The easiest way to estimate mulch is to measure the total square footage of your landscape beds and choose a depth. In Michigan, a 3 inch layer is a common target because it gives good weed suppression and a clean finished look without burying plants too deeply.
Mulch Yardage Formula
Square feet x depth in inches / 324 = cubic yards of mulch.
Example: 500 square feet x 3 inches / 324 = 4.6 cubic yards. Most homeowners round up slightly so the crew has enough material to finish evenly.
Mulch Coverage by Depth
- 2 inches deep: one cubic yard covers about 162 square feet.
- 3 inches deep: one cubic yard covers about 108 square feet.
- 4 inches deep: one cubic yard covers about 81 square feet.
When to Use 2, 3, or 4 Inches
Use 2 inches when the beds already have a healthy mulch layer and only need a refresh. Use 3 inches for most standard installs. Use 4 inches when beds are bare, thin, or need stronger coverage, while keeping mulch pulled back from plant stems and tree trunks.
Where Mulch Bros Installs
Mulch Bros installs mulch across Southeast Michigan, including the priority service areas below.
Mulch Calculator FAQ
How do I calculate how many yards of mulch I need?
Multiply the length and width of each bed to get square footage, multiply by depth in inches, then divide by 324. The result is the cubic yards of mulch needed.
How much area does one cubic yard of mulch cover?
One cubic yard covers about 162 square feet at 2 inches deep, 108 square feet at 3 inches deep, or 81 square feet at 4 inches deep.
What mulch depth should I use in Michigan?
A 3 inch layer is a common target for Michigan landscape beds because it gives good coverage without burying plants too deeply.