Estimate the volume and cost of mulch needed for your landscaping project. Enter the area dimensions and desired depth to get cubic yards, number of bags, and estimated cost.
Mulch is sold by volume — usually cubic yards from a landscape supplier, or in cubic-foot bags from a garden center. Estimating the right amount before you order saves the two most common mistakes: showing up with not enough and making a second trip, or ordering twice what you needed and having a pile sitting in the driveway.
This calculator converts your bed dimensions and desired depth into cubic yards, number of standard bags, and a cost estimate. Enter the length, width, and depth of the area you want to cover; the calculator returns the volume in both cubic yards (for bulk delivery) and in standard 2-cubic-foot bags.
The right depth depends on the mulch type and bed: 2 inches for fine mulches (shredded leaves, pine fines), 3 inches for medium textures (most bark mulches), 4 inches for coarse materials (large bark nuggets, wood chips). Mulch decomposes and settles over time, so most beds need a thin refresh annually rather than complete replacement.
30 ft × 4 ft strip around the front of a house, 3 in deep. Volume: (30 × 4 × 3) / 324 = 1.11 cubic yards Bulk at $35/yd: $39. Bagged at $4/bag (2 ft³): ~$60 for 15 bags. For under a cubic yard, the bagged convenience often outweighs the cost.
Front bed: 25 × 6, depth 3" → (25 × 6 × 3)/324 = 1.39 yd³ Side bed: 40 × 4, depth 3" → 1.48 yd³ Back bed: 20 × 8, depth 4" → 1.98 yd³ Tree rings (3 trees): 8 × 8 each, depth 3" → 3 × 0.59 = 1.78 yd³ Total: ≈ 6.6 cubic yards. At $30/yd bulk delivered: $198. Bagged at $4/bag would cost ~$355 — bulk delivery is a clear win at this scale.
Use this for any landscaping project involving mulch, wood chips, or similar loose material. The same math applies to gravel, decomposed granite, or rubber mulch — just substitute the price.
Typical project rules: - New beds: deeper layer (3–4 inches) to suppress weeds - Established beds: refresh 1–2 inches annually - Around trees: 2–3 inches in a ring 2–3 feet from the trunk, NEVER touching the trunk ("mulch volcano" rot) - Vegetable beds: 1–2 inches of fine mulch (pine fines, leaf mold)
Color-enhanced mulches (dyed black, brown, red) typically cost 20–40% more than natural and fade in 3–6 months in full sun.
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Recommended: 2-4 inches for most beds
Cubic Yards
1.11
Bags (2 cu ft)
15
Estimated Cost
$38.89
| Measurement | Value |
|---|---|
| Area | 120 sq ft |
| Depth | 3 inches |
| Volume | 30.0 cubic feet |
| Cubic Yards | 1.11 |
| Standard Bags (2 cu ft) | 15 bags |
| Large Bags (3 cu ft) | 10 bags |
| Estimated Cost (bulk) | $38.89 |