Dirt Calculator
Estimate topsoil, dirt, compost, or fill material volume in cubic yards, cubic feet, and bags. Enter your area dimensions and desired depth to quickly calculate how much material you need for gardens, lawns, raised beds, and landscaping projects.
Enter your area dimensions
Use this calculator to estimate the amount of dirt or topsoil needed for rectangular, square, or circular areas. You can also estimate how many standard bags you may need based on your selected bag size.
Rectangular area = length × width
Circular area = π × radius²
Cubic feet = area × depth in feet
Cubic yards = cubic feet ÷ 27
Bags needed = cubic feet ÷ selected bag size
Free Dirt Calculator Guide: Estimating Volume in Cubic Yards, Feet, and Bags for Grading, Filling, and Landscaping
Ordering bulk dirt is one of those jobs that looks simple right up until the truck shows up. Order too little and the work stops while you wait for a second load and pay a second delivery fee. Order too much and you are left with a small mountain of soil in the driveway that has to be moved, spread, or hauled away. The Dirt Calculator exists to take the guesswork out of that first order. It turns the length, width, and depth of your project into a real number of cubic yards, cubic feet, or bags, so the amount that arrives matches the amount the job actually needs.
This guide walks through everything that sits behind that number. You will see how the volume math works, why fill dirt and topsoil are not interchangeable, how much a load weighs before you try to move it, and how much extra to order so the ground still sits at the right height after it settles. Along the way there are links to deeper reads on our topsoil blog whenever a single question deserves a full article of its own.
Good property planning is data first, shovel second. For the full library of household and project tools, visit our home calculators category on waldev.com. Whether you are surfacing a new drive with the Free Asphalt Calculator, clearing a work path and pricing it with the Tree Removal Cost Calculator, or working out patio volume with the Cubic Yard Calculator, the goal is the same: know the numbers before you spend the money.
Fill Dirt vs. Topsoil: Choosing the Right Material for Your Project
The first fork in the road on any dirt project is deciding what kind of dirt you actually need, because the word covers two materials that behave very differently. Fill dirt is the subsoil that sits below the dark upper layer of the ground. It has had most of the organic matter stripped out of it, which is exactly what you want when the job is about holding a shape. Because there is little in it left to rot, compacted fill dirt stays put. That makes it the right choice for raising a low spot, backfilling around a foundation, or building a stable pad under something heavy.
Topsoil is the opposite. It is the living top few inches of the ground, full of organic matter, microbes, and the nutrients plants feed on. It is fantastic for growing things and a poor choice for structural fill, because all that organic material breaks down over time and the surface slowly sinks. If you have ever wondered exactly what topsoil actually is or what topsoil is made of, those guides break down the layers in plain language, and the piece on whether topsoil contains fertilizer clears up a question that trips up a lot of first-time buyers.
The practical rule is simple. Use the Free Dirt Calculator and fill dirt for the structural half of a job, such as grading around a repair priced with the Chimney Repair Cost Calculator or leveling a base for a shed. When you move on to planting beds and lawns, switch to topsoil and the dedicated Topsoil Calculator. Many yards use both on the same project: fill dirt to build the shape and a cap of topsoil on top for anything green. If you are weighing your options between soil types for a bed, the comparisons of topsoil versus garden soil and topsoil versus compost are worth a read before you order.
A Quick Field Guide to the Types of Dirt You Can Order
Walk into a bulk supply yard and you will hear a handful of names thrown around, and knowing them saves you from paying for the wrong pile. Clean fill is fill dirt with no trash, concrete, or roots in it, and it is what you want for any fill you plan to build on. Structural fill is graded and often engineered to compact to a specific density, used under slabs and driveways. Screened dirt has been run through a mesh to pull out rocks, roots, and clumps, which makes it far easier to rake and level for finish work. Unscreened dirt is cheaper by the yard but arrives with stones and lumps you will have to work around.
