United States Mulch
Calculate mulch from a few simple inputs in the United States.
About United States Mulch
Mulch is a volume problem, not an area problem: you need area multiplied by depth. Because US beds are measured in square feet and mulch depth in inches, divide the depth by 12 before multiplying to get cubic feet, then divide by 27 for cubic yards — the unit bulk suppliers quote. That conversion is where most people go wrong, and it matters financially: bulk mulch is typically a third to a half the price per cubic yard of the equivalent in 2 cubic foot bags, so the calculator reports both the yardage to order in bulk and the bag count and cost if you buy retail. Two to three inches is the usual target; deeper than four inches holds too much moisture against stems and can starve roots of oxygen.
Formulas
Mulch volume in cubic feet
mulch cu ft = bed area (sq ft) x mulch depth (in) / 12
Volume in cubic yards
cu yd = cu ft / 27
- 27
- Cubic feet in one cubic yard
Bag count
Bags = ceiling(cu ft / bag volume)
Frequently Asked Questions
Should I buy bulk or bagged mulch?
Bulk usually costs far less per cubic yard, and one cubic yard replaces about 13.5 standard 2 cubic foot bags. Bags win when you need under roughly one yard, have nowhere to dump a delivery, or want to carry the mulch through a house or up steps.
How deep should mulch go?
Two to three inches is the sweet spot: enough to block light from weed seeds and slow evaporation, not enough to waterlog the soil. Keep mulch pulled back a few inches from trunks and stems — piling it against bark invites rot and rodents.
How often will I need to top it up?
Organic mulches such as shredded hardwood break down and settle, losing roughly an inch a year. Most beds need a one-inch refresh annually rather than a full replacement, so measure the existing depth before ordering.
Related Calculators
United States specifics
- Currency
- $ USDUS Dollar
- Region
- North America
- Country code
- US
- Amounts look like
- $1,234,567.89
- Dates look like
- Mar 9, 2026
- Units
- imperialWeek starts Sunday
In United States, imperial units are in everyday use.
Results on this page are expressed in USD (US Dollar). Figures are estimates for general planning — confirm current rates and thresholds with the relevant United States authority before relying on them.