How Much Topsoil Do I Need? (Tons, Yards + Calculator)

Most coverage charts skip the two numbers you actually need. They never say what depth they assume, and they never give you the weight.

This page gives you both. You get the formula, one worked example, and the weight in tons that a supplier quotes against. You also get a straight answer to a question nobody else covers: will a yard even fit in your truck?

The formula, and the shortcut that skips a step

You measure your project in square feet. But topsoil is priced and trucked by the cubic yard and the ton. One shortcut bridges the gap.

cubic yards = square feet × depth (inches) ÷ 324

That 324 is just 12 × 27 folded together. The 12 turns inches of depth into feet. The 27 turns cubic feet into cubic yards. The long way below gives the same answer.

cubic feet = square feet × depth (inches) ÷ 12
cubic yards = cubic feet ÷ 27

Once you have cubic yards, the weight falls out. Screened topsoil runs about 1.1 to 1.3 US tons per cubic yard, so use 1.2 tons as your working figure. Multiply cubic yards by 1.2 to get the tonnage to quote.

A worked example, start to finish

Say you are topping a 200 sq ft side yard with 4 inches of topsoil before seeding. Here is the volume and the weight.

cubic yards = 200 × 4 ÷ 324 = 2.47 cubic yards
tons        = 2.47 × 1.2    ≈ 3 tons

So you order about 2.5 cubic yards, or roughly 3 tons.

Bagged, the same job is 200 × 4 ÷ 12 = 66.7 cubic feet. At 0.75 cu ft per bag, that is 89 bags. Eighty-nine bags to haul and split open, versus one delivery. That gap is the whole bulk-vs-bagged story.

How far one cubic yard of topsoil spreads

Depth drives everything. The same cubic yard covers twice the ground at 2 inches as it does at 4. So lock in your depth before you size the order.

These are the exact coverage figures per cubic yard at each depth.

The mulch version of this math works the same way. The how much mulch do I need guide runs the identical ÷324 shortcut on bark and wood chips.

How deep should the topsoil be?

For a new lawn, the depth that matters is the prepared topsoil base the roots grow in. Not how deep you bury the seed.

Per Penn State Extension, "a minimum of 4 to 6 inches (firmed or settled depth) of a good-quality topsoil is needed to establish good-quality turf." That 4 to 6 inch base applies whether you seed or lay sod. Michigan State University Extension gives the same prepared-soil guidance before sod goes down.

Raised beds are different. There you fill the whole box, not a few inches, so the math becomes a straight volume. The how much soil for a raised bed guide covers that case. Topsoil is usually only part of a raised-bed blend, alongside compost.

Bulk vs bagged: where the crossover hits

Bagged topsoil sounds convenient until you count the bags. A cubic yard is 27 cubic feet. At the common 0.75 cu ft bag, that is 36 bags per yard. At 1.0 cubic feet, it is 27 bags. Either way, one yard is a pickup bed full of plastic.

One more bag warning. A 40 lb bag is not a fixed volume. Depending on moisture and material, it holds anywhere from 0.5 to 1.0 cubic feet. Two bags of the same stated weight can hold different amounts of soil. Buy by the cubic foot, not the pound, so your bag count matches your project.

Will a yard of topsoil fit in your pickup?

This is the question that catches first-time bulk buyers. By volume, a yard fits a half-ton pickup bed. By weight, it usually does not.

A cubic yard of topsoil weighs about 2,000 to 2,800 lb, depending on moisture. A yard of dry unscreened topsoil runs about 2,000 to 2,700 lb, per Dirt Connections.

A typical half-ton truck's safe payload is only about 1,000 to 1,500 lb, per Car and Driver F-150 specs. Add passengers and gear, and that drops fast. The yard outweighs the truck's limit.

Order topsoil by the ton

Do one thing before you call the supplier: get your tonnage, not a rounded guess.

Measure your square feet. Pick your depth in inches. Divide by 324 for cubic yards, then multiply by 1.2 for tons. That is the number a bulk yard quotes against, and the number that tells you how many truck trips you are in for. Run your exact dimensions through the Topsoil Calculator and it returns cubic yards, tons, and bags in one shot.