Ordering the right amount of topsoil is one of those small jobs that goes wrong in two annoying ways: you either buy too much and haul half a cubic yard back to the garage, or you buy too little and the delivery truck makes a second trip that costs almost as much as the soil itself. This topsoil calculator removes the guesswork by turning your bed dimensions and desired depth into cubic feet, cubic yards, and a dollar estimate — so the truck shows up once and you are done.
Topsoil is sold two ways in the United States: by the cubic yard in bulk (delivered by a dump truck), or by the bag at the garden center. The math is the same either way — volume equals area times depth — but the packaging changes how you round up. The calculator below handles both.
How to Use
- Measure the Bed or Lawn Area in square feet. For a rectangle, multiply length by width. For an irregular bed, break it into rectangles, calculate each one, and add them up. For a circle, use π × radius². Enter the total here.
- Set the Topsoil Depth. For top-dressing an existing lawn, ¼ to ½ inch is usually enough to smooth the surface without burying the grass. For a new raised bed or vegetable garden, 4 to 6 inches gives roots room to grow. For grading or leveling a low spot, measure how deep the fill needs to be.
- Type the Price Per Cubic Yard you were quoted. In most US markets, bulk screened topsoil runs $20–$60 per cubic yard, and delivery often adds another $30–$80 flat. If you do not know the price yet, the national average of about $30 is a reasonable default for budgeting.
- Optionally set the Bag Size and Price Per Bag if you are buying retail bags instead of bulk. A standard 1 cubic foot retail bag covers very little ground, so for any project over about 50 square feet, bulk is almost always cheaper. Leave Price Per Bag at 0 if you are buying by the cubic yard.
- Read the result card. The calculator shows your area, the cubic feet and cubic yards you need, the number of bags (if you entered a bag size), and the estimated total cost.
A good rule of thumb: round the cubic yardage up to the nearest quarter yard when ordering. Suppliers usually sell in quarter-yard increments, and a little extra is far cheaper than a second delivery trip.
The Topsoil Volume Formula
Topsoil is a bulk material, so the calculation is straightforward geometry:
Volume (cubic feet) = Area (sq ft) × Depth (feet)
Because depth is usually measured in inches, you divide by 12 to convert inches into feet. To get cubic yards — the unit suppliers quote — divide cubic feet by 27, because there are 27 cubic feet in one cubic yard (3 ft × 3 ft × 3 ft).
Worked example on a 200 sq ft bed at 4 inches deep:
- Cubic feet = 200 × (4 ÷ 12) = 200 × 0.333 = 66.7 cubic feet.
- Cubic yards = 66.7 ÷ 27 = 2.47 cubic yards.
- At $30 per cubic yard, the soil alone costs 2.47 × $30 = about $74, before delivery.
If you were buying 40-pound bags (roughly 0.75 cubic feet each) at $4 a bag, the same 66.7 cubic feet would need 89 bags and cost roughly $356 — nearly five times the bulk price. That gap is why contractors almost always order bulk for anything over a small flower bed.
How Deep Should Topsoil Be?
Depth is the number most people get wrong, because they picture a finished lawn or bed rather than the soil underneath.
- Top-dressing an existing lawn: ¼–½ inch. Any deeper and you smother the grass roots.
- Seeding or sodding a new lawn: 2–3 inches of good topsoil over the existing ground, raked level.
- Vegetable and flower beds: 6–8 inches, because root vegetables and perennials push deep.
- Raised beds: fill the box to the top, usually 12–18 inches.
- Grading low spots: measure the maximum depth you need to fill; the average depth is what this calculator uses.
When in doubt, order the thicker depth. Soil settles — expect 5–10% compaction over the first season as it rains and foot traffic compacts it.
Examples
Example 1 — A standard garden bed. A homeowner is preparing a new 200 sq ft vegetable plot and wants 4 inches of screened topsoil. The calculator returns 66.7 cubic feet, or 2.47 cubic yards. At the local $30 per cubic yard rate, the soil costs about $74, plus a typical $50 delivery fee. A 3-yard truck load is the smallest most suppliers will deliver, so they round up to 3 yards and pay $90 for soil — slightly more than the math says, but avoids a second trip.
Example 2 — Top-dressing a small lawn. A 1,000 sq ft lawn needs a ¼-inch top-dressing to level out low spots. Depth = 0.25 in. Volume = 1,000 × (0.25 ÷ 12) = 20.8 cubic feet, or 0.77 cubic yards. At $30 per cubic yard, that is about $23 of soil — usually too small to deliver, so the homeowner buys ten 2-cubic-foot bags at $4 each, for roughly $40 total.
Example 3 — A large raised bed project. A landscaper is filling twelve 4 ft × 8 ft raised boxes, each 12 inches deep. Total area = 12 × 32 = 384 sq ft. Depth = 12 in = 1 ft. Volume = 384 cubic feet = 14.22 cubic yards. At $35 per cubic yard, the soil cost is about $498, plus a two-ton delivery truck fee of roughly $80. Bulk ordering saves more than 75% compared with bagged retail.
FAQ
How much topsoil do I need for 1,000 square feet?
At a 4-inch depth, 1,000 sq ft requires about 333 cubic feet, or 12.3 cubic yards of topsoil. At a 2-inch lawn-top-dressing depth, the same area needs only 167 cubic feet, or about 6.2 cubic yards. Always check the depth your project actually requires before ordering.
How many cubic yards are in a dump truck load?
A standard full-size dump truck carries 10–14 cubic yards of topsoil, but most suppliers deliver smaller loads with pickup trucks or trailers starting at 1–3 cubic yards. Delivery fees are usually flat, so it is often cheaper to bundle topsoil with mulch or gravel from the same supplier and make one trip.
How much does a yard of topsoil cost?
Bulk screened topsoil typically costs $20–$60 per cubic yard depending on your region and the quality of the soil. Delivery adds another $30–$100 flat. Unscreened fill dirt is much cheaper, around $5–$15 per yard, but it is not suitable for planting because it contains rocks, clay, and weed seeds.
Should I buy topsoil by the bag or in bulk?
Buy in bulk for any project larger than about 50 square feet. Bulk topsoil usually costs $20–$60 per cubic yard, while retail bags work out to the equivalent of $100–$200 per cubic yard once you add up 40-pound bags. Bagged topsoil only makes sense for small beds, balcony planters, or when a delivery truck cannot reach your property.
How much does a cubic yard of topsoil weigh?
Topsoil weighs roughly 2,000–2,700 pounds per cubic yard when dry, and can exceed 3,000 pounds when wet. A standard pickup truck with a half-ton rating can safely carry only about half a cubic yard, which is why larger orders are delivered by dump truck rather than hauled yourself.
Is topsoil the same as fill dirt or garden soil?
No. Fill dirt is subsoil used for grading and leveling — it has almost no organic matter and will not support plants. Topsoil is the upper, organic-rich layer where plants actually root. Bagged "garden soil" or "potting mix" is blended with compost, peat, or perennials and is meant for containers or raised beds, not for spreading over a whole lawn.
Disclaimer
This topsoil calculator is provided for informational purposes only and does not constitute landscaping, engineering, or agronomic advice. Estimates are based on the area and depth you enter; actual coverage depends on soil density, compaction, moisture content, and how level your ground already is. Prices vary by region, supplier, and time of year. Always confirm the delivered yardage and final price directly with your landscape-supply company, and round up by at least 10% to avoid running short.