Mulch Calculator
Calculate how much mulch you need for your landscaping project. Get estimates in cubic yards, cubic feet, and number of bags.
Recommended: 2-3" for most beds, 4" for paths, 2" for refreshing existing mulch
Enter your bed dimensions to calculate mulch needed.
How It Works
Our mulch calculator multiplies length × width × depth to determine the volume needed. We convert the depth from inches to feet, then calculate cubic feet and cubic yards (1 cubic yard = 27 cubic feet).
Bulk mulch is typically sold by the cubic yard and is more economical for large projects. Bagged mulch (usually 2 or 3 cubic feet per bag) is easier for small projects and easier to transport without a truck.
We recommend 2-3 inches of mulch for most applications. This provides good weed suppression and moisture retention without suffocating plant roots or creating pest habitat.
Frequently Asked Questions
How deep should mulch be?
Apply 2-3 inches for most garden beds and around trees. Use 4 inches for paths and playgrounds. Don't exceed 4 inches as it can suffocate roots and create pest habitat. For refreshing existing mulch, 1-2 inches is usually sufficient.
Bulk vs. bagged mulch: which is better?
Bulk is cheaper for projects over 3-4 cubic yards (about 13-14 bags). Bags are convenient for small projects and don't require a truck or trailer. Bulk is typically $30-50/cubic yard delivered; bags are $3-6 each ($50-100/cubic yard equivalent).
How often should I replace mulch?
Most mulch needs refreshing annually and full replacement every 2-3 years. Hardwood and bark mulch last longer than pine or cypress. Top up with 1-2 inches each spring after clearing old, matted mulch.
What type of mulch is best?
Hardwood mulch is durable and widely available. Pine bark is acidic (good for azaleas and rhododendrons). Cedar and cypress resist decay. Dyed mulch lasts longer but may contain recycled wood with contaminants. Rubber mulch is best for playgrounds.
Should mulch touch plant stems?
No! Keep mulch 2-3 inches away from plant stems and tree trunks. Mulch against stems traps moisture and promotes rot and disease. Create a "mulch volcano" is harmful— mulch should be flat or slightly mounded away from the trunk.