Mulch Calculator
Bed volume
Results
| Volume | — |
|---|---|
| Cubic yards | — |
| Bags | — |
How to Use This Mulch Calculator
Mulch ordering gets messy fast when you mix feet, inches, and "about three inches deep" into one guess. I have watched landscapers eyeball a bed and order two yards too many—then stack bags along the driveway for a month. This calculator converts bed length, width, and depth into cubic feet, cubic yards, and standard 2 cu ft bag counts so you can choose between bulk delivery and bagged pickup without a scratchpad.
Measure the mulch bed at its longest and widest points in feet, yards, meters, or inches. Enter desired depth—most landscape beds look right at 2 to 4 inches; paths and playgrounds sometimes go deeper. Hit Calculate for volume in cubic feet, bulk cubic yards, and the number of 2 cubic foot bags (the common bag size at garden centers).
Think of the bed as a shallow box sitting on the soil: you are filling that box with shredded bark or wood chips. Irregular beds with curves can be approximated as rectangles and adjusted upward, or broken into sections using our Square Footage Calculator for the footprint first. For heavier stone coverage, see the Gravel Calculator.
Mulch Calculator Formulas and Practical Applications
Volume math matches any rectangular prism—same structure as a concrete slab, but much shallower.
Step 1: Volume in cubic feet
V = Length × Width × Depth
Example: a 20 ft × 4 ft bed at 3 in depth (0.25 ft) holds 20 × 4 × 0.25 = 20 cubic feet.
Step 2: Cubic yards for bulk delivery
Cubic Yards = Cubic Feet ÷ 27
Step 3: Bag count
Bags = Ceiling(Cubic Feet ÷ 2)
Standard bagged mulch is 2 ft³ per bag. Bulk mulch from a landscape supplier is priced by the cubic yard—compare both numbers before you decide. Fresh mulch settles 20–30% over the first season, which is why replenishing annually at 2–3 inches rather than 6 inches upfront saves money long term.
Frequently Asked Questions
Bulk mulch or bags—which is cheaper?
Bulk delivery wins on large jobs—typically above 2–3 cubic yards—when you have wheelbarrow access. Bags cost more per cubic foot but make sense for small beds, sloped yards trucks cannot reach, or when you want to spread over several weekends.
How deep should mulch be around trees?
Keep mulch 2–4 inches deep and pull it back a few inches from trunks—volcano mulching against bark causes rot and pest problems. Wide, shallow rings beat tall piles every time.
Does mulch type change the volume I need?
Volume is the same regardless of material—shredded hardwood, cedar, or dyed mulch fill the same space. Weight differs, which matters for hauling but not for this cubic measurement.
Disclaimer. Informational only—not landscaping or horticulture advice. Settling and bed shape affect actual coverage.