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How Much Topsoil Do You Need for a New Lawn?

Depth rules for sod and seed, a 500 and 1,000 square-foot walk-through, and when to grade before you order soil.

Updated August 25, 2026

Start with the finished grade, not the seed bag

A new lawn fails more often from a bad grade than from the wrong grass. Topsoil is what you put on after the high spots are cut and the low spots are obvious. If the yard still ponds after rain, adding two inches of soil will not fix the drainage. Fix the pitch first, then calculate the finishing layer.

Penn State Extension asks for a minimum 4–6 inches of firmed quality topsoil to establish turf. Illinois Extension wants six inches or more of well-prepared soil. Nebraska Extension says replace topsoil to about 4 inches after rough grade before sod. Four inches is this site’s lawn preset; six inches gives seed a little more drought buffer. Going thinner than 3 inches on a new lawn is how you get a green carpet that browns out in the first dry week because the roots hit clay or fill.

The numbers this site uses

Cubic yards = square feet × depth in inches ÷ 324 (NIST: 1 yd³ = 27 ft³). We treat a cubic yard of moist screened topsoil as 1.35 tons. Penn State Extension asks for 4–6 inches of firmed quality topsoil for a new lawn. The homepage default is a 20 × 25 foot rectangle (500 sq ft) at 4 inches: 500 × 4 ÷ 324 = 6.17 yards, shown as 6.2 yards and 8.4 tons.

LawnAreaDepthYardsTonsPickup loads (~2.5 yd)
Small backyard500 sq ft4 in6.28.42.5
Typical suburban1,000 sq ft4 in12.316.64.9
Same yard, seed bed1,000 sq ft6 in18.525.07.4
Top-dress only1,000 sq ft1.5 in4.66.21.9

Sod and seed do not want the same surface

Sod wants a firm, raked bed. If the soil is fluffy, the rolls bridge and dry out. After you spread 4 inches, water it, let it settle, then rake again. You will lose a fraction of an inch. That is why a 10% waste toggle exists on the calculator. Use it when the grade is rough or you know you will be cutting around beds.

Seed wants a looser half-inch on top of that firm bed. You still calculate the imported soil at 4 to 6 inches. The extra fluff is finishing work, not a second truckload. If you are overseeding an old lawn, you are not in this article — use the 1 to 2 inch top-dress preset instead.

How to measure a yard that is not a rectangle

Walk the lawn as you would mow it. Ignore the house pad and the driveway. Split odd shapes into rectangles and a leftover triangle or half-circle. Add the areas, then run one depth. The calculator can do a circle, a triangle, and an L. An L is two rectangles that do not overlap — do not count the corner twice.

A kidney-shaped backyard is usually a rectangle plus a half-circle. A 30 × 40 rectangle with a 20-foot-diameter bay is 1,200 + about 157 = 1,357 square feet. At 4 inches that is 16.8 yards, about 22.7 tons. Round the supplier conversation to 17 yards and ask what their truck holds.

What “screened topsoil” means on a lawn

Screened means the yard ran the pile through a screen so the big clods, roots, and rocks are gone. It is still mineral soil. It is not potting mix. For a lawn you want something that will firm up, not a bark-heavy blend that stays spongy. Ask for a lawn-grade screened soil. If the pile looks like compost, it will shrink and you will be short.

Fill dirt is the wrong product for the last 4 inches. Use it only to raise a hole or build a berm, then cap it with screened topsoil. If a contractor offers one cheap “site soil” for the whole job, ask whether it will take seed. Many will not.

Ordering, delivery, and spreading

A tandem dump truck often carries 10 to 14 yards. A 1,000 sq ft lawn at 4 inches (12.3 yards) is one truck for many yards, or a truck plus a leftover if they run 10-yard loads. Ask the capacity before you assume two trips. Angi lists delivery often $50–$150 per trip; those fees are not in the calculator’s material total unless you type a supplier quote into the total-price field.

Spread the pile from the back of the lot toward the street so you are not driving over finished grade. A 6.2-yard pile for a 500 sq ft lawn is a meaningful mound. If you are doing it with a rake and a wheelbarrow, budget a day, not an hour.

Check the order before the truck leaves

Look at the load. If it is full of clay lumps or trash, say so before it is dumped. Once it is on the driveway, you own the argument. Compare the ticket yards to the calculator. A “10-yard” load that looks like six is a conversation to have immediately, not after the lawn is sodded.

Sources

Numbers on this page are planning figures. Follow the link for the original table or standard. Full list: Sources.

  1. NIST. Handbook 44, Appendix C — General Tables of Units of Measurement. 1 cubic yard = 27 cubic feet. Coverage identity: 27 × 12 = 324 sq ft at 1 inch.
  2. USDA NRCS. Soil Bulk Density / Moisture / Aeration (Soil Quality Kit). Oven-dry bulk density varies by texture; silt loam example ≈ 1.33 g/cm³. Not the same as a wet truckload.
  3. South Dakota State University Extension. Bulk Density is an Indicator of Soil Health. Ideal bulk-density bands by texture (NRCS table). 1 g/cm³ ≈ 62.3 lb/ft³.
  4. Penn State Extension. Lawn Establishment. Minimum 4–6 inches (firmed) of quality topsoil to establish turf; blend into subsoil.
  5. University of Illinois Extension. Preparing Lawn Soil and Site. Aim for six inches or more of well-prepared soil before seed or sod.
  6. University of Nebraska–Lincoln Extension. Establishing Lawns From Sod. Replace topsoil to a minimum of about 4 inches after rough grade; sod often cut 0.25–0.5 in thick.
  7. University of Arkansas System Division of Agriculture. Establishing a Lawn From Sod (FSA-2042). About 19 cubic yards of topsoil make a 6-inch layer over 1,000 sq ft; sample the upper 4–6 inches.
  8. Angi. What Is the Cost of Topsoil? [2026 Data]. National homeowner bands: about $10–$55/yd³ by type; screened loam $18–$26; delivery often $50–$150/trip.
  9. Lawn Love. How Much Does Topsoil Cost in 2026?. Bulk topsoil commonly cited at about $10–$50 per cubic yard, plus delivery.
  10. University of Minnesota Extension. Raised bed gardens. Mounded beds often 6–8 in high. Mix about ½–⅔ topsoil with ⅓–½ plant-based compost. Deeper (1–2 ft) if the bed sits on pavement.
  11. Penn State Extension (York County Master Gardeners). Raised Bed Gardening. A common framed bed is 4 × 8 ft by 1 ft deep — enough for most annual vegetable roots.
  12. U.S. Code of Federal Regulations. 49 CFR 571.110 — Tire selection and rims; motor vehicle. Payload / vehicle capacity weight is the number on the driver’s door-jamb label — not a generic “half-ton.”

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