Outdoor & Garden
Mulch Calculator
Estimate how much mulch you need for garden beds, landscaping areas, tree rings, and yard projects based on your space and desired mulch depth.
Measure Your Bed
Measure the length and width of your garden bed, or use the diameter for a round area.
Choose A Depth
Most mulch projects use about 2 to 4 inches, depending on whether you are refreshing or starting fresh.
Estimate Bags Or Yards
The calculator shows cubic feet, cubic yards, and estimated bags so you can shop smarter.
Mulch Calculator
Calculate How Much Mulch You Need
Enter your garden bed shape, measurements, mulch depth, and bag size. Results are estimates, so it is smart to add a little extra for uneven beds, settling, and touch-ups.
Estimated Result
Enter Your Measurements
Visual Guide
Mulch Calculator Guide
Use this quick guide to understand the basic mulch formula, common depths, and how bag estimates work.
Mulch Depth Guide
How Deep Should Mulch Be?
A light refresh may only need around 2 inches. A common new mulch layer is often around 3 inches. Deeper coverage may use around 4 inches, especially for larger landscape areas, but too much mulch can create problems.
Keep mulch away from plant stems and tree trunks. Mulch piled against trunks can trap moisture and create pest or disease problems.
Common Mulch Depths
- 2 inches: Light refresh or existing beds
- 3 inches: Standard garden bed coverage
- 4 inches: Deeper coverage for some landscape areas
Formula
Mulch Calculation Formula
For Rectangular Beds
Area = Length × Width
Cubic Feet = Area × Depth In Inches ÷ 12
For Round Beds
Area = 3.14 × Radius × Radius
Cubic Yards = Cubic Feet ÷ 27
For Bag Estimates
Bags Needed = Cubic Feet ÷ Bag Size
Round up to the next whole bag so you do not run short.
Outdoor & Garden
Plan More Outdoor Projects
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