Topsoil Calculator
Calculate how much topsoil you need from the area and depth you want to add, in cubic yards, cubic feet or cubic meters. Already have a volume? Find how much ground it will cover at your chosen depth.
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How Do I Calculate How Much Topsoil I Need?
Measure the ground area and the thickness of the new soil layer. Multiply those measurements in compatible units. For a rectangular space measured in feet with depth in inches:
Cubic feet = length (ft) × width (ft) × added depth (in) ÷ 12
Cubic yards = length (ft) × width (ft) × added depth (in) ÷ 324
A 20 × 10 ft area receiving 3 in of soil needs 50 ft³ = 1.8519 yd³ before any extra allowance. “Yards” on a soil quote normally means cubic yards of volume, not square yards of ground. One cubic yard contains 27 cubic feet.
Circles and more than one area
For a circular bed, use area = π × (diameter ÷ 2)², then multiply by the added depth. A 10 ft diameter circle at 3 in needs about 19.6350 ft³ = 0.7272 yd³. For an irregular site, add non-overlapping sections; each section can have its own depth. The tool totals their unrounded volumes before applying allowance or counting bags.
How Much Topsoil Do I Need for 1,000 Square Feet?
Square footage alone does not tell you the amount to order. For 1,000 ft², every inch of added soil requires 83.3333 ft³, or 3.0864 yd³. Doubling the depth doubles the volume.
| Added depth | Yards for 1,000 ft² | Area covered by 1 yd³ |
|---|---|---|
| ¼ in | 0.7716 yd³ | 1,296 ft² |
| ½ in | 1.5432 yd³ | 648 ft² |
| 1 in | 3.0864 yd³ | 324 ft² |
| 2 in | 6.1728 yd³ | 162 ft² |
| 4 in | 12.3457 yd³ | 81 ft² |
| 6 in | 18.5185 yd³ | 54 ft² |
The depths show how the math changes. They are not recommended application rates for an existing lawn, new lawn or planting bed.
How much ground will my soil cover?
Use the topsoil coverage calculator option when you already know your available volume. Select Area covered by a known volume, enter that volume and the spreading depth.
Coverage (ft²) = volume (yd³) × 324 ÷ depth (in)
For example, 2 yd³ spread 2 in deep covers 324 ft². This assumes a uniform layer; deeper low spots will use more of the available soil.
Measure Only the Soil You Need to Add
The depth field is the gap between the existing soil surface and the intended finished level. If a bed already contains soil, do not enter its full wall height as new fill. For example, a 12 in inside height with 8 in of retained soil leaves 4 in to fill, if filling to that level is your plan.
For grass, distinguish a new soil layer from a thin application over existing turf. The calculator does not choose a suitable lawn depth. Match the material and depth to the lawn's condition and your planting plan; soil testing helps assess whether an amendment is needed.
Low spots need area-weighted depths
If 100 ft² needs 1 in and another 50 ft² needs 4 in, the total is 25 ft³. Enter two areas instead of applying the deeper measurement everywhere. Do not simply average depths from differently sized areas: here the equivalent depth over all 150 ft² is 2 in, not 2.5 in.
For continuously uneven ground, measure enough points to estimate representative zones. A single depth cannot model a grading survey. Any extra allowance is a visible addition to the measured volume; it is not proof of how much a particular soil will settle.
Topsoil volume does not choose the material
Topsoil is the surface soil layer; screening describes processing, not a guarantee of quality. The correct quantity does not make every product suitable for planting or structural fill. Check the supplied soil's properties and intended use. For raised beds, the University of Maryland guidance distinguishes existing-soil conditions and growing-media choices.
Buying Topsoil by the Yard, Ton or Bag
A cubic yard measures volume. A ton measures weight. To estimate topsoil in tons, use the supplier's weight per volume for the soil and condition you will receive. There is no fixed ton-per-yard value that fits every screened, unscreened, dry or wet product.
Weight (lb) = volume (yd³) × supplier density (lb/yd³)
US short tons = weight (lb) ÷ 2,000
For arithmetic only, 2 yd³ at a hypothetical 2,200 lb/yd³ equals 4,400 lb = 2.2 US short tons. That density is not a default or a recommendation. The tool also distinguishes metric tonnes: one tonne is 1,000 kg.
Why moisture and soil condition matter
Water contributes to the delivered weight. Loose and compacted soil also contain different amounts of pore space, so the same volume can hold different amounts of soil. A dry laboratory density excludes the water in a wet delivery and may not represent the weight of the product you are ordering.
Count bags from volume, not the weight label
Use the volume printed on your selected bag. A 40 lb bag does not have one universal cubic-foot capacity. For a 1 yd³ requirement, a hypothetical 2 ft³ bag needs 14 bags: 27 ÷ 2 = 13.5, rounded up. Those bags contain 28 ft³, leaving 1 ft³ beyond the requirement.
When you add multiple areas, bag rounding happens once after their volumes and any selected allowance are combined. The result shows the bag-rounding surplus separately. Estimated order weight refers to the volume with allowance, before any surplus caused by whole bags.
Sources & Methodology
Area and added depth determine each section's volume in ft³. The calculator sums sections, applies only the entered allowance, then rounds the total bag count up once. Coverage mode divides a known volume by depth with no allowance. Weight requires user-entered density matching the soil's condition.
1 ft = 0.3048 m; 1 yd³ = 27 ft³; 1 m³ = 1,000 L; 1 lb = 0.45359237 kg. No default density, bag volume, application depth or settlement factor is used. Method reviewed October 23, 2026.
