Dirt Calculator

Introduction

The Dirt Calculator helps you figure out how much dirt or fill material you need for your construction project. Whether you are filling a hole, grading a yard, or preparing a foundation, knowing the right amount of dirt saves you time and money. Too little dirt means extra trips and delays. Too much dirt means wasted material and higher costs. This tool lets you enter your measurements and quickly calculates the volume of dirt you need in cubic yards or cubic feet. It also estimates the weight of the dirt so you can plan for hauling and delivery. Use this calculator before you order fill dirt, topsoil, or any other earth material to make sure you get the job done right the first time.

How to Use Our Dirt Calculator

Enter the size of the area you need to fill or excavate, and this calculator will tell you how much dirt you need in cubic yards and tons.

Length: Enter the length of the area you need to cover. This is the longest side of your project space. You can enter it in feet or meters. If you need help determining the area of your project, our Square Footage Calculator can assist.

Width: Enter the width of the area. This is the shorter side of your project space. Use the same unit of measurement as the length.

Depth: Enter how deep or thick the dirt layer needs to be. This is how high or low you want the dirt to go. You can enter this in inches, feet, or meters.

Dirt Type: Select the type of dirt or fill material you plan to use. Different types of dirt weigh different amounts. Common options include topsoil, fill dirt, and clay. This choice affects the total weight of dirt you need to order.

Density: This is how heavy the dirt is per cubic foot. If you know the exact density of your dirt, you can enter it here. If not, the calculator will use a standard value based on the dirt type you picked.

Once you fill in these fields, the calculator will show you the total volume of dirt in cubic yards and the estimated weight in tons. Use these numbers when ordering dirt from a supplier so you get the right amount for your project.

What Is a Dirt Calculator?

A dirt calculator helps you figure out how much dirt, soil, or fill material you need for a construction or landscaping project. Whether you are filling a hole, grading a yard, or preparing a foundation, knowing the right amount of dirt to order saves you time and money.

Why Calculating Dirt Matters

Ordering too much dirt means you waste money and have extra material sitting around. Ordering too little means delays and extra delivery fees. A dirt calculator takes the guesswork out of the process by using simple measurements — length, width, and depth — to give you an accurate volume of dirt needed. The same principle applies to other bulk materials like sand, gravel, and mulch.

How Dirt Volume Is Measured

Dirt is usually measured in cubic yards or cubic feet. Most suppliers sell dirt by the cubic yard. One cubic yard equals 27 cubic feet, which is roughly enough to fill a space 3 feet long, 3 feet wide, and 3 feet deep.

Types of Dirt Used in Construction

Not all dirt is the same. Here are the most common types used in construction projects:

• Fill dirt – Used to fill holes and raise ground levels. It contains no organic material, making it stable and less likely to shift over time.
• Topsoil – The top layer of earth, rich in nutrients. It is best for gardens, lawns, and landscaping. Use our Topsoil Calculator for more precise topsoil estimates.
• Clean fill – Free of debris and contaminants. Often required by local building codes for certain projects.
• Screened dirt – Filtered to remove rocks, roots, and clumps. Great for grading and creating smooth surfaces.

Things to Keep in Mind

Dirt compacts when it settles. This means you usually need to order about 10% to 20% more than your calculated amount to account for settling. For example, if your calculation says you need 10 cubic yards, consider ordering 11 to 12 cubic yards instead.

Also, keep in mind that one cubic yard of dirt weighs roughly 2,000 to 2,700 pounds depending on the type and moisture content. This matters when planning for delivery trucks and making sure your site can handle the load. If your project also involves pouring a foundation or slab, our Concrete Calculator can help you estimate concrete needs, while the Retaining Wall Calculator is useful for projects that require holding back earth. For projects involving aggregate base layers, consider checking our Pea Gravel Calculator or River Rock Calculator as well.

Frequently Asked Questions

How many cubic yards of dirt do I need for my project?

Multiply the length × width × depth of your area (all in feet), then divide by 27. For example, a space 20 ft long, 10 ft wide, and 0.5 ft deep equals 100 cubic feet ÷ 27 = about 3.7 cubic yards. Our dirt calculator does this math for you automatically.

How much does a cubic yard of dirt weigh?

It depends on the type. Fill dirt and screened topsoil weigh about 2,200 pounds per cubic yard. Red clay weighs around 2,600 lb/yd³. Potting soil is much lighter at about 1,400 lb/yd³. The calculator lets you pick your material type and shows the correct weight.

What is the difference between fill dirt and topsoil?

Fill dirt has no organic matter like roots or plant material. It is dense and stable, so it works well for filling holes and raising ground levels. Topsoil is the top layer of earth that contains nutrients. It is better for growing grass, plants, and gardens. Fill dirt is for structure; topsoil is for growing things.

What does the compaction factor do in this calculator?

The compaction factor adds extra volume to your order. Dirt settles and compresses after it is placed. If you enter 15% compaction, the calculator adds 15% more dirt to your total so you end up with enough material after it settles down.

How do I convert cubic feet of dirt to cubic yards?

Divide the number of cubic feet by 27. There are 27 cubic feet in one cubic yard. For example, 135 cubic feet ÷ 27 = 5 cubic yards.

Can I use this calculator for a circular area like a tree ring?

Yes. Click the Circular tab at the top of the calculator. Enter the diameter (or toggle to radius) and the depth. The calculator uses the formula π × r² × depth to find the volume for you.

What is the Area to Volume tab used for?

Use this tab when you already know the area in square feet but need to find the volume. Just enter your known area and the depth you want, and the calculator figures out the total cubic feet, cubic yards, and weight.

How many tons of dirt fit in a dump truck?

A standard single-axle dump truck holds about 5 to 6 tons of dirt. A tandem-axle dump truck can carry about 10 to 14 tons. Use the weight results from this calculator to figure out how many truckloads you need.

What is the custom density option for?

If you know the exact density of your dirt from a supplier or soil test, check the Use custom density box and type in the density in pounds per cubic yard. The calculator will use your number instead of the built-in default for that material type.

How do I calculate dirt for a triangular-shaped area?

Click the Triangular tab. Enter the base length, the triangle height (the straight-line distance from the base to the opposite point), and the depth of dirt you need. The calculator uses the formula ½ × base × height × depth.

Should I order extra dirt beyond what the calculator shows?

Yes. Use the compaction factor field to add 10% to 20% extra. This covers settling, spillage, and uneven ground. It is always better to have a little extra than to run short and pay for another delivery.

What is select fill dirt?

Select fill is a high-quality fill dirt that meets specific standards for grading and stability. It is free of large rocks, debris, and organic material. It is often required for building pads, road bases, and engineered projects. It is denser than regular fill dirt at about 2,700 lb/yd³.

How do I measure the depth if my ground is uneven?

Take depth measurements at several spots across the area. Add them together and divide by the number of measurements to get an average depth. Use that average in the calculator for a more accurate estimate.

Can I switch between feet, inches, yards, and meters?

Yes. Each input field has a unit dropdown next to it. You can pick feet, inches, yards, centimeters, or meters for each measurement separately. The calculator converts everything automatically.

How much does it cost to buy dirt?

Fill dirt typically costs $5 to $15 per cubic yard. Screened topsoil ranges from $15 to $40 per cubic yard. Prices vary by location and delivery distance. Use the cubic yard result from this calculator and multiply it by your local price per yard to get a cost estimate.