Cubic Yard of Dirt: Coverage, Weight, Calculations, and Ordering

Overview

One cubic yard of dirt is a volume of soil measuring 3 feet long, 3 feet wide, and 3 feet deep, which equals 27 cubic feet, according to CalculatorSoup’s cubic yards calculator. Spread at 3 inches deep, that volume covers about 108 square feet. How far it actually goes on a project depends on the depth you apply it and how much the material settles or compacts after placement.

The simplest way to picture a cubic yard is a cube where every side measures 3 feet, a visualization used by Lilly’s Landscape Supply. That source also notes the metric equivalent: 1 cubic yard equals 0.7646 cubic meters. It is a large amount of material for hand work, but a small amount relative to what a delivery truck can carry.

Two points matter before ordering. First, a cubic yard measures volume, not weight. The same yard of dirt can weigh anywhere from roughly 2,000 to more than 3,000 pounds depending on soil type and moisture, per Lilly’s Landscape Supply, so yards and tons are not interchangeable. Second, dirt changes volume between its loose delivered state and its final placed state, which affects how much you should order for fill and grading work. The sections below walk through coverage, calculation, weight, overage, material choice, and the practical decision between bags, bulk delivery, and self-hauling.

Cubic Yard Coverage by Depth

Coverage is a direct function of depth: one cubic yard covers 324 square feet at 1 inch deep, and the coverage shrinks proportionally as depth increases. The governing formula, published by CalculatorSoup, is coverage in square feet = 324 ÷ depth in inches.

The table below applies that formula across common application depths so you can look up your project without recalculating. Values above 6 inches are derived from the same 324 ÷ depth formula.

Depth (inches)	Coverage per cubic yard (square feet)
1	324
2	162
3	108
4	81
5	~65
6	54
7	~46
8	~40.5
9	36
10	~32
11	~29.5
12	27

The 1-inch through 6-inch figures match the coverage examples published by Lilly’s Landscape Supply: approximately 324 square feet at 1 inch, 162 at 2 inches, 108 at 3 inches, and 54 at 6 inches.

One point of confusion is worth resolving directly. Some purchasing guides state that a yard covers about 100 square feet at 3 inches, while calculators state 108 square feet. Both are describing the same yard. The 108-square-foot figure is the exact geometric result of 324 ÷ 3. The 100-square-foot figure is rounded planning guidance that builds in a small cushion for uneven spreading and settling. Use 108 when checking a calculation, and treat 100 as a conservative shorthand when sketching an order. Neither number changes the physical volume; only the assumed spreading efficiency differs.

How to Calculate Cubic Yards of Dirt

There are two supported ways to convert project measurements into an order quantity, and both produce the same answer. The first uses length, width, and depth all measured in feet. The second uses square footage plus a depth in inches, which is more natural when you already know the area or when the depth is only a few inches.

Both methods need the same three inputs: the length and width of the area (or its total square footage) and the intended depth of the dirt. The subsections below work the same example project through each method, a 12-foot by 15-foot low spot filled 3 inches deep, so you can confirm that the formulas agree before trusting either one with your own numbers.

Using Length, Width, and Depth in Feet

When all three dimensions are in feet, multiply them together to get cubic feet, then divide by 27 to get cubic yards. CalculatorSoup states the method plainly: measure length, width, and depth in feet, multiply them, and divide by 27. The Spruce describes the same sequence, square footage times depth equals cubic feet, then divide by 27.

The one trap is depth. A 3-inch depth must be converted to feet first: 3 ÷ 12 = 0.25 feet. Working the example: 12 ft × 15 ft × 0.25 ft = 45 cubic feet. Then 45 ÷ 27 = 1.67 cubic yards. Most suppliers sell in half-yard or full-yard increments, so this project would round to a 2-yard order before any settling allowance is considered.

Using Square Feet and Depth in Inches

When you know the area in square feet and the depth in inches, skip the unit conversion entirely with the formula from CalculatorSoup: cubic yards = (square feet × depth in inches) ÷ 324. The 324 constant is simply 27 cubic feet per yard times 12 inches per foot, so the formula is mathematically identical to the feet-based method.

RCW Nurseries publishes the same calculation: area in square feet multiplied by depth in inches, divided by 324, equals total yards.

