How Much Mulch Do I Need? Calculator + Suffolk County Pricing
3/14/2026
Calculate exactly how many yards of mulch you need for your garden beds, tree rings, and walkway borders. Includes pricing for black, brown, red, and natural mulch with delivery to Suffolk County.
The Quick Formula
Mulch is sold by the cubic yard. One cubic yard covers about 162 square feet at 2 inches deep — roughly the size of a single-car driveway.
Here is the formula:
Square Feet x Depth (inches) / 324 = Cubic Yards Needed
For example: a 20ft x 30ft area at 3 inches deep = 600 x 3 / 324 = 5.6 yards.
Common Coverage Estimates
| Area Size | 2" Deep | 3" Deep | 4" Deep |
|---|---|---|---|
| 500 sq ft | 3.1 yd | 4.6 yd | 6.2 yd |
| 1,000 sq ft | 6.2 yd | 9.3 yd | 12.3 yd |
| 2,000 sq ft | 12.3 yd | 18.5 yd | 24.7 yd |
| 5,000 sq ft | 30.9 yd | 46.3 yd | 61.7 yd |
Tip: For garden beds being mulched for the first time, use 3 inches. For annual top-off of existing beds, 2 inches is enough to refresh color and maintain weed suppression.
How to Measure Your Beds
- Break irregular shapes into rectangles. Measure length and width of each section separately.
- Round up. A 12.5 x 8 foot bed? Call it 13 x 8 = 104 sq ft.
- Subtract hardscape. Don't count patios, walkways, or large rock features.
- Add 10% buffer. Beds have edges and dips. A little extra prevents a second trip.
For tree rings, measure the diameter and use: diameter x diameter x 0.785 x depth / 324.
A 6-foot diameter tree ring at 3 inches = 6 x 6 x 0.785 x 3 / 324 = 0.44 yards — about half a yard per tree.
Mulch Types and Pricing at Eastern LM
We carry four mulch options, all triple-ground and sold by the cubic yard:
| Mulch Type | Price per Yard | Best For |
|---|---|---|
| Dark Natural | $20/yd | Large coverage, budget projects, contractors |
| Black Mulch | $30/yd | Garden beds, foundation plantings, clean aesthetic |
| Chocolate Mulch | $30/yd | Decorative borders, estate landscaping |
| Red Mulch | $38/yd | Accent beds, commercial properties, bold contrast |
All prices are per cubic yard at our Center Moriches yard. Delivery is available across Suffolk County.
When to Mulch on Long Island
The best time to apply mulch in Suffolk County is mid-April through May, after the last frost and before summer heat sets in. Fall mulching (October-November) protects root systems through winter.
Spring timeline:
- March–early April: Order mulch, prepare beds (pull weeds, edge borders)
- Mid-April: Apply mulch after soil has warmed
- May: Top off any thin spots before summer heat
Delivery to Your Site
We deliver mulch in bulk across all of Suffolk County from our yard in Center Moriches. Delivery fees are based on distance — you can check your exact fee by entering your address at checkout.
Popular delivery areas: Manorville, East Moriches, Shirley, Mastic, Eastport, Westhampton Beach, Quogue, Remsenburg, Riverhead, Hampton Bays, and Southampton.
Most orders deliver within the same week. Orders placed before 11 AM on weekdays may qualify for same-day delivery.
Use Our Online Calculator
Don't want to do the math? Use our Material Calculator — enter your bed dimensions and it calculates the cubic yards for you. Then add directly to your cart and check out online.
Or call us at (631) 874-6244 and we will help you figure out what you need.