Mulch Calculator
Calculate exactly how much mulch you need for your garden beds, flower borders, and landscaping projects.
Mulch Calculator
Durable, decomposes slowly
Mulch Depth Guide
2-3 inches: Standard depth for most garden beds and around trees. Provides adequate weed suppression.
4 inches: Recommended for high-weed areas and steep slopes. Maximum depth for most plants.
Don't over-mulch: Too much mulch can suffocate roots and harbor pests. Keep mulch 2-3 inches from tree trunks.
How to Use This Mulch Calculator
Our mulch calculator helps you determine the exact amount of mulch needed for any landscaping project. Simply select your area shape (rectangle, circle, or custom area), enter the dimensions, choose your mulch type and desired depth, and get instant calculations for cubic yards, bags, and more.
Mulch Types Explained
Hardwood Mulch
Made from deciduous trees like oak and maple. Decomposes slowly, adds nutrients to soil, and provides excellent weed control. Ideal for established perennial beds.
Pine Bark
Lightweight and slightly acidic. Perfect for acid-loving plants like azaleas, rhododendrons, and blueberries. Resists compaction better than hardwood mulches.
Cedar Mulch
Natural insect-repelling properties make it ideal near homes. Pleasant aroma, slow decomposition, and attractive reddish color. More expensive but longer-lasting.
Cypress Mulch
Naturally resistant to decay and insects. Retains its color well and has a pleasant natural appearance. Good for high-moisture areas.
Rubber Mulch
Made from recycled tires. Permanent solution that never decomposes. Excellent for playgrounds and high-traffic areas. Does not attract insects or provide nutrients.
Straw
Lightweight, inexpensive, and temporary. Best for vegetable gardens and strawberry beds. Decomposes quickly and may contain weed seeds.
How Much Mulch Do I Need?
The amount of mulch depends on your area size and desired depth:
- 2 inches: Minimum depth for weed suppression around established plants
- 3 inches: Standard depth for most garden beds and around trees
- 4 inches: Recommended for high-weed areas and slopes
- 6 inches: Maximum depth, typically only for pathways
For new beds, 3-4 inches is recommended. For refreshing existing mulch, 2 inches is usually sufficient to restore appearance and function.
Mulch Calculation Formula
The basic formula for calculating mulch volume is:
Cubic Yards = (Area in sq ft × Depth in inches) ÷ 324One cubic yard of mulch covers approximately:
- 162 sq ft at 2 inches deep
- 108 sq ft at 3 inches deep
- 81 sq ft at 4 inches deep
Tips for Mulching
- Keep mulch away from trunks: Leave a 2-3 inch gap around tree trunks and plant stems to prevent rot and pest problems.
- Don't over-mulch: More than 4 inches can suffocate roots and create habitat for harmful pests.
- Prepare the area: Remove weeds before mulching for best results. Consider laying landscape fabric for persistent weed problems.
- Refresh annually: Top up mulch each spring to maintain the recommended 3-inch depth as it decomposes.
- Order extra: Consider ordering 10-15% more than calculated to account for settling and uneven coverage.