Use Mulch Calculator to estimate mulch for garden beds, tree rings, and landscaping projects. Get cubic yards, bags, and an optional cost comparison.
Choose the bed shape, depth, and bag size. Cost fields are optional.
Mulch is sold in two different ways: loose material is usually priced by the cubic yard, while store-bought bags are labelled in cubic feet. That makes a quick garden measurement feel more complicated than it should. This page converts the same project into both units, then rounds the purchase amount so you can buy a usable quantity.
Start with the calculator above. The guide below explains the measurements, common depths, and cost choices without burying the tool under a very long article.
The calculator first turns your measurements into square feet. A rectangle uses length × width. A circle uses π × radius². A triangle uses base × height ÷ 2. A tree ring is the area of the large circle minus the open circle around the trunk. The selected depth then changes area into volume.
The extra percentage is added after the base volume is calculated. Bulk orders are rounded up to the nearest quarter-yard, which is a common practical ordering increment. Your local supplier may use a different minimum.
1 inch: a light cosmetic top-up where a healthy layer already exists.
2 inches: a normal refresh for established beds.
3 inches: a useful starting point for bare soil or a new installation.
4 inches: heavier coverage, best used only where the plants and drainage can handle it.
Divide the bed into simple rectangles, circles, or triangles. Calculate each part and add the areas together. For several identical rectangles, use the multiple-area option. For different sizes, run the calculator once for each section and add the recommended amounts.
Bags are tidy, easy to store, and convenient when a project can be completed in a few trips from the car. Bulk mulch usually makes more sense when you are covering a large front yard, several beds, or a commercial space. Price alone is not the full decision: delivery access, cleanup, storage, and the effort of moving the material all matter.
For a fair comparison, enter the actual bag price, the supplier’s price per cubic yard, delivery, and local sales tax. The calculator applies tax to the entered totals and shows the estimated difference. Treat the result as a planning estimate; suppliers may round quantities or calculate tax differently.
| Mulch amount | Depth | Approximate coverage |
|---|---|---|
| 1 cubic yard | 1 inch | 324 sq ft |
| 1 cubic yard | 2 inches | 162 sq ft |
| 1 cubic yard | 3 inches | 108 sq ft |
| 1 cubic yard | 4 inches | 81 sq ft |
| Bulk equivalent | Bag size | Equivalent bags |
|---|---|---|
| 1 cubic yard | 1 cu ft | 27 bags |
| 1 cubic yard | 1.5 cu ft | 18 bags |
| 1 cubic yard | 2 cu ft | 13.5 bags |
| 1 cubic yard | 3 cu ft | 9 bags |
The area is 200 square feet. The base volume is 200 × 3 ÷ 324 = 1.85 cubic yards. With 10% extra, the estimate is about 2.04 cubic yards.
The base volume is 250 × 2 ÷ 324 = 1.54 cubic yards. With 10% extra, it becomes about 1.70 cubic yards, or roughly 23 two-cubic-foot bags.
About 324 square feet at 1 inch, 162 square feet at 2 inches, 108 square feet at 3 inches, or 81 square feet at 4 inches.
One cubic yard is 27 cubic feet, so it equals 13.5 bags containing 2 cubic feet each. In practice, you would buy 14 full bags.
Two inches is usually enough for an existing bed that already has some mulch. Three inches is a common choice for bare soil or a new installation.
Five to fifteen percent is a sensible planning range. Ten percent works well for many home projects with curves, minor measurement differences, or settling.
Yes. Enter the outer and inner diameters. The tool subtracts the open center from the full circular area.
The volume calculation can provide a rough estimate, but playground surfacing has safety-depth and material requirements. Follow the product manufacturer and local safety guidance.
