How much mulch do I need?
Estimate mulch volume in cubic yards or bags for garden beds and landscaping. Enter your area dimensions to get started.
Mulch calculator
Choosing the Right Mulch Type
Mulch type affects moisture retention, weed suppression, soil temperature, and how often it needs replacing. The right choice depends on your plants, climate, and aesthetic preference.
Shredded Hardwood Bark: The most common landscape mulch. It decomposes slowly, stays in place well on slopes, and enriches soil as it breaks down. Best for flower beds, shrubs, and trees.
Cedar Mulch: Naturally repels insects and resists decay. Cedar has a distinct reddish color and pleasant aroma. It lasts longer than hardwood but can be more expensive. Ideal for paths, play areas, and around structures.
Pine Bark Nuggets: Large, chunky pieces that decompose very slowly. They are lightweight and allow water to penetrate easily. Best for trees, large shrubs, and areas where you want a natural woodland look.
Rubber Mulch: Made from recycled tires, rubber mulch never decomposes and requires no replacement. It provides excellent weed suppression and impact absorption. Best for play areas, paths, and permanent landscape beds.
Mulch Type Cheat Sheet
Use this reference to pick the right mulch for your garden:
| Type | Lifespan | Best For |
|---|---|---|
| Shredded Hardwood | 1–2 years | Flower beds, shrubs, trees, slopes |
| Cedar | 2–3 years | Paths, play areas, around structures, decorative beds |
| Pine Bark Nuggets | 2–3 years | Trees, large shrubs, natural woodland areas |
| Rubber | Permanent | Play areas, paths, permanent beds, low-maintenance areas |
Mulch depth recommendations
- Flower beds and garden beds: 2-3 inches
- Playground areas: 6-9 inches (use engineered wood fiber)
- Walkways and paths: 3-4 inches
- Around trees: 2-3 inches, keep mulch away from trunk
One cubic yard of mulch covers about 100 square feet at 3 inches deep. A 2-cubic-foot bag covers about 8 square feet at 3 inches deep.
Worked example
For example, for a 10×5 ft garden bed, 3 inches deep:
- Area = 10 × 5 = 50 sq ft
- Volume = 50 × (3 ÷ 12) = 12.5 cu ft
- Cubic yards = 12.5 ÷ 27 = 0.46 yd³
- 2-cu-ft bags needed = 12.5 ÷ 2 = 6.25 → 7 bags
- For beds over 100 sq ft, buy bulk mulch by the cubic yard instead
Common mistakes
| Mistake | Why it matters |
|---|---|
| Applying too deep | More than 3 inches prevents water from reaching roots — 2-3 inches is ideal |
| Piling mulch against tree trunks | Create a donut shape — mulch against bark causes rot and pest problems |
| Using fresh mulch near plants | Fresh mulch can rob nitrogen from soil as it decomposes — use aged mulch for beds |