Fill Dirt Cubic Yard Calculator: How Much You Need

This calculator works out how many cubic yards of fill dirt you need to order for a landscaping or construction project. You enter the length, width, and depth of the area you want to fill, and it returns the volume in cubic yards, plus the equivalent in cubic feet and cubic meters. It uses the standard formula: volume = length × width × depth, then converts the result to cubic yards.

Formula

The core formula is straightforward:

Volume (cubic yards) = (Length × Width × Depth) ÷ 27

Where:

• Length – the longest horizontal dimension of the area, in feet (ft).
• Width – the shorter horizontal dimension, in feet (ft).
• Depth – how deep you want the fill dirt, in inches (in). It is divided by 12 to convert to feet.
• 27 – the number of cubic feet in one cubic yard (3 ft × 3 ft × 3 ft = 27 ft³).

If you measure in meters, the same formula gives cubic meters; one cubic yard equals approximately 0.7646 cubic meters.

Worked Example

Using the default values from the calculator above (length = 10 ft, width = 5 ft, depth = 6 in):

1. Convert depth to feet: 6 in ÷ 12 = 0.5 ft
2. Calculate volume in cubic feet: 10 ft × 5 ft × 0.5 ft = 25 ft³
3. Convert to cubic yards: 25 ft³ ÷ 27 = 0.93 yd³

The calculator rounds to two decimal places, giving 0.93 cubic yards. That is the amount of fill dirt you would need to order for this area.

Why Ordering the Right Amount Matters

Fill dirt is sold by the cubic yard, and delivery trucks are sized in whole or half yards. Ordering too little means you run out mid-project and have to pay a second delivery fee. Ordering too much means you have a pile of dirt you cannot easily return or dispose of. Most suppliers will deliver a minimum of 1 to 2 cubic yards, and many charge a delivery fee on top of the material cost. A cubic yard of fill dirt weighs roughly 2,000 to 2,700 pounds depending on moisture and composition, so a full truckload can be 10 to 15 tons – a serious weight that can damage driveways or lawns if the truck drives over them.

How to Measure Your Area Correctly

Accurate measurements are the difference between a smooth project and a frustrating one. Here are the steps to get them right:

• Use a tape measure or laser distance measurer, not a guess. For irregular shapes, break the area into rectangles and calculate each separately, then add the volumes together.
• Measure length and width in feet. If you have inches, convert them to decimal feet (e.g., 6 inches = 0.5 ft).
• Measure depth in inches at several points – the ground is rarely level. Use the average depth. If you are filling a hole, measure from the bottom to the desired finished level.
• Add 10–15% extra for compaction. Fill dirt settles, especially if you are using it to raise a grade or backfill a foundation. The calculator gives the loose volume; after tamping, you may need more.

Common Mistakes and How to Avoid Them

The most frequent error is mixing units. If you measure length in feet and depth in inches, you must convert one of them before multiplying. The calculator does this automatically, but if you are doing it by hand, always convert depth to feet first.

Another mistake is forgetting that a cubic yard is a volume, not a weight. A yard of dry topsoil weighs much less than a yard of wet clay. When ordering by weight (some suppliers quote per ton), you need to know the density of the material. A typical fill dirt density is about 1.1 to 1.5 tons per cubic yard, but this varies widely. Ask your supplier what density they assume when converting.

Finally, people often underestimate how much compaction reduces volume. Sandy soil compacts less than clay, but any fill will settle. If you need the final grade to be exactly level, order extra and plan to add more after settling.

Fill Dirt vs. Topsoil vs. Sand: What to Order

Fill dirt is the subsoil found below the topsoil layer. It contains rocks, clay, and sand, and is used for raising ground levels, filling holes, or creating a base for structures. It is not suitable for planting because it lacks organic matter.

Topsoil is the nutrient-rich upper layer, used for lawns and gardens. It costs more than fill dirt and is sold in the same cubic yard units. If you are filling a hole and then planting grass, you might need both: fill dirt for the bulk, then a few inches of topsoil on top.

Sand is used for drainage or as a base for pavers. It is also sold by the cubic yard but has a different density. The calculator works for any bulk material, but the weight and cost per yard will differ.

How Much Does It Cost?

Prices vary widely by region and supplier, but a general range for fill dirt is $5–$15 per cubic yard if you pick it up yourself. Delivery adds $50–$150 depending on distance and quantity. Topsoil runs $15–$30 per yard, and sand $15–$25 per yard. These are rough estimates – always get a quote from a local supplier. The calculator tells you the volume you need, so you can compare quotes accurately.

Safety and Practical Tips for Delivery

Before ordering, check access for the delivery truck. A standard dump truck needs about 12 feet of width and 12 feet of height clearance. If the truck cannot reach the work area, you will need to move the dirt by wheelbarrow, which is significant labor for even a few yards.

If you are filling a deep hole (more than 3 feet), be aware of the risk of collapse. Never stand in a deep trench while soil is being dumped or compacted. Also, do not place fill dirt against a building foundation without checking drainage – it can direct water toward the structure. For large projects, consult a professional engineer or landscaper.

Frequently Asked Questions

How many cubic feet are in a cubic yard?

Exactly 27 cubic feet. A cubic yard is a cube that is 3 feet long, 3 feet wide, and 3 feet high. This is why the formula divides by 27.

How much does a cubic yard of fill dirt weigh?

It depends on moisture and composition. Dry fill dirt typically weighs about 2,000 to 2,200 pounds per cubic yard. Wet clay can weigh over 2,700 pounds. If you are ordering by weight, ask the supplier for the density they use.

Can I use fill dirt for a garden?

