Topsoil Calculator (by Square Feet)
Enter your area in square feet and the desired depth to instantly calculate how much topsoil you need in cubic yards, along with the total weight, number of bags, and estimated cost.
Pricing info
There are multiple ways to calculate the topsoil your project needs. If you already know your length and width, use our main topsoil calculator — it handles that math directly. But if your area is measured in square feet, this tool is built exactly for that.
If you order too little topsoil means a second trip to the store. Ordering too much means wasted money and a pile of soil you have no idea what to do with. Neither is fun. This calculator takes the guesswork out of it — just enter your area in square feet and your desired depth, and you’ll get the exact amount you need.
How to Calculate Topsoil for a Square Foot Area
The math is simple than it you think. You need three numbers: your area (in square feet), your depth (in inches), and a basic formula.
The formula:
Cubic yards = (Area in sq ft × Depth in inches) ÷ 324
Why 324? Because there are 12 inches in a foot and 27 cubic feet in a cubic yard. Multiply those together and you get 324. That one number handles both conversions at once.
A quick example: You have a 500 sq ft garden and you want to lay 4 inches of topsoil.
500 × 4 = 2,000 ÷ 324 = 6.17 cubic yards
That’s it. Plug your numbers in and you’re done.
Most home improvement projects need between 2 and 6 inches of topsoil depth. A light top-dress for an existing lawn? Go with 2 inches. Starting a new garden bed from scratch? You’ll want at least 4 to 6 inches.
Topsoil Needed by Area
Not everyone wants to do math at 7am before a weekend project. Fair enough. Here’s a ready-made reference for the most common areas at the three most popular depths.
| Area (sq ft) | 2 inches deep | 4 inches deep | 6 inches deep |
|---|---|---|---|
| 100 sq ft | 0.62 cu yd | 1.23 cu yd | 1.85 cu yd |
| 200 sq ft | 1.23 cu yd | 2.47 cu yd | 3.70 cu yd |
| 300 sq ft | 1.85 cu yd | 3.70 cu yd | 5.56 cu yd |
| 400 sq ft | 2.47 cu yd | 4.94 cu yd | 7.41 cu yd |
| 500 sq ft | 3.09 cu yd | 6.17 cu yd | 9.26 cu yd |
| 600 sq ft | 3.70 cu yd | 7.41 cu yd | 11.11 cu yd |
| 700 sq ft | 4.32 cu yd | 8.64 cu yd | 12.96 cu yd |
| 800 sq ft | 4.94 cu yd | 9.88 cu yd | 14.81 cu yd |
| 900 sq ft | 5.56 cu yd | 11.11 cu yd | 16.67 cu yd |
| 1,000 sq ft | 6.17 cu yd | 12.35 cu yd | 18.52 cu yd |
| 1,200 sq ft | 7.41 cu yd | 14.81 cu yd | 22.22 cu yd |
| 1,500 sq ft | 9.26 cu yd | 18.52 cu yd | 27.78 cu yd |
| 2,000 sq ft | 12.35 cu yd | 24.69 cu yd | 37.04 cu yd |
| 5,000 sq ft | 30.86 cu yd | 61.73 cu yd | 92.59 cu yd |
Formula used: (sq ft × depth in inches) ÷ 324 = cubic yards. Weight calculated at 1.35 tons per cubic yard.
How Much Topsoil Do You Need for Common Areas?
100 Square Feet
This is roughly a 10×10 garden bed — a starter patch. At 4 inches deep you need about 1.23 cubic yards, which works out to around 1.66 tons. That’s roughly 66 bags if you’re buying 0.75 cu ft bags. Completely manageable for a solo afternoon project.
200 Square Feet
A 10×20 raised garden area. At 4 inches deep, expect to need 2.47 cubic yards — about 3.33 tons of soil. If you’re buying bags, that’s around 89. At this size, bulk delivery starts making financial sense.
