How Much Mulch Do I Need?
The amount of mulch you need depends on the size of your garden beds and the depth you want to apply. Here's how to figure it out quickly.
🧮Mulch Calculator — get your exact bag and cubic yard count
Enter your exact dimensions for a personalized estimate →
The quick formula
Mulch needed (cu yd) = Length (ft) × Width (ft) × Depth (in) ÷ 324
Then multiply by 13.5 to convert cubic yards to 2 cu ft bags.
Step-by-step: how to measure your beds
- Measure each bed — Walk the perimeter with a tape measure. Record length and width in feet. For curved beds, break them into rough rectangles.
- Add up your areas — For multiple beds, measure each one separately and add them together.
- Choose a depth — 2–3 inches is standard for existing beds; 3–4 inches for new beds.
- Plug into the formula — Or use the Mulch Calculator to get bags and cubic yards instantly.
Coverage table — how far does 1 cubic yard go?
| Depth | Coverage per cubic yard |
|---|---|
| 1 inch | 324 sq ft |
| 2 inches | 162 sq ft |
| 3 inches | 108 sq ft |
| 4 inches | 81 sq ft |
| 6 inches | 54 sq ft |
1 cubic yard = 13.5 bags (2 cu ft each)
Coverage per bag (2 cu ft bag)
| Depth | Coverage per bag |
|---|---|
| 1 inch | 24 sq ft |
| 2 inches | 12 sq ft |
| 3 inches | 8 sq ft |
| 4 inches | 6 sq ft |
How much to buy: quick examples
| Bed size | At 2” depth | At 3” depth |
|---|---|---|
| 5 × 10 ft | 4 bags | 6 bags |
| 10 × 10 ft | 7 bags | 10 bags |
| 10 × 20 ft | 13 bags | 19 bags |
| 20 × 20 ft | 25 bags | 38 bags |
Rounded up. Assumes no waste factor — add 5–10% for irregular shapes.
Bags vs. bulk: which should you buy?
- Under 1 cubic yard (13 bags): bags from a garden center are usually more convenient.
- 1–3 cubic yards: compare bag cost vs. bulk delivery — bulk often wins above 1.5 yards.
- Over 3 cubic yards: bulk delivery is almost always cheaper and less work.
How much does mulch cost?
Bagged mulch typically runs $4–$8 per 2 cu ft bag at big-box stores. Bulk delivery varies by region: $25–$60 per cubic yard is typical. Enter your local price into the Mulch Calculator for a cost estimate.
Frequently Asked Questions
How many bags of mulch do I need for a 10×10 garden bed?
A 10×10 ft bed (100 sq ft) at 3 inches deep needs about 0.93 cubic yards or 13 bags (2 cu ft each), before adding a waste factor. Round up to 14 bags to be safe.
How deep should I apply mulch?
Apply 2–3 inches for existing beds that already have some mulch, or 3–4 inches for new beds or areas where weed suppression is a priority. Avoid piling mulch against plant stems.
How much does a bag of mulch cover?
A standard 2 cubic foot bag covers 24 sq ft at 1 inch deep, 12 sq ft at 2 inches, or 8 sq ft at 3 inches.
How many bags of mulch are in a cubic yard?
There are 13.5 bags (2 cu ft each) in one cubic yard. If you need more than 2–3 cubic yards, bulk delivery is usually cheaper.
Should I buy bags or bulk mulch?
Bags are convenient for small areas (under 1–2 cubic yards) or where a truck cannot access. Bulk delivery is significantly cheaper per cubic yard for larger projects.