On the growing side you have topsoil, garden soil, and compost, which are often confused. Garden soil is usually topsoil that has been blended with compost and amendments for planting, while compost is decomposed organic matter used to enrich soil rather than to bulk it out. If you are stocking a container or raised bed, be careful not to reach for the wrong bag, because the differences between topsoil and potting soil matter a great deal once water and roots get involved. For a bed built on top of fill, the guide on using topsoil in a garden or raised bed explains the right blend to aim for.
Sand and gravel round out the yard. Both are heavier and drain faster than dirt, and both are priced and hauled the same way, by the cubic yard. Whatever material you land on, the volume you enter into the Dirt Calculator stays the same, because a cubic yard of space is a cubic yard of space regardless of what you fill it with. What changes is the weight and the price, which is why the sections below on weight and cost are worth a careful look before you commit to a load.
The Mathematics of Volume: Converting Dimensions to Cubic Yards
Bulk materials like dirt, sand, and gravel are almost always sold by the cubic yard, so that is the number you are really after. A cubic yard is a block of material three feet long, three feet wide, and three feet tall, which works out to 27 cubic feet. To find how many of those blocks your project needs, you measure the space you want to fill in three directions: length, width, and depth, all in feet.
1. Cubic Feet = Length (ft) × Width (ft) × Depth (ft)
2. Cubic Yards = Cubic Feet ÷ 27
Pro Tip: To convert inches of depth to feet, divide by 12. Six inches is 0.5 feet, and four inches is 0.33 feet.
Depth is where most mistakes hide, because it is usually measured in inches while everything else is in feet. A patch that is 20 feet by 10 feet filled to 6 inches is not 20 times 10 times 6. It is 20 times 10 times 0.5, which is 100 cubic feet, or about 3.7 cubic yards once you divide by 27. If you would rather see the whole method worked through with real examples, the walk-through on how much material you need does exactly that, and the explainer on how many cubic feet are in a yard covers the conversion from the other direction.
This is the same discipline that keeps any build square. Getting the base dimensions right the first time is what the Free Stair Calculator does for risers and treads, and what the Square Feet Calculator does for area. Whether you are stacking steps or stacking cubic yards, measuring twice is what prevents the costly second delivery.
Measuring Odd Shapes and Uneven Depth Without Guessing
Real yards are rarely tidy rectangles, and that is where estimates fall apart. The fix is to stop trying to measure the whole thing at once and instead break the area into shapes you can handle. Split an L-shaped patio into two rectangles, measure each on its own, and add the two volumes together. A rough circle, like the base for a round patio, can be measured by treating it as a square that just contains it and trimming your estimate down a little, or by measuring the radius and using the calculator’s area tools.
Depth causes even more trouble than shape, because the ground is almost never level. If you are filling a slope or a dip, do not measure the deepest point and use that everywhere, or you will badly over-order. Instead, take the depth in several spots across the area, from the shallowest to the deepest, and use the average. For a hole that is 4 inches deep on one side and 12 inches on the other, an average of about 8 inches is far closer to reality than either extreme. Getting the right depth for your project matters just as much for structural fill as it does for a seed bed.
Once you have your rectangles and your average depths, run each piece through the Dirt Calculator and total them. If the shape is genuinely complex, it is better to slightly over-measure each piece than to leave gaps, because a small buffer is cheaper than a return trip. The related read on how much area a yard of material covers is a handy cross-check: if your total yardage would cover far more or far less ground than you actually have, you know a measurement slipped somewhere.
