Topsoil calculator guide

Topsoil is usually bought for one of three jobs: leveling a low spot in an existing lawn, building up grade before laying new sod or seed, or filling in after excavation work like removing a tree stump or an old structure. Each of these has a slightly different typical depth, which is the main variable to get right before calculating volume.

Screened versus unscreened topsoil

Screened topsoil has had large rocks, roots, and construction debris removed and is the right choice for a lawn or planting area, since it spreads evenly and does not leave hidden obstacles under new grass. Unscreened fill dirt is cheaper and is meant for building up grade under a structure, driveway, or area that will not be planted, not for a finished lawn surface. Confirming which type a supplier is quoting matters more for topsoil than for most other materials, since the two look similar in a photo but perform very differently once in place.

How much topsoil for common jobs

Leveling a low spot typically uses 1 to 3 inches of topsoil, feathered out from the deepest point so the transition to the surrounding lawn is not abrupt. Preparing a new lawn area before seed or sod usually calls for 4 to 6 inches over the existing grade, enough for roots to establish without hitting compacted subsoil right away. Filling a hole from stump removal or similar work depends entirely on the hole's depth, but the same coverage math applies once you know the volume of the void: at 6 inches deep, one cubic yard covers about 54 square feet.

Worked example

A low spot 8 feet by 8 feet, filled 2 inches deep, is 64 square feet of area. At 2 inches deep, one cubic yard covers about 162 square feet, so 64 divided by 162 comes out to roughly 0.4 cubic yards, which most suppliers round up to a half yard minimum order.

Weight and delivery

Topsoil weighs close to a ton per cubic yard, more when wet, so a delivery of even a few cubic yards can be several tons total. Confirm truck access to the drop point before scheduling delivery, and have a tarp or a clear section of driveway ready, since a bulk topsoil pile left directly on grass for more than a day or two can smother it.

Get your exact figures

The gravel and mulch calculator lets you enter your specific area and depth and choose topsoil as the material, returning cubic yards, cubic feet, and estimated weight in one step, which is faster and more accurate than working the conversion by hand for an odd shaped area.

Field procedure before you order

Measure the work area after removing loose leaves, thatch, broken roots, and demolition debris. For a rectangle, measure length and width in feet, then multiply them. For an irregular lawn patch, split it into smaller rectangles or triangles, write each area on a sketch, then add the areas before entering the total in the calculator.

Check depth with fixed reference points instead of guessing by eye. Drive short stakes at 6 to 10 foot intervals, stretch mason line between them, and measure down from the line to the existing soil with a ruler. On a larger lawn, a 10 foot straight board helps show crowns and dips that are not visible when standing above the area.

Remove high spots before filling low spots. Cutting 1 inch off a raised edge can reduce the topsoil order more than adding soil across the full area. If the existing soil is compacted, loosen the top 2 to 3 inches with a garden fork or tiller before adding new material. This reduces the risk of a slick layer between old soil and new soil.

Mark sprinkler heads, drain grates, valve boxes, cleanouts, edging, and buried cable routes before spreading soil.
Keep finished soil about 1 inch below hard edges such as walks and patios so mulch, seed, or sod does not wash onto pavement.
Spread in lifts no thicker than 3 inches when working by hand, then rake and lightly firm each lift before adding more.
Water lightly after placement to settle dust and reveal low pockets, but do not soak the area until it turns muddy.

Equipment, working dimensions, and labor planning

For less than about 1 cubic yard, a wheelbarrow, shovel, bow rake, landscape rake, and 4 foot level are usually enough. A typical contractor wheelbarrow carries about 4 to 6 cubic feet when it is heaped, so 1 cubic yard can mean 5 to 7 loaded trips. Smaller homeowner wheelbarrows often take 8 to 10 trips per cubic yard.

For 2 to 5 cubic yards, plan the delivery drop within 50 to 100 feet of the work area if possible. Longer carries add time quickly because the return trip is empty but still consumes walking distance. Two people with one wheelbarrow can often place and rough rake 3 cubic yards in a half day if access is flat and dry.

Use a square point shovel for loading from the pile and a bow rake for moving soil across the surface. Use a landscape rake for final grading because the wider head removes ridges. A lawn roller is not a substitute for grading. If used at all, it should be filled lightly and passed once or twice, not used to compact the area hard.

Item to check	Practical figure	Why it matters
Wheelbarrow load	About 4 to 6 cubic feet	Helps estimate trips from the pile to the work area.
Hand spreading lift	2 to 3 inches at a time	Prevents uneven settling and trapped soft pockets.
Stake spacing	6 to 10 feet apart	Gives enough grade points for small lawn repairs.
Drop distance	Under 100 feet when possible	Keeps labor reasonable for bulk delivery.
Finished grade near paving	About 1 inch below edge	Reduces washout onto walks and driveways.

Frequent mistakes and how to recover

Ordering by area only is a common error. A 500 square foot area at 1 inch deep is very different from the same area at 4 inches deep. If soil has already been delivered and the pile is short, finish the critical planting or drainage zones first, then feather the remaining area rather than spreading everything too thin.

Spreading over grass too deeply can bury crowns and kill turf. If more than about 1 inch has been placed over existing lawn and the blades are covered, rake the soil off the crowns while it is still loose. For deeper corrections, remove sod first, add soil underneath, then relay the sod.

Ignoring settlement leaves a shallow depression after rain. Fresh topsoil can settle noticeably, especially if it was dry and loose at delivery. For holes and trenches, fill in stages, moisten lightly, and tamp by foot or hand tamper around the edges. Leave a slight crown of about 1 inch over deeper fills, then recheck after two or three rains.

Creating drainage against buildings is more serious than a cosmetic grading error. Soil should not cover siding, weep holes, vents, or wood trim. If new soil directs water toward a foundation, pull it back and cut a shallow swale so runoff moves away from the structure. For drainage terms and calculator use, see the FAQ.

Special cases that change the calculation

Tree roots need caution. Do not add several inches of soil over the root zone of an established tree, especially inside the drip line. A thin topdressing may be tolerated, but deep fill can reduce oxygen at the roots. Around trees, use smaller corrections and keep soil away from the trunk flare.

Clay subsoil needs mixing at the boundary. If 4 to 6 inches of topsoil is placed directly on hard clay without loosening, water can perch above the clay and make the new layer stay wet. Scarify the clay surface 2 to 3 inches deep before adding topsoil so the layers knit together.

Slopes need erosion control the same day they are graded. On a slope steeper than about 1 foot of rise over 4 feet of run, use seed blanket, straw, sod, or another temporary cover after spreading. Fine topsoil can move in one heavy storm before grass roots hold it.

Raised beds and planters are not the same calculation as lawn grading. A contained bed may need a specific soil blend, and straight topsoil can compact in deep boxes. For bulk ground work, calculate cubic yards from measured length, width, and depth, then adjust only for access, settlement, and the need to avoid overfilling fixed edges.