Bulk delivery is significantly cheaper than bags: most suppliers offer 2-5 cubic yard minimums with delivery fees of $50-$150.

When to hire a professional. For beds larger than 200 sq ft, consider hiring a landscaper for installation — they can grade the bed, install edging, and apply mulch evenly. For steep slopes or terraced beds, professional installation prevents erosion and ensures proper depth.

Related Topics

mulch calculator ·how much mulch do i need ·cubic yards of mulch ·mulch cost estimator ·garden mulch estimator ·

Frequently Asked Questions about Garden Mulch

  • How do I calculate how much mulch I need?

    Measure the length and width of your bed in feet. Multiply to get square footage, then multiply by your desired depth in feet (3 inches = 0.25 feet). Divide the result by 27 to convert cubic feet to cubic yards. For example: a 20 ft × 10 ft bed at 3 inches deep = 20 × 10 × 0.25 = 50 cubic feet ÷ 27 = 1.85 cubic yards.

  • How deep should I spread mulch?

    2-3 inches is ideal for most garden beds. Vegetable gardens benefit from 2 inches to allow soil warming. Tree rings and shrub beds can use 3 inches. Never exceed 4 inches — excessive mulch traps moisture against stems and roots, leading to rot, and can suffocate shallow root systems. Keep mulch 3-6 inches away from plant stems and tree trunks.

  • How much does a yard of mulch cost?

    Hardwood dyed mulch: $30-$50 per cubic yard. Cedar mulch: $40-$70. Pine straw: $30-$45 per cubic yard. Rubber mulch: $80-$120. Bulk delivery typically adds $50-$150 depending on distance and minimum order (most suppliers require 2-5 cubic yards minimum). Bagged mulch at retail runs $4-$8 per 2 cubic feet, which is 2-3× more expensive per yard than bulk.

  • What is the difference between hardwood and cedar mulch?

    Hardwood mulch decomposes within 1-2 years, enriching soil with organic matter — ideal for flower beds and vegetable gardens. Cedar mulch decomposes slowly (2-3 years), contains natural oils that repel insects, and resists compaction — better for decorative beds and areas near the house. Pine straw is acidic, making it ideal for acid-loving plants like azaleas, blueberries, and rhododendrons.

  • How often should I reapply mulch?

    Organic mulches decompose and need replenishing every 1-2 years. Check depth in spring — if it's below 2 inches, add a fresh layer. Avoid piling new mulch on top of old decomposed material; rake back the old layer, add fresh mulch, and restore depth to 2-3 inches. Rubber mulch lasts 10+ years but doesn't improve soil and can overheat in direct sun.

  • Can I put mulch directly on top of grass?

    No. Mulch placed directly on grass will not kill it — the grass will grow through, and you'll have weeds competing with your plants. For new beds, sheet-mulch with cardboard or newspaper first, then apply 3-4 inches of mulch on top. This smothers the grass and creates a clean bed without digging.

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