300 Square Feet
Getting into proper garden territory now. Four inches of depth means 3.70 cubic yards and roughly 5 tons. Most suppliers will deliver a cubic yard for less than bags cost, so compare prices before you load up a cart.
400 Square Feet
A 20×20 area is where bulk delivery almost always wins. You’re looking at 4.94 cubic yards at 4 inches, weighing in at around 6.67 tons. That’s a lot of bags to haul.
500 Square Feet
The most common size for a backyard garden makeover. At 4 inches deep: 6.17 cubic yards, roughly 8.33 tons. Budget around $250–$400 for bulk topsoil depending on your region.
600 Square Feet
At 4 inches you need 7.41 cubic yards. That’s about 10 tons of topsoil — typically one full truckload from most local suppliers. Confirm the truck capacity before you order.
700 Square Feet
Need 8.64 cubic yards at 4 inches. If you’re doing a 2-inch top-dress on an established lawn, you can get away with just 4.32 cubic yards — a much lighter order and much easier on the budget.
800 Square Feet
At 4 inches: 9.88 cubic yards, around 13.3 tons. At 2 inches: 4.94 cubic yards. For a front yard re-seed or overhaul, 2 to 3 inches is usually plenty if your base soil is decent.
900 Square Feet
You’re crossing into the 11-cubic-yard range at 4 inches — 11.11 cu yd to be exact. At 6 inches you’d need 16.67 cubic yards. If you’re building new beds from scratch on poor soil, the extra depth is worth every cent.
1,000 Square Feet
A milestone. At 4 inches deep, a 1,000 sq ft area needs 12.35 cubic yards of topsoil, which weighs roughly 16.7 tons. This is firmly in delivery territory. Call your supplier, confirm delivery costs, and ask about the minimum order.
1,200 Square Feet
14.81 cubic yards at 4 inches. If you’re resodding a lawn this size, most landscapers recommend 3 to 4 inches of fresh topsoil before laying sod. At 3 inches you’d need about 11.1 cubic yards — a slightly more affordable middle ground.
1,500 Square Feet
A fairly large residential lawn project. Four inches deep means 18.52 cubic yards — just under 25 tons. If your project is closer to lawn renovation than new installation, 2 inches of topsoil (about 9.26 cubic yards) might be all you need.
2,000 Square Feet
Now we’re talking serious landscaping. At 4 inches you need 24.69 cubic yards and roughly 33 tons of topsoil. You’ll almost certainly need multiple deliveries or a large commercial truck. Get two or three supplier quotes — prices vary wildly at this volume.
5,000 Square Feet
Large-scale project territory. At just 2 inches deep, you’re already looking at 30.86 cubic yards. At 4 inches it’s 61.73 cubic yards — over 83 tons of soil. At this scale, it’s worth talking to a landscaping contractor. Bulk pricing, machinery, and experience all make a difference on a job this size.
Tips Before You Order
Add 10% for waste. Soil settles, spills happen, and uneven ground eats more than you expect. Always round up by at least 10%.
Know your depth before you call. Suppliers will ask. Lawn top-dressing = 1 to 2 inches. Garden beds = 4 to 6 inches. New lawn from scratch = 4 to 6 inches minimum.
Bags vs bulk. Bags are convenient for small jobs under 2 cubic yards. Beyond that, bulk is almost always cheaper. The break-even point is usually around 2 to 3 cubic yards.
Check what’s in it. “Topsoil” can mean anything from screened garden mix to recycled fill. Ask your supplier if it’s been screened and whether it contains compost. Your plants will thank you.
Daniel
Founder & Editor – TopSoilCalcOnline.com
Daniel is the founder and primary editor of TopSoilCalcOnline.com, a practical resource built to help homeowners, landscapers, and contractors accurately calculate topsoil, compost, and soil mix requirements. With hands-on experience in lawn preparation, raised beds, topdressing, and bulk soil planning, Daniel focuses on turning complex volume calculations into simple, reliable tools. Every calculator and guide on this site is designed to reduce material waste, prevent over-ordering, and help users plan landscaping projects with confidence and precision.