Bags vs. Bulk: Finding the Economical Choice
For a small job, like topping off a couple of planters or patching a bare patch in the lawn, bagged dirt is the sensible pick. It is clean, easy to carry, and you buy only what you need. A standard bag holds somewhere between 0.75 and 1 cubic foot, and the 40-pound bag is the one you will see most often. The trouble starts when the job grows, because it takes a surprising number of bags to add up to a real volume. A single cubic yard is 27 cubic feet, which works out to roughly 27 to 36 bags depending on the size, and the piece on how many bags are in a yard lays that out with a full chart.
| Project size | Best option | Why |
|---|---|---|
| Under 0.5 cubic yard | Bags | No delivery fee, buy the exact amount |
| 0.5 to 1 cubic yard | Bags or bulk pickup | Break-even zone; compare price and effort |
| 1 to 3 cubic yards | Bulk delivery | Far cheaper per yard than bagged |
| 3+ cubic yards | Bulk delivery | Bagging this much is impractical and costly |
Once you cross about one cubic yard, buying in bulk almost always wins on price, sometimes by a wide margin. Preparing the ground for something large, such as an asphalt driveway, is a bulk job every time. Use the Dirt Calculator to see whether your volume clears that one-yard line, and if it does, it is worth the phone call to a supply yard. To make that call count, the guides on where to buy soil in bulk and which stores stock it tell you who to ask and what to ask for. If your material will sit for a while before you use it, the note on whether bagged soil goes bad in storage is worth a glance too.
What Dirt Costs and How Delivery Actually Works
Bulk dirt is one of the cheaper materials by the yard, but the price you pay at the curb is rarely just the dirt. Fill dirt is usually the least expensive option because it is a byproduct of other excavation work, and clean or screened fill costs a little more for the extra processing. Topsoil sits above fill on price, and screened or premium blends higher still. On top of the material itself sits the delivery fee, which is charged per trip and climbs with distance, so the further you are from the yard, the more each load costs to bring out.
That fee structure is the single biggest reason to get your volume right the first time. One delivery of the correct amount is far cheaper than two deliveries because the first order came up short. For a full picture of pricing by the yard, the ton, the bag, and the truckload, the breakdown on what soil and dirt cost is the most detailed reference we have, and it pairs naturally with the guide on where to buy in bulk near you.
Delivery itself is simple but worth planning. The truck backs up and dumps the load in one spot, usually the driveway, so the pile lands where you can reach it but not where it blocks the garage or the path you need. Clear low branches and gate-width obstacles before the truck arrives; if a tree is in the way, price the work first with the Tree Removal Cost Calculator rather than discovering the problem while a loaded truck idles in the street. Knowing how many yards fit in a dump truck also helps you picture the size of the pile before it lands.
Step-by-Step Volume Estimation Guide
Measure the length and width of the space to be filled. For anything that is not a clean rectangle, break it into smaller rectangles and measure each one separately.
Take the depth in several places and average them, especially on a slope or a dip. Using the deepest point everywhere is the fastest way to over-order.
Enter your dimensions into the Free Dirt Calculator to get the total in cubic yards. Add up the pieces if you split the area.
Add 10 to 15 percent to the total to cover compaction and settling. The guide on how much soil settles explains why this step is not optional.
Confirm your load’s weight against your vehicle or the delivery plan, and clear the path. If branches are in the way, the Tree Removal Cost Calculator helps you budget the clearing.
Place the order and be ready to move or spread the pile promptly, since a loose heap in the driveway is both a trip hazard and an erosion risk if rain arrives first.
Accounting for Compaction and Settling
A fresh pile of dirt is full of air. The moment it is spread, walked on, rained on, or run over with a plate compactor, that air is squeezed out and the volume shrinks. If you order the exact raw volume your measurements suggest, you will end up short once the material settles, and the finished grade will sit low. That is why every experienced crew orders a little extra. How much extra depends on the soil: sandy material settles the least, often only 2 or 3 percent, while clay-heavy dirt can drop 15 to 20 percent or more once it is compacted properly.
