How Much Topsoil Do I Need for a New Lawn?
Quick answer: a new lawn needs 4 to 6 inches of topsoil over the graded subsoil. One cubic yard covers about 81 square feet at 4 inches, so a 1,000-square-foot lawn takes roughly 12–13 cubic yards. The topsoil calculator gives you the exact yards and bag count — here's how to get the depth and the order right.
How deep should topsoil be for grass?
For a new lawn, spread 4 to 6 inches of topsoil over the graded subsoil before you seed or lay sod. Grass roots need that depth to establish; seeding into a thin skim of soil over hardpan gives you a lawn that browns out the first dry spell.
Top-dressing an existing lawn is the opposite job — a light 1/4 to 1/2 inch raked into the turf to level minor dips and add organic matter, not a thick layer that smothers the grass.
How much does a yard of topsoil cover?
Coverage is all about depth. One cubic yard (27 cubic feet) of topsoil spreads over:
- 81 sq ft at 4 inches (new lawn)
- 54 sq ft at 6 inches
- 648 sq ft at 1/2 inch (top-dressing)
A worked example
Say you're starting a 1,000-square-foot lawn at 4 inches deep:
- 1,000 ÷ 81 ≈ 12.3 cubic yards
Topsoil settles after the first few waterings, so order about 10% extra — call it 13–14 yards delivered. Plug your real area and depth into the topsoil calculator and it adds the overage for you.
Topsoil vs. fill dirt — don't mix them up
If you also need to raise the grade or fill low spots, do that with cheaper fill dirt first, compact it, then cap it with your topsoil growing layer. Topsoil is the nutrient-rich screened soil for growing; fill dirt is inert subsoil for building up. The fill dirt calculator handles the layer underneath.
Buying tips
- Order by the cubic yard. Bulk delivery is far cheaper than bags for anything lawn-sized — bags only make sense for a small patch.
- Get screened topsoil, ideally a topsoil-compost blend for new lawns.
- Order ~10% extra for settling and grading losses.
Finishing the beds around the lawn too? The mulch calculator sizes the mulch layer for your borders.
Frequently asked questions
How many cubic yards of topsoil for a lawn?+
For a new lawn at 4 inches deep, one cubic yard covers about 81 square feet, so a 1,000-square-foot lawn needs roughly 12–13 cubic yards. Enter your lawn area and depth in the topsoil calculator for an exact figure.
How deep should topsoil be for grass?+
Lay 4 to 6 inches of topsoil over the graded subsoil before seeding or laying sod, so roots have room to establish. To refresh an existing lawn, top-dress with just a 1/4 to 1/2 inch and rake it in.
Should I use topsoil or fill dirt for a lawn?+
Use topsoil for the growing layer — it's the nutrient-rich screened soil grass roots into. Use cheaper fill dirt only to raise grade or fill low spots underneath, then cap it with topsoil before seeding.