Mulch Calculator — Cubic Yards, Bags & Depth Guide

L × W or direct square feet in; cubic yards, 2 cu ft bags and dollars out.

Quick answer: Enter bed size and depth to get cubic yards, 2 cu ft bag counts and cost for shrubs, trees or weed suppression, with depth guidance plants like.

📏 Measure twice: fresh mulch settles — a raked 3-inch layer compresses to about 2 inches within weeks. Check depth with a ruler after spreading, and keep it 2–3 inches clear of every trunk and stem.

How to use

  1. Measure the bed: length × width in feet, or enter the area directly.
  2. Pick a depth preset — 2 in shrubs, 3 in weed barrier, 4 in trees — or a custom depth.
  3. Read cubic yards, cubic meters and the 2-cu-ft bag count.
  4. Optional: enter a price per bag for the total cost.

About this tool

Mulch is cheap by the bag and misleading by the yard, so this calculator does the honest conversion: enter your bed as length × width or a direct square-foot figure, pick 2, 3 or 4 inches of depth (or a custom depth), and get cubic yards, cubic meters and the number of 2-cubic-foot bags to load into the trunk. Depth guidance is built in because more is not better: shrubs like 2 to 3 inches, trees want 3 to 4 inches, and weed suppression needs about 3 inches of coverage to actually block light. There is a cost field for bag pricing, and a warning about mulch volcanoes — piling mulch against trunks rots bark and invites insects. Nothing is uploaded; it is all local math.

FAQ

How much does mulch cost?
Bagged 2 cu ft mulch runs about $3–$6 per bag (hardwood at the low end, cedar, dyed or rubber at the high end). Bulk delivered mulch is typically $30–$70 per cubic yard including drop-off — usually half the bagged price per yard once you need more than about 5 yards.
How deep should mulch be?
Shrubs and beds: 2–3 inches. Trees: 3–4 inches maximum. Weed suppression: about 3 inches to block light. Deeper than 4 inches suffocates roots and invites rot and rodents — this calculator caps its sensible presets at 4 inches for a reason.
How many 2 cu ft bags are in a cubic yard?
A cubic yard is 27 cubic feet, so 27 ÷ 2 = 13.5 — buy 14 bags per yard. The calculator rounds every figure up because running short mid-bed is the actual worst outcome.
How much area does one cubic yard cover?
At 2 inches deep, one yard covers about 162 sq ft; at 3 inches, about 108 sq ft; at 4 inches, about 81 sq ft. The output shows the exact coverage per yard for whatever depth you chose.
What is a mulch volcano?
Piling mulch against a tree trunk until it looks like a volcano. It holds moisture against the bark, rots it, and invites insects and disease. Keep mulch 2–3 inches clear of the trunk and never touch the root flare — a donut, not a volcano.

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