How Much Does a Yard of Topsoil Cover?

A single cubic yard of topsoil covers 108 square feet at a 3-inch depth, 162 square feet at 2 inches, or 81 square feet at 4 inches. The exact area depends entirely on how deep you spread it, so the first step is always deciding your target depth.

Formula

The volume of topsoil needed is length × width × depth, all in consistent units. The standard formula used by landscapers and soil suppliers is:

Volume (yd³) = (Length (ft) × Width (ft) × Depth (in)) ÷ 324

Where:

• Length – the longer side of the area, in feet
• Width – the shorter side, in feet
• Depth – how thick the soil layer will be, in inches
• 324 – the conversion factor: 1 cubic yard = 27 cubic feet, and 1 foot = 12 inches, so 27 × 12 = 324

For a cubic feet result, use the same inputs but divide by 12 instead: Length × Width × Depth ÷ 12.

Worked Example

Using the default values from the calculator: a lawn 40 ft long, 25 ft wide, with a 3-inch topsoil layer.

1. Multiply length by width: 40 × 25 = 1,000 ft²
2. Multiply by depth in inches: 1,000 × 3 = 3,000
3. Divide by 324: 3,000 ÷ 324 = 9.26 yd³

The calculator shows 9.26 cubic yards (rounded to two decimals), which equals 250 cubic feet. That is the amount you would order.

Why Depth Matters More Than Area

Topsoil is sold by volume, not by weight or bag count. A cubic yard is 3 feet long, 3 feet wide, and 3 feet high – 27 cubic feet. Spread that over a large area, it disappears; pile it deep, it covers far less. The table below shows common depths and their coverage per yard:

• 1 inch deep → 324 ft² (about an 18×18 ft area)
• 2 inches deep → 162 ft² (about 13.5×12 ft)
• 3 inches deep → 108 ft² (about 10.8×10 ft)
• 4 inches deep → 81 ft² (about 9×9 ft)
• 6 inches deep → 54 ft² (about 7.7×7 ft)

Most residential projects fall between 2 and 4 inches. A new lawn from seed usually needs 4–6 inches of good topsoil, while topdressing an existing lawn only needs 1–2 inches. If you are unsure, measure the area and multiply by the depth you plan to use – that gives the exact volume.

How to Measure Your Area Correctly

Break irregular lawns into rectangles, triangles, or circles, then add the volumes together. For a rectangle, multiply length by width. For a triangle, multiply base by height and divide by 2. For a circle, multiply π (3.1416) by the radius squared. Always measure in feet; if you measure in inches, convert to feet first (divide by 12).

If your lawn has flower beds, a patio, or a driveway, subtract those areas. A common mistake is ordering for the entire property line instead of just the grass area. Walk the perimeter with a tape measure or use a measuring wheel for large spaces. For oddly shaped areas, divide them into smaller rectangles and add them up – it is more accurate than guessing.

Common Mistakes and How to Avoid Them

• Mixing units: Always use feet for length and width, and inches for depth. If you enter depth in feet, the formula changes – 1 foot of depth on 1,000 ft² needs 37 yd³, not 3.08 yd³.
• Forgetting to subtract existing soil: If you are filling a low spot, measure the depth of the depression, not the total depth you want after filling.
• Rounding up too little: Soil settles after watering and rain. Order 10–15% extra to account for compaction, especially for new lawns.
• Assuming bag size: Bags vary from 0.5 to 1.5 cubic feet. Check the label – a 1.5 ft³ bag covers 4.5 ft² at 4 inches deep, so you would need 18 bags per cubic yard.

If you are ordering bulk topsoil, most suppliers deliver in cubic yards. A typical dump truck holds 10–14 yards, but that varies – ask your supplier. For small projects, bags are easier to handle but far more expensive per yard.

How to Choose the Right Topsoil

Not all topsoil is the same. Screened topsoil has been sifted to remove rocks, roots, and clumps – it is best for lawns. Unscreened soil may contain debris and is cheaper but more work. For vegetable gardens, look for soil with compost added; for lawns, a sandy loam drains well and supports grass roots.

Ask your supplier for a soil test report or ask what the soil is blended with. Some “topsoil� is actually subsoil with added compost – it may be fine for filling holes but poor for growing grass. If you are unsure, buy a small amount, check the texture, and see how it drains. Good topsoil should crumble easily, hold moisture, and not be full of clay or sand.

Costs and Ordering Tips

Bulk topsoil is sold by the cubic yard. Prices vary widely by region, quality, and delivery distance, so it is not possible to give a fixed number. As a general rule, bulk is much cheaper per yard than bagged soil. Many suppliers require a minimum order (often 1–3 yards) and charge a delivery fee. Some offer free delivery over a certain quantity.

When ordering, tell the supplier the exact cubic yards you need, not the square footage. If you are filling a raised bed that is 8 ft × 4 ft × 1 ft deep, that is 32 cubic feet, or about 1.2 cubic yards – order 1.25 or 1.5 to be safe. Always confirm the delivery area and whether the driver can dump the soil where you need it.

Alternatives to Bulk Topsoil

If you only need a small amount, bagged topsoil from a garden center is convenient. Bags are typically 0.75 to 1.5 cubic feet. For a 10×10 ft area at 3 inches deep, you need 100 ft² × 0.25 ft = 25 ft³, which is about 17 bags of 1.5 ft³ each – heavy but doable.

For improving existing soil, consider compost or a soil conditioner instead of topsoil. Compost adds organic matter but does not raise the grade much. For filling large holes or leveling a yard, you might use fill dirt (cheaper but poor for growing) and then add a few inches of topsoil on top. Always check local regulations – some areas restrict soil import to prevent pests or weeds.

Frequently Asked Questions

How many bags of topsoil are in a cubic yard?

It depends on bag size. A 1-cubic-foot bag: 27 bags per yard. A 1.5-cubic-foot bag: 18 bags. A 2-cubic-foot bag: 13.5 bags (round up to 14). Check the bag label – most list cubic feet, not pounds, because weight varies with moisture.

How deep should topsoil be for a new lawn?

For seeding, 4–6 inches of good topsoil is ideal. For sod, 3–4 inches is usually enough because the sod comes with its own root layer. If you are just topdressing an existing lawn, 1–2 inches is plenty – more can smother the grass.

Does topsoil settle after spreading?

Yes, especially if it contains compost or is loose. Freshly spread soil can settle 10–20% after watering and rain. That is why it is wise to order 10–15% extra, or spread it slightly higher than the desired level and let it settle.

Can I use topsoil for raised garden beds?

Yes, but mix it with compost or a raised bed mix. Pure topsoil can compact in a raised bed, so a 50/50 blend with compost works better for vegetables. For flowers, topsoil alone is fine.

How much does a cubic yard of topsoil weigh?

Dry topsoil weighs about 1,000–1,200 pounds per cubic yard. Wet topsoil can weigh 1,500–2,000 pounds. That is why delivery is recommended – a cubic yard is too heavy for most pickup trucks.

What if my area is not a perfect rectangle?

Break it into smaller rectangles, triangles, or circles, calculate each volume, and add them together. For a curved border, approximate with a rectangle that covers the widest and longest points – you will order a little extra, which is fine.

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in l | Lawn length | ft | 40 | 0 | 100000
in w | Lawn width | ft | 25 | 0 | 100000
in d | Depth | in | 3 | 0 | 120
out yd | Volume | yd³ | l * w * d / 324 | 2
out ft3 | Volume | ft³ | l * w * d / 12 | 1