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

Most coverage charts skip the two numbers you actually need for a lawn or grading job. They never say what depth they assume, and they never give you the weight a supplier bills you for.

This page gives you both, plus the metric conversion suppliers rarely print. You get the formula, a worked example, the weight in tons and tonnes, and a straight answer to a question nobody else covers: will a yard even fit in your truck?

What "topsoil" means for a lawn job

Topsoil is the top layer of natural mineral soil, sold loose by the cubic yard or bagged by the cubic foot. For a lawn, it is not the finished product. It is the base layer that grass roots grow into.

That matters because a lawn job is not "spread soil and done." You are building a rootbed, then seeding or sodding on top of it. Get the depth wrong and the grass either never fills in or dies back the first dry summer, because the roots hit hardpan a couple inches down.

Grading and leveling jobs are different again. There, topsoil fills low spots or raises a slope so water sheds correctly. The depth you need changes by job, but the volume math below is the same for both.

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.

Working in metric, or ordering from a supplier who bills in tonnes? One US ton is 2,000 lb, which converts to about 0.907 metric tonnes. So 1.2 US tons per cubic yard is close to 1.09 metric tonnes per cubic yard (a cubic yard itself is about 0.765 cubic meters).

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 (about 2.7 metric tonnes).

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, matching the Topsoil Calculator's engine.

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. If you want the general math walked out for any soil type, see how much soil do I need.

Bag weight to cubic feet: the number bags don't print clearly

Search "40 lbs topsoil to cubic feet" and you'll find no single fixed answer, because a pound of topsoil is not a fixed volume. Density shifts with moisture and screening. This table gives the realistic range for the common bag weights.

How deep should the topsoil be for a lawn?

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, and University of Minnesota Extension recommends grading and adding topsoil as part of a proper lawn renovation, not just overseeding bare dirt.

Raised beds are a different problem entirely. There you fill a whole box, not a thin layer, so the math becomes a straight volume calculation and the mix is usually blended with compost. The how much soil for a raised bed guide covers that case in full, including the 60/30/10 blend most beds use. Filling an in-ground bed instead of a box? See how much garden soil do I need.

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.

Here is the same crossover expressed by project size, so you can decide before you call anyone.

One more bag warning worth repeating here. A 40 lb bag is not a fixed volume. Depending on moisture and material, it holds anywhere from 0.5 to 0.75 cubic feet in most cases. 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. For the full weight breakdown by condition, wet versus dry versus packed, see how much does a yard of topsoil weigh.

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, which is why "what does 2 yards of topsoil look like" is really a weight question in disguise: 2 yards is 4,000 to 5,600 lb, well beyond what most consumer trucks should haul in one trip.

Grading and leveling: a slightly different job

Leveling a low spot or fixing a drainage grade uses the same volume formula, but the depth is not a flat number across the whole area. A low spot might need 4 inches in the center and taper to nothing at the edges.

The practical fix: measure the deepest point, then treat the area as needing roughly half that depth on average if the low spot tapers evenly to grade. Order for the average depth, not the deepest point, or you will over-order.

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 (or about 1.09 for metric tonnes). 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, or jump straight to converting cubic yards to tons if that is the only number you need. Spreading a thin layer over an existing lawn instead of filling a low spot? How to top dress a lawn and the topdressing calculator are built for that thinner, lawn-scale job.