The safe habit is to add 10 to 15 percent to your calculated volume for most fill work, and to lean toward the higher end for clay. On structural fill, the material should be placed and compacted in thin layers, called lifts, of about 6 to 8 inches rather than dumped in one deep pile, because a deep pile only compacts at the top and hides soft material underneath. The full reasoning behind firming and settling, including how long to let a fresh grade rest before you build or plant on it, is covered in the guide on compacting and settling soil.
This settling factor deserves the same respect as any other tolerance on a build. The margins you allow here are as important as the clearances checked with the Pool Enclosure Height Calculator when planning a structure. Under-fill and you get a low spot that collects water; over-compact topsoil meant for planting and you choke the roots. A properly firmed base of fill, on the other hand, gives you a stable footing for outdoor steps, stone walkways, and paths.
Weight Logistics and Delivery Estimates
Dirt is far heavier than people expect, and underestimating that weight is how driveways get cracked and truck springs get bent. A single cubic yard of dry dirt weighs roughly 2,000 to 2,200 pounds, which is about a ton. Let that same yard soak up rain and it can climb toward 3,000 pounds. A typical half-ton pickup can only carry about half a yard of dirt safely, and even a three-quarter-ton truck is near its limit at one yard. The full breakdown lives in the guide on how much a yard of soil weighs, which includes a chart for one through ten yards.
| Amount | Approx. weight (dry) | How to move it |
|---|---|---|
| 1 cubic yard | ~2,000 to 2,200 lb (about 1 ton) | Small trailer or half a pickup load |
| 3 cubic yards | ~3 tons | Single-axle dump delivery |
| 10 cubic yards | ~10 tons | Tandem dump truck delivery |
Before you decide to haul dirt yourself, check your vehicle’s payload rating and be honest about it, because dirt reaches the weight limit long before it fills the bed. For most homeowners, paying for delivery is cheaper than repairing a vehicle. If a delivery is quoted in tons rather than yards, the conversion in the guide on yards of soil in a ton keeps you from ordering the wrong amount. And once the pile lands, moving it is its own project: a cubic yard is roughly nine wheelbarrow loads, so have help and a plan ready. The same logistics apply to any heavy material you might order alongside dirt with the Cubic Yard Calculator, such as concrete or gravel.
Grading for Drainage and Structural Safety
Grading is the quiet hero of a dry, stable property. Done right, it slopes the ground gently away from your foundation so rainwater runs off instead of pooling against the house. The general target most builders aim for is a drop of about 6 inches over the first 10 feet away from the foundation. Fill dirt is the material that builds that slope, and the Dirt Calculator is how you work out how much it takes to raise a low corner to the height it needs to be.
Grading ties into the rest of the property more than people realize. If you are adding a structure like a screened lanai or a pool cage, plan the build with the Pool Enclosure Height Calculator and shape the dirt beneath it so water sheds away rather than collecting under the frame. The same logic reaches all the way up to the roofline: water thrown off a roof during a repair priced with the Chimney Repair Cost Calculator has to land on ground that carries it away from the house, not toward it. Even an interior comfort upgrade like the layout you plan with the Recessed Lighting Calculator rests on a building that stays dry from the ground up.
The connection between grading and healthy ground runs both ways. A well-shaped grade sheds water, and a covered grade holds its shape. Bare graded fill that is left exposed will not stay where you put it, which is the subject of the next section. If part of your plan is establishing a lawn on top of the new grade, the guides on whether you need topsoil to grow grass and prepping the ground before sod pick up right where the grading leaves off.
Keeping Bare Dirt From Washing Away
Freshly placed dirt is at its most vulnerable the moment it is spread and before anything is holding it down. A single heavy rain can carve channels through an exposed grade, wash your carefully measured fill into the street, and leave you re-ordering material you already paid to move. This is not a small effect either; erosion is the same force that strips farmland of its most productive layer, and the article on how erosion works and how to slow it explains why bare soil and moving water are such a bad combination.