Working the same example: the area is 12 × 15 = 180 square feet. Then 180 × 3 = 540, and 540 ÷ 324 = 1.67 cubic yards. That matches the feet-based result exactly, which is the check worth doing on any real project. If the two methods disagree, the mistake is almost always a depth entered in the wrong unit. This version of the formula is usually the safer choice for shallow applications because the depth stays in inches, the unit most people naturally measure in.

Avoid Common Measurement Errors

Most bad dirt orders trace back to measurement and unit mistakes rather than bad formulas. The formulas above are exact; the inputs are where projects go wrong.

Before finalizing a quantity, run through this checklist:

• Keep inches and feet separate. Entering “3” for a 3-inch depth in the feet-based formula produces a result 12 times too large. Convert inches to feet (divide by 12) or use the 324 formula, which expects inches.
• Use an average depth when depth varies. For a low area that is 4 inches deep at the center and tapers to nothing at the edges, take several depth readings across the area and average them rather than using the deepest point, which overstates the order, or the shallowest, which understates it.
• Divide irregular areas into simple shapes. Split an L-shaped or curved bed into rectangles you can actually measure, calculate each section’s volume separately, and add the results.
• Round only at the end. Carry the decimal through each section’s calculation and round the combined total up to the supplier’s ordering increment. Rounding each piece separately compounds the error.
• Treat slopes conservatively. A sloped or uneven site cannot be measured to survey precision with a tape measure. Take more depth readings, accept that the result is an estimate, and let the ordering allowance absorb the uncertainty rather than pretending the geometry is exact.

None of these steps require special tools. A tape measure, a few extra depth readings, and consistent units will keep the calculated volume within the tolerance that a normal ordering allowance can cover.

How Much Does a Cubic Yard of Dirt Weigh?

There is no single answer, because a cubic yard measures volume while weight depends on what fills that volume. As a bounded reference range, Lilly’s Landscape Supply puts dry, loose dirt at approximately 2,000 to 2,600 pounds per cubic yard (1 to 1.3 tons) and notes that moist dirt can weigh upwards of 3,000 pounds or more. For fill dirt specifically, Ottr Supply estimates roughly 2,000 pounds, about 1 ton, per cubic yard.

Three variables drive the spread. The first is composition. Lilly’s Landscape Supply notes that whether a soil is sandy, silty, or clay significantly affects its weight per yard. The second is moisture: water is heavy, and a yard of soil after rain weighs meaningfully more than the same yard dry, which is why the moist estimate above exceeds the dry range by several hundred pounds. The third is the material’s state. Ottr Supply notes that the more compacted the soil, the more it weighs per cubic yard, while loose fill dirt is lighter and fluffier.

That third variable is easy to underestimate. The Federal Highway Administration’s earthwork design guidance lists topsoil at 2,430 pounds per cubic yard in its natural in-situ state but only 1,620 pounds per cubic yard loose. Same material, same one-yard box, roughly a third less weight once the soil is dug up and fluffed. A delivered loose yard therefore weighs less than a yard of the same soil measured in the ground or after compaction.

The practical takeaway: never treat “a yard” and “a ton” as interchangeable, and never use a generic figure for a decision where weight actually matters, such as loading a vehicle or checking a driveway’s capacity. For those decisions, ask the supplier for the estimated weight of your specific material in its delivered condition. Ask whether that figure is measured or estimated, and do not rely on it for vehicle loading unless the load is clearly within your vehicle’s rating even after allowing for that uncertainty.

How Much Extra Dirt Should You Order?

Whether you need extra depends on what happens to the dirt after placement, so overage is a project-condition decision rather than a fixed percentage. Published guidance genuinely conflicts: Bama Dirt’s material calculator suggests adding 5 to 10 percent depending on the job because material settles and compacts, while RCW Nurseries recommends multiplying the calculated yards by 1.25, a 25 percent allowance, to account for settling. RCW is candid about why: these are guidelines, not rules, because soil settles unpredictably.

The right allowance depends on two things: the state in which the volume was calculated, and whether the dirt will merely settle on its own or be mechanically compacted to a specification. The two subsections below cover each in turn, because applying a percentage to the wrong volume basis produces the wrong order no matter how careful the arithmetic was.

