Mulch Calculator
Calculate exactly how much mulch you need for garden beds, landscaping, and playgrounds. Get estimates in cubic yards, bags, and weight.
Area Size
Mulch Depth
Mulch Type
Your Results Will Appear Here
Enter your area size, choose a mulch depth and type, then click “Calculate” to see how much mulch you need.
Top-Rated Mulch & Garden Supplies
Hand-picked products to help you get the best results on your project.
Vigoro
Vigoro Premium Brown Mulch, 2 cu ft Bag
- ✓Natural wood
- ✓Color-enhanced
- ✓Weed suppression
Rubberific
Rubberific Premium Rubber Mulch, 0.8 cu ft
- ✓Won't fade or decompose
- ✓Playground safe
- ✓12-year warranty
Scotts
Scotts Nature Scapes Color Enhanced Mulch, 2 cu ft
- ✓Color-lock technology
- ✓1-year color guarantee
- ✓Natural wood
Garden Weasel
Garden Weasel Cultivator Hand Tool
- ✓Cultivate & weed
- ✓Ergonomic grip
- ✓Durable steel
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How to Use This Mulch Calculator
Step 1: Measure Your Area
Measure the length and width of your garden bed in feet, or enter the total square footage directly if you know it.
Step 2: Choose Depth
Select 2” for a refresh, 3” for standard coverage, or 4” for heavy weed suppression. Don’t go over 4 inches.
Step 3: Select Mulch Type
Choose from shredded hardwood, pine bark, rubber, or stone. Each type has different weight and cost per cubic yard.
Step 4: Review Options
Compare bulk pricing vs. bagged mulch. For large areas, bulk delivery is significantly more cost-effective.
Step 5: Get Results
Click Calculate to see cubic yards, bag counts, weight estimate, and cost comparison for your project.
Understanding Mulch Types
Mulch Comparison
| Type | Cost/Yard | Weight/Yard | Lifespan |
|---|---|---|---|
| Shredded Hardwood | ~$30 | ~800 lbs | 1–2 years |
| Pine Bark | ~$35 | ~600 lbs | 2–3 years |
| Rubber Mulch | ~$90 | ~1,200 lbs | 10+ years |
| Stone / Gravel | ~$50 | ~2,700 lbs | Permanent |
Mulch Depth Guide
More isn’t always better. Too much mulch (over 4 inches) can suffocate roots, create a moisture barrier that repels water, and harbor pests. Keep mulch 2–3 inches away from plant stems and tree trunks to prevent rot and disease.
Pro Tips for Mulching
Apply 2–4 Inches — No More
Too much mulch suffocates plant roots and creates a moisture barrier. Spread mulch evenly to 2–4 inches deep, with 3 inches being ideal for most garden beds.
Keep Mulch Away from Stems and Trunks
Leave a 2–3 inch gap between mulch and plant stems or tree trunks. “Volcano mulching” (piling mulch against trunks) causes bark rot, disease, and pest problems.
Refresh Annually, Replace Every 2–3 Years
Add 1–2 inches of fresh mulch each spring to maintain depth as organic mulch decomposes. Every 2–3 years, remove old mulch and replace it completely for best results.
Lay Landscape Fabric Underneath
For best weed suppression, lay landscape fabric before spreading mulch. This creates a double barrier against weeds while still allowing water and nutrients through.
Bulk Delivery Saves Money on Large Projects
For areas needing more than 5 cubic yards, bulk delivery is 40–60% cheaper than bagged mulch. Call your local landscape supply for pricing—most deliver for $50–$100.
Frequently Asked Questions
At the standard 3-inch depth, 100 square feet needs about 25 cubic feet, or roughly 0.93 cubic yards of mulch. That’s approximately 13 bags of 2 cu ft mulch. Our calculator gives you exact numbers based on your chosen depth and area.
Bagged mulch is easier for small projects—it’s pre-measured and easy to transport. Bulk mulch (delivered by the cubic yard) is significantly cheaper for larger areas. As a rule of thumb, if you need more than 5 cubic yards, bulk delivery saves time and money.
The ideal mulch depth is 2–4 inches. Use 2 inches for a light refresh of existing mulch, 3 inches for standard coverage, and 4 inches for heavy weed suppression or new beds. More than 4 inches can suffocate plant roots and prevent water penetration.
Top up mulch annually in spring to maintain the 2–3 inch depth as it decomposes. Full replacement is typically needed every 2–3 years for organic mulch. Rubber and stone mulch last much longer—10+ years—but don’t add nutrients to soil.
Shredded hardwood is the most popular choice for flower beds—it decomposes to enrich soil and stays in place well. Pine bark nuggets are great for acid-loving plants like azaleas and blueberries. Rubber mulch is best for playgrounds, and stone/gravel works well for xeriscaping and drainage areas.
One cubic yard (27 cubic feet) equals approximately 13.5 bags of 2 cu ft mulch or 9 bags of 3 cu ft mulch. Knowing this helps you compare prices between bagged and bulk mulch. Generally, bulk mulch is 40–60% cheaper per cubic yard.