The fix is to cover the ground as soon as you reach your final grade. On slopes and structural fill, that might mean gravel, riprap, or an erosion blanket. On anything you intend to plant, it means getting a cover of grass or groundcover established quickly. If a lawn is the plan, the guides on putting topsoil down before grass seed and how to spread soil evenly walk through doing it so the seed takes and the surface knits together before the next storm. Mulch is another fast, cheap way to hold a surface while plants establish.
There is a subtler point here too, which is that the type of soil on the surface changes how fast it washes. Loose, screened topsoil that has not been seeded is easy for water to move, while a firmed, planted surface is far more stable. For the broader stormwater side of the picture, the U.S. Environmental Protection Agency’s guidance on soil erosion and sediment control is a solid outside reference, and it reinforces the same message: get bare dirt covered, and do it sooner rather than later.
Coverage and Depth: How Far a Yard of Dirt Really Goes
One question comes up on almost every job: if I order a yard, how much ground will it actually cover? The answer depends entirely on how thick you spread it, and that trips people up because depth and coverage pull against each other. Spread a single cubic yard one inch thick and it covers a generous 324 square feet. Spread that same yard four inches thick and it covers only about 81 square feet. The material has not changed; only how far you stretched it.
| Depth | Area 1 cubic yard covers |
|---|---|
| 1 inch | ~324 square feet |
| 2 inches | ~162 square feet |
| 3 inches | ~108 square feet |
| 4 inches | ~81 square feet |
| 6 inches | ~54 square feet |
This table is the fastest sanity check you have. Once the calculator gives you a yardage, glance at the coverage you expect at your chosen depth and make sure it matches the size of the area in front of you. The deeper reference on how much area a yard covers extends this to bags and tons, and the guide to how big a yard of material actually is helps you picture the pile before it arrives so the delivery is not a surprise.
Integrating Dirt with Your Garden and Renovation Plan
Structural fill is only the first act. Once the grade is set and stable, the fun part begins, and it is where the dirt project connects to the rest of the property. If a lawn or beds are next, plan the planting with the Grow a Garden Calculator and cap your fill with quality topsoil. The guide on using topsoil in a garden or raised bed explains the right soil-to-compost blend, and the read on keeping weed seeds and landscape fabric in check saves you a season of pulling weeds you imported by accident.
Dirt work also opens the door to the built features around a yard. If you are banking up ground for a new deck, the Board Foot Calculator turns your framing plan into a lumber volume and cost, while a fresh coat of stain or paint on nearby fences and structures is easy to budget with the Paint Cost Calculator. Even the indoor projects belong to the same push toward a finished, higher-value home, whether that is a refresh priced with the Kitchen Cabinet Painting Cost Calculator or a full paint budget from the Interior Painting Cost Calculator.
The thread running through all of it is that one well-measured load of dirt sets up everything that follows. A stable, well-drained grade is what lets a lawn take, a deck sit level, and a patio stay put. If you are deciding what to grow on your new ground, the comparisons of topsoil and garden soil and the primer on how topsoil forms in the first place help you choose and care for the surface layer that all your plants will live in.
Common Mistakes That Quietly Waste Money
The errors that cost the most are rarely dramatic. The most common one is measuring depth at the deepest point and applying it everywhere, which can leave you paying for a third more material than the job needs. Its mirror image is forgetting the settling buffer entirely, so the finished grade sinks below where it should be and you are back ordering a top-up load and paying a second delivery fee. Both come straight back to the two ideas at the heart of this guide: measure the average, then add 10 to 15 percent.
The other frequent misstep is using the wrong material. Filling a structural void with topsoil feels harmless until it decomposes and the surface slumps a year later, and using cheap unscreened fill where you needed a clean finish grade leaves you picking rocks out of a lawn for months. Matching the material to the job, guided by the difference between topsoil and fill covered earlier, avoids the most expensive kind of do-over. It is also worth confirming your number against a second angle before you order, which is exactly what the how much do I need walk-through is for.