Loose, Bank, and Compacted Cubic Yards

The same soil occupies three different volumes depending on its state, and earthwork practice names each one. The FHWA earthwork representation guide defines a bank cubic yard (BCY) as one cubic yard of material as it lies in its natural, undisturbed state, and a compacted cubic yard (CCY) as one cubic yard after the material has been compacted to specification density. Loose cubic yards describe the fluffed-up state after excavation, which is the state in which a supplier’s truck delivers.

Soil expands when excavated and shrinks when compacted. FHWA’s earthwork design guidance shows how large the swings can be: topsoil listed at 2,430 pounds per cubic yard in situ drops to 1,620 pounds per cubic yard loose, a swell of 56 percent by volume. The FHWA representation guide also gives one bounded conversion example: a common estimated shrink/swell factor for unclassified borrow is 0.9, meaning a bank cubic yard yields roughly 0.9 compacted cubic yards. That figure applies to bank-to-compacted conversion for that material category. It is not a conversion from supplier-delivered loose yards to compacted yards, and it should not be reused as one.

For a buyer, the operational point is simple: your geometric calculation describes the final placed volume, but the supplier delivers loose yards. If the dirt will be compacted, the delivered loose volume must exceed the calculated placed volume, and the correct factor depends on the specific material. Ask the supplier how many loose yards they recommend for your compacted target; they know their product’s typical shrink better than any generic table.

Settling Versus Mechanical Compaction

Ordinary settling and specified mechanical compaction are different phenomena and should not share one blanket overage percentage. Settling is the gradual, modest consolidation of loosely placed soil under its own weight and rainfall. For garden beds, lawn topdressing, and similar uses, a modest planning allowance in the range published by Bama Dirt (5 to 10 percent depending on the job) or the more conservative 25 percent factor from RCW Nurseries covers it, though these published percentages are general guidelines that do not establish which allowance applies at a particular depth, so confirm the allowance for your actual material and project conditions.

Mechanical compaction to a specified density is a different scale of volume change, and it varies enormously by soil type. The Wisconsin DOT’s weight-volume research report documents expansion factors from bank to loose state ranging from 4 to 8 percent for clean sands, 16 to 23 percent for sands with gravel, 27 percent for silts, and 26 to 58 percent for clays. A clay that fluffs up 58 percent when excavated loses a correspondingly large share of its loose volume when compacted back down; a clean sand barely changes. This is why the FHWA representation guide directs designers to use the shrink/swell factor recommended in the project’s geotechnical report rather than a default. For a small project with a compaction requirement, the equivalent move is asking the supplier or contractor for the factor appropriate to the actual material being placed.

Choosing Fill Dirt, Topsoil, or Screened Soil

Ordering the right quantity of the wrong material still produces a failed project, so material choice matters as much as the math. The core distinction is function. Ottr Supply describes fill dirt as a compactable material used to build up ground elevation, fill low spots, and provide a stable base, typically low in organic matter, which helps prevent settling over time. The Spruce describes topsoil as the top layer of earth where plants thrive, the key ingredient for gardens and lawns, and notes that buyers typically choose among products such as black dirt, loam, or screened loam.

The matrix below turns those distinctions into a purchasing decision:

Material	Best suited for	Not suited for	Ask the supplier
Fill dirt	Raising grade, filling deep low spots, stable base layers (Ottr Supply)	Planting; it has no nutrients and packs too hard for roots (GoCalc)	Is it low in organic matter and free of debris? How does it compact?
Topsoil	Lawns, gardens, planting beds, the finish layer over fill (The Spruce)	Deep structural fill, where its organic content invites settling	What is the source, and is it screened?
Screened soil products	Applications needing consistent texture without rocks or clumps	Any use where the underlying specification is unknown	What exactly was screened out, and what is the soil blend?

One combination deserves emphasis because it prevents the most common mistake. GoCalc’s fill dirt calculator states that fill dirt is subsoil with no nutrients that packs too hard for roots, and recommends using fill for volume while leaving at least 4 to 6 inches of quality topsoil on top for a green lawn. Layering this way lets the cheap, stable material do the structural work and the biologically active material support the plants.

