Landscaping
Mulch Calculator
Estimate mulch volume in cubic feet and cubic yards, with optional settling overage and bag count.
Landscaping
Calculator inputs
Mulch Calculator Results
Results update in your browser as you edit inputs. They are planning estimates, not complete shopping lists.
Enter project dimensions to calculate material quantity.
Assumptions
- The bed is treated as a rectangle with even depth.
- Existing mulch, slopes, plant displacement, and settling are simplified into the optional overage factor.
- Bag count is shown only when a bag size is entered.
- For bulk mulch, use cubic yards. For bagged mulch, use the bag count based on the bag size printed on the package.
- Any cost estimate uses only the unit price you enter. No store or local price data is used.
Formula
- Cubic feet = length x width x depth in feet.
- Cubic yards = cubic feet divided by 27.
- Overage volume = base volume x (1 + settling / overage factor).
- Bags = overage cubic feet divided by bag size, if a bag size is entered.
Example calculation
Example: 500 sq ft bed
A 25 ft by 20 ft bed is 500 sq ft. At 2 in deep, it needs about 83.33 cubic feet, or 3.09 cubic yards, before overage.
Common mistakes
- Entering depth in feet instead of inches.
- Forgetting mulch settles after installation.
- Using bag count without checking the bag size.
FAQ
What mulch depth should I use?
Many garden beds use roughly 2 to 3 inches, but plant needs and existing mulch depth matter.
Does this calculate bulk delivery price?
No. It estimates quantity only. You can enter your own bag price for a simple cost estimate.