Finally, do not ignore the logistics. Underestimating weight damages vehicles, blocking the delivery path wastes the driver’s time and sometimes your money, and leaving a bare pile out through a storm can wash away material you already paid to move. A few minutes spent on access, weight, and covering the finished grade protects the careful measuring you did at the start. When the whole plan comes together, budget the surrounding pieces too, from resurfacing with the Asphalt Calculator to keeping a nearby pool balanced with the Pool Salt Calculator.
Frequently Asked Questions (FAQ)
How much dirt do I need for my project?
Multiply the length, width, and depth of the area in feet, then divide by 27 to get the volume in cubic yards. Measure depth as an average if the ground is uneven, and add 10 to 15 percent for settling. The how much do I need guide works through several real examples if you want to check your method.
How many wheelbarrows are in a cubic yard?
A standard medium wheelbarrow holds about 3 cubic feet, so with 27 cubic feet in a yard you are looking at roughly 9 loads to move one cubic yard. A smaller barrow can push that toward 14 loads, which is worth knowing before you move several yards by hand.
How much does a yard of dirt weigh?
About 2,000 to 2,200 pounds when dry, or close to a ton, and up to roughly 3,000 pounds when wet. That weight is why a half-ton pickup should carry only about half a yard at a time. The soil weight guide has a full chart, and the tons to yards conversion helps if your supplier quotes weight instead of volume.
Will dirt wash away if I don’t cover it?
Yes. Loose, exposed dirt erodes quickly in rain and wind. As soon as you reach your final grade, cover it with sod, seed and mulch, gravel, or an erosion blanket. The article on soil erosion explains how fast it happens and how to prevent it.
Can I use dirt to fill a pool?
Yes, but it has to be compacted in thin 6 to 8 inch lifts to prevent future sinkholes, and topsoil should never be used for the structural portion. Filling even a small pool can take 40 to 60 cubic yards, so run the numbers through the Dirt Calculator first and read up on compacting and settling before you start.
What is the difference between screened and unscreened dirt?
Screened dirt has been passed through a mesh to remove rocks, roots, and clumps, which makes it much easier to rake and level for finish work. Unscreened dirt is cheaper but arrives with stones and lumps. For what goes into the soil itself, see what topsoil is made of.
How much extra dirt should I order for settling?
Add about 10 to 15 percent to your calculated volume, and lean toward the higher end for clay-heavy soil, which compacts the most. Sandy material settles the least. The settling guide explains how to firm the ground correctly so the finished grade holds.
Should I buy dirt in bags or in bulk?
Bags make sense under about half a cubic yard, where you avoid delivery fees and buy the exact amount. Past one cubic yard, bulk delivery is almost always cheaper. See how many bags are in a yard and where to buy in bulk to weigh the two.
Is fill dirt or topsoil better for leveling a yard?
For structural leveling that needs to stay put, use fill dirt, then cap it with topsoil if you plan to grow anything on top. Topsoil alone will decompose and settle over time. The comparison of topsoil and garden soil helps you pick the right surface layer once the fill is in.
Final Strategy
The Dirt Calculator earns its keep by turning a vague sense of how much you need into a firm number you can order against. Measure the area in pieces, average your depths, divide by 27, and add a buffer for settling, and you have a figure that matches the truck to the task. From there it is about handling the material well: matching fill dirt or topsoil to the job, respecting how much a yard weighs, and covering bare ground before the weather finds it. Do those things and you get a stable, well-drained grade that serves as the foundation for everything you build on top of it.
Whenever a single question grows big enough to deserve its own answer, the topsoil blog has a full guide waiting, from what it all costs to how deep to lay it. And from planning your driveway surfacing to balancing your pool chemistry, the wider home calculators library is built to give you the technical data for the whole property. For geotechnical and site-preparation standards, the American Society of Civil Engineers and the USDA’s Natural Resources Conservation Service soils resources are reliable outside references worth bookmarking.
