Topsoil Volume Calculator Formula
Understand the math behind the topsoil volume calculator. Each variable explained with a worked example.
Formulas Used
Topsoil Needed
cubic_yards = vol_cuft / 27Approximate Weight
tons = vol_cuft / 27 * 1.1Volume
volume_cuft = vol_cuftVariables
| Variable | Description | Default |
|---|---|---|
area_sqft | Area(sq ft) | 500 |
depth_in | Topsoil Depth(in) | 4 |
depth_ft | Derived value= depth_in / 12 | calculated |
vol_cuft | Derived value= area_sqft * depth_ft | calculated |
How It Works
Topsoil Volume
Volume (cu ft) = Area (sq ft) x Depth (ft)
Cubic Yards = Volume / 27
Topsoil weighs approximately 1.1 tons per cubic yard depending on moisture. For new lawns, 4 to 6 inches of topsoil is recommended over compacted subgrade.
Worked Example
500 sq ft garden bed with 4 inches of topsoil.
area_sqft = 500depth_in = 4
- 01Depth = 4 / 12 = 0.333 ft
- 02Volume = 500 x 0.333 = 166.7 cu ft
- 03Cubic yards = 166.7 / 27 = 6.2 cu yd
- 04Weight = 6.2 x 1.1 = 6.8 tons
Frequently Asked Questions
How deep should topsoil be for a new lawn?
Apply 4 to 6 inches of quality topsoil for new lawns. Existing lawns being top-dressed typically need only 1/4 to 1/2 inch.
What is the difference between topsoil and garden soil?
Topsoil is the upper layer of native earth. Garden soil is typically topsoil amended with compost and other organic material for planting beds.
Ready to run the numbers?
Open Topsoil Volume Calculator