Topsoil Calculator: The Same Lawn, Thirty Yards or Two
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Take a 2,400-square-foot back lawn in a Howard County suburb. Rebuilt from scratch for seed or sod at 4 inches, it needs 800 cubic feet of material, which is 29.6 cubic yards. Dressed over living grass at a quarter of an inch, the same lawn takes 50 cubic feet, or 1.85 cubic yards. One job is a truckload, the other is a large trailer load, and nothing about the lawn changed between them. That is the whole reason to open a topsoil calculator before ordering: depth, not area, is what sets the size of the day.
Which of the two jobs the lawn actually needs
A rebuild is for ground that has been stripped, regraded, compacted by machinery or never had a growing layer to begin with. Topdressing is maintenance: a thin skim raked into living turf to level small hollows and add organic matter, shallow enough that the grass blades still stand clear of it.
The mistake that costs money is ordering rebuild depth for a maintenance job. The one that costs a season is the reverse, because a half-inch skim over sealed Piedmont clay does nothing. On clay that has been rolled flat by a builder, 4 inches of good soil on top still holds water like a blocked sink unless the subgrade underneath is broken up first.
| The lawn job | Depth to enter | What 2,400 square feet takes |
|---|---|---|
| Topdressing over living grass | 1/4 to 1/2 inch | 1.9 to 3.7 cubic yards |
| Leveling before overseeding | 1/2 to 1 inch | 3.7 to 7.4 cubic yards |
| New lawn from seed or sod | 4 to 6 inches | 29.6 to 44.4 cubic yards |
| Finish grade over fresh fill | 4 inches | 29.6 cubic yards |
Flower beds want 6 inches blended into what is below them, and raised vegetable beds 12, though for those a compost blend off the soil calculator does a better job than straight screened topsoil.
A back garden that is really three shapes
Few Maryland lawns are one rectangle. The usual shape is a main run, a strip down the side of the house and a piece behind the garage, and the multiple-areas option takes up to five of them in a single calculation. Rectangle handles each piece; circle asks for a diameter straight across the widest point, which covers a round bed cut into the turf.
Lengths and widths go in as feet. Depth goes in as inches, from 0.25 up to 24, and the bottom of that range exists precisely so a quarter-inch topdressing can be entered honestly rather than rounded up to one. Set the material before pressing calculate, since the selection is what fixes the weight used. The box marked add 5 percent extra for compaction and spillage covers the wheelbarrow and the spillage, and the answer comes back as cubic yards, tons and cubic feet, with the option to have it emailed over as a written quote.
Why something sold by the yard still shows you a weight
Screened topsoil is bought by the cubic yard, so the yard figure is the one that goes in the quantity box. The ton figure is still worth reading, because it is what turns up on the truck and what you will be moving by hand. This site publishes screened topsoil at roughly 2,200 lb for every cubic yard, which is 1.10 tons and an approximate figure. The 2,400-square-foot rebuild above is therefore about 32.6 tons of material, and knowing that before the day is the difference between hiring a machine and not.
The same volume in a blended garden mix would weigh less, at roughly 2,000 lb a yard, and in fill dirt more, at roughly 2,400. Rain moves it further again: a soaked pile is far heavier on the shovel and smears rather than raking clean, which is why the delivery should land in the week you intend to spread.
Working it through by hand: multiply the two sides in feet, divide the depth in inches by twelve and multiply it in, divide the result by twenty-seven, and multiply those yards by 1.10 for tons.
Where a lawn quietly takes more than the arithmetic said
Lawns are not flat, which is why a rebuild almost always takes slightly more than the calculation. Low corners swallow soil, edges need feathering into paths and beds, and the last wheelbarrow always goes somewhere unplanned. Tick the 5 percent allowance and then round the order up on top of it. Thirty yards calculated is a 32-yard order on a lawn with any fall to it.
The spreading is where the yardage earns out. Loosen the subgrade by at least an inch so the two layers knit together instead of stacking. Set the finished grade to fall away from the house, roughly a 6-inch drop across the first 10 feet. Firm the soil by pressing rather than stomping: settled properly, a footprint should sink about half an inch. On a low Coastal Plain lot, wait for the ground to drain before any of that, because saturated Shore ground compacts into a pan the moment a wheelbarrow crosses it.
Screened topsoil, garden blend or fill: what the select changes
Screened topsoil is natural surface soil put through a mesh that takes out stones, roots and clods, which is what makes it rake cleanly. It is the lawn and grading material: seeding, sodding, topdressing and the finish layer over a regrade. Good material looks dark, crumbles in the hand and smells of a forest floor rather than a pond; a moist handful should form a loose ball that breaks apart when you poke it.
The other two are different jobs. Compost-blended Garden Soil belongs in beds and planters. Fill Dirt is the subsoil that raises a grade, closes a trench or builds up a low corner, and it is sized on the dirt calculator. A regrade is usually two orders: fill to bring the level up, then Top Soil for the top 4 inches where the roots go. Set the quantity on the listing and pick the date there; delivery is arranged at checkout by ZIP code, and the delivery page covers what the driver needs at the drop spot.
Common questions
The result gives cubic yards and tons. Which one am I actually buying?
Cubic yards, for this material. Topsoil is sold by volume, so the yard figure is what goes in the quantity box and what a quote will be written against. The ton figure is for planning the work rather than the order: it tells you the weight landing on the drive, which is what decides whether the job is a weekend with a wheelbarrow or an afternoon with a machine.
Is the four inches the soil as tipped, or after it has settled?
The finished, settled level. Screened topsoil is not rolled the way base stone is, but it does firm down under watering and foot traffic, so spread it slightly proud and let it come down to the line. Press it lightly rather than compacting it hard; soil squeezed flat grows grass badly, and a footprint sinking about half an inch is the right feel.
The turf wraps around a circular planting island. What goes in for that piece?
Enter it as a circle within multiple-areas mode and measure the diameter straight across the center. A 10-foot round bed covers about 78.5 square feet, and at 6 inches that is 39.3 cubic feet, or 1.45 cubic yards. The form adds it to the lawn areas and returns one total, which is the point of entering everything in one run.
How do I check the lawn figure without the form?
Multiply the length by the width for square feet, turn the depth into feet by dividing the inches by twelve, multiply the two for cubic feet, then divide by twenty-seven. For the rebuild above: 2,400 square feet times 0.333 is 800 cubic feet, divided by 27 gives 29.6 cubic yards. A quarter inch is 0.0208 of a foot, which is where the 50 cubic feet and the 1.85 yards for topdressing come from.
Why does the same depth weigh differently depending on the material?
Because the weight comes from the material select, not from the shape you measured. Those 29.6 cubic yards are about 32.6 tons as screened topsoil at 1.10 tons per yard, roughly 29.6 as a blended garden mix at 1.00, and about 35.6 as fill dirt at 1.20. The volume is identical in all three. Choose the material first and the ton line will make sense.
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