A caution on “screened” products: screening describes processing, not a recipe. A screened material has been passed through a mesh to remove oversized rocks and debris, but the underlying soil could be anything from rich loam to lean subsoil. Always confirm the actual product specification with the supplier rather than treating the word screened as a quality grade.

Bags, Delivery, and Hauling

With the quantity calculated and the material chosen, the last decision is how the dirt gets to the project: bagged soil from a store, bulk delivery from a supplier, or self-hauling in a pickup or trailer. Each option fits a different order size. Bags make sense for fractions of a yard, delivery makes sense for multi-yard orders or when no capable vehicle is available, and self-hauling sits in between, limited less by volume than by weight.

The three subsections below cover the numbers behind each option: how many bags replace a bulk yard, how to compare complete delivered quotes rather than advertised per-yard prices, and how to determine whether a specific pickup can actually carry a yard safely.

How Many Bags Equal One Cubic Yard?

It takes about 27 standard 1-cubic-foot bags to equal one cubic yard, according to Soilutions, which notes that one cubic yard is equivalent to roughly 27 of the standard-sized soil bags found at a nursery or home improvement store.

The general formula, from CalculatorSoup, is bags per cubic yard = 27 ÷ bag size in cubic feet. RCW Nurseries publishes the multi-yard version: yards × 27, divided by the cubic feet per bag. So a 1.5-cubic-foot bag yields 27 ÷ 1.5 = 18 bags per yard, and a 2-cubic-foot bag yields 27 ÷ 2 = 13.5 bags per yard.

Use the bag’s labeled cubic-foot volume for this conversion, never its weight. Bag weight varies with moisture and material density, the same variables that make a cubic yard of dirt weigh anywhere from 1 ton to over 1.5 tons, so a 40-pound label tells you nothing reliable about how much volume the bag contains.

How to Evaluate Delivered Cost

The advertised price per yard is only part of the real cost, so compare complete delivered quotes rather than material prices. As a bounded reference, The Spruce reports fill dirt at $5 to $15 per cubic yard, topsoil at $10 to $55, and sand at $15 to $40, with typical dirt purchases running $12 to $55 per cubic yard and delivery adding up to around $100 or more depending on soil quality and distance. Actual pricing is local; Ottr Supply, a Boston-area supplier, lists fill dirt at a regular price of $45.00 per cubic yard, which sits above The Spruce’s national fill-dirt range and illustrates why no published range substitutes for a local quote.

When requesting a quote, ask the supplier to itemize:

• The material price per yard and the exact product specification
• The delivery fee and how it changes with distance
• Any minimum-order quantity or small-load surcharge
• Whether site access (narrow driveway, soft ground, overhead lines) affects where the truck can dump or what it costs
• Whether the quoted quantity is loose delivered yards

No corpus source establishes universal figures for minimum-load, distance, or access charges, so treat any number you have not confirmed locally as unverified. An itemized quote converts an advertised per-yard price into the only figure that matters: the total cost of the material actually on your site.

Can a Pickup Carry One Cubic Yard Safely?

By volume, usually yes; by weight, only the specific truck’s ratings can answer. Soilutions notes that one cubic yard will generally fill the back of a standard-sized pickup truck bed, and Lilly’s Landscape Supply says a standard truck bed of about 8 feet can hold approximately 1 to 2 cubic yards of dirt. Both statements answer whether the material fits, not whether the vehicle can safely carry its mass.

The mass is the problem. Per the weight section above, a loose dry yard runs roughly 2,000 to 2,600 pounds and a moist yard can exceed 3,000 pounds (Lilly’s Landscape Supply). Many light-duty pickups have payload capacities below the upper end of that range once passengers and gear are counted, so a bed that visually swallows a yard of dirt can still be well over its rated load.

The safe workflow has three steps. First, get the supplier’s estimated weight for the specific material in its delivered condition, since composition and moisture change the figure by hundreds of pounds. Second, check your particular vehicle’s payload and gross vehicle weight ratings from the door-jamb placard or owner’s documentation, not from bed dimensions or general truck-class assumptions. Third, if the estimated load weight is not clearly within the rating, choose delivery or split the haul into multiple smaller trips. A delivery fee is cheap compared with damaged suspension, unsafe braking, or an overloaded-vehicle citation.