Dirt Yard Calculator: How Many Yards Do You Need?

This calculator works out how many cubic yards of dirt, topsoil, or fill you need for a rectangular area. You enter the length, width, and depth (in feet or inches), and it returns the volume in cubic yards, plus the equivalent in cubic feet and cubic meters. The result is the amount you should order, assuming the area is a simple rectangle with a flat bottom.

Formula

The basic formula for volume is the same whether you are filling a garden bed, leveling a yard, or building a small berm:

Cubic yards = (Length × Width × Depth) ÷ 27

Where:

• Length is the longest side of the area, in feet (ft)
• Width is the shorter side, in feet (ft)
• Depth is how deep you want the dirt, in feet (ft) – if you measure in inches, convert first by dividing by 12
• 27 is the number of cubic feet in one cubic yard (3 ft × 3 ft × 3 ft)

If you are working in inches for all three dimensions, the formula becomes:

Cubic yards = (Length × Width × Depth in inches) ÷ 46,656

That second number is 36 × 36 × 36, the number of cubic inches in a cubic yard.

Worked Example

Using the default values from the calculator – a bed that is 10 ft long, 5 ft wide, and 6 inches deep – here is the step-by-step calculation:

1. Convert depth to feet: 6 inches ÷ 12 = 0.5 ft
2. Find the volume in cubic feet: 10 ft × 5 ft × 0.5 ft = 25 ft³
3. Convert to cubic yards: 25 ft³ ÷ 27 = 0.926 yd³

The calculator rounds to two decimal places, so it shows 0.93 cubic yards. In practice, you would round up and order at least 1 cubic yard because suppliers sell in whole yards.

When to Use This Calculator

Use this tool whenever you are ordering bulk material for a project that has a roughly rectangular footprint. Common situations include:

• Filling a new raised garden bed with topsoil
• Adding a layer of fill dirt to level a low spot in a lawn
• Ordering gravel or sand for a patio base
• Planning a small berm or mounded landscaping feature

For irregular areas, break the shape into rectangles, calculate each one, and add the results. For a circle (like a round garden bed), use a different formula: π × radius² × depth, then divide by 27. For a triangle, use ½ × base × height × depth.

How to Measure Correctly

Accuracy starts with measurement. A tape measure is fine for small areas, but for larger yards use a measuring wheel or a long tape. Here are the key points:

• Measure length and width in feet, not yards. Mixing units is the most common error.
• Measure depth in inches if the layer is thin (like 2–6 inches), then convert. If you measure in feet, keep it as a decimal (e.g., 0.5 ft, not 6 in).
• If the ground is uneven, take several depth measurements and average them.
• For a sloped area, the depth should be measured perpendicular to the surface, not along the slope.

When in doubt, round your measurements up by 5–10%. Dirt settles, and it is cheaper to have a little extra than to pay a delivery fee for a second load.

Common Mistakes and Misconceptions

Even with a correct formula, people often order the wrong amount. Here is what goes wrong most frequently:

• Mixing feet and inches: 6 inches is 0.5 feet, not 0.6. Always convert before multiplying.
• Forgetting to divide by 27: A cubic yard is 3×3×3, so there are 27 cubic feet in a yard, not 9 (which is square yards in a square yard).
• Assuming a yard of dirt weighs the same as a yard of gravel: They do not. Topsoil weighs about 1,000–1,200 lb per cubic yard, while gravel can be 2,400–2,900 lb. This matters for delivery vehicle limits and whether your ground can support the load.
• Ordering by the ton: If a supplier quotes per ton, you need to know the density of the specific material. A common rule of thumb is 1 cubic yard of topsoil ≈ 1 ton, but this varies with moisture content.
• Ignoring compaction: Freshly placed dirt settles. If you need a final depth of 6 inches, order extra – often 10–15% more – to account for settling.

How to Order and What to Expect

When you call a landscape supply or excavation company, they will ask how many cubic yards you need. Most suppliers sell in whole or half yards, and they deliver in dump trucks. Here is what to know:

• Delivery fees are separate from material cost, and minimum orders are common (often 1–3 yards).
• If you pick up yourself, know the volume capacity of your truck bed. A standard full-size pickup holds about 2 cubic yards if filled level, but weight limits often cut that in half for dirt.
• For large projects (more than 5 yards), ask about bulk discounts, but do not let a discount push you into ordering more than you need.
• Topsoil is screened and often mixed with compost; fill dirt is cheaper and less fertile. Make sure you order the right type for your project.

Safety and Practical Limits

Moving dirt is hard physical work. A cubic yard of topsoil weighs roughly 1,000 pounds – that is half a ton. Consider these points before you start:

• Do not overload a pickup truck or trailer; check the payload rating in the owner’s manual. Overloading is dangerous and illegal on public roads.
• When spreading by hand, use a wheelbarrow and a shovel, and take breaks. A single cubic yard is about 10–12 full wheelbarrow loads.
• If you are filling a deep hole (more than 4 feet), be aware of trench collapse risks. For utility work, call local utility locators before digging.
• Wear gloves and a dust mask if the material is dry and dusty. Some fill dirt may contain debris, so inspect it as you spread.

Frequently Asked Questions

How many cubic feet are in a cubic yard?

There are 27 cubic feet in one cubic yard because a yard is 3 feet long, and 3 × 3 × 3 = 27. This is the key conversion for all dirt volume calculations.

How much does a cubic yard of dirt weigh?

It depends on the material and moisture. Dry topsoil weighs about 1,000–1,200 lb per cubic yard; wet topsoil can be 1,500 lb or more. Fill dirt is similar. Gravel and sand are heavier, around 2,400–2,900 lb per cubic yard. Always ask the supplier for the weight of their specific product if you are concerned about vehicle limits.

How many wheelbarrow loads are in a cubic yard?

A typical contractor wheelbarrow holds about 3 cubic feet. So 27 ÷ 3 = 9 loads, but most people use a smaller home wheelbarrow (2–3 cubic feet), so expect 9 to 14 loads per cubic yard. The actual number depends on how heaped the wheelbarrow is.

Should I order extra dirt for settling?

Yes, for most projects. Loose dirt settles after rain and time, so add 10–15% to your calculated volume. For example, if your calculator says 3 cubic yards, order 3.5. For a flower bed that will be planted immediately, you can skip the extra because the bed will be topped up later.

Can I use this calculator for gravel or sand?

Yes, the volume calculation is identical for any bulk material – dirt, gravel, sand, mulch, or compost. The only difference is weight per cubic yard, which you need for delivery limits but not for volume. Mulch is much lighter (about 400–800 lb per yard), so you can often haul more by volume than by weight.

Related

• Decimal Inches to Fraction Calculator: How It Works
• Decimal Feet to Fraction Calculator: Step-by-Step
• Cylinder Volume Calculator Gallons: How to Use

in length | Length | ft | 10 | 0
in width | Width | ft | 5 | 0
in depth | Depth | in | 6 | 0
out yards | Cubic yards | yd³ | (length * width * (depth / 12)) / 27 | 2
out feet | Cubic feet | ft³ | length * width * (depth / 12) | 1
out meters | Cubic meters | m³ | (length * width * (depth / 12)) * 0.0283168 | 2