Gravel and mulch calculator
Enter the area and the depth. Jobmath gives cubic yards, tons for gravel, sand and topsoil, and bags for mulch.
How it's calculated
Each step, in the order Jobmath runs it.
| Step | Formula |
|---|---|
| Volume | Length × width × depth ÷ 12 = cubic feet |
| Cubic yards | Cubic feet ÷ 27 |
| Tons | Cubic yards × tons per cubic yard |
| Mulch bags | Cubic feet ÷ bag size, rounded up |
Common depths
Starting points; your site and local code decide.
| Use | Depth |
|---|---|
| Mulch bed | 2 to 3 in |
| Gravel path | 2 to 3 in |
| Driveway base (crushed stone) | 4 to 6 in |
| Topsoil for new lawn | 4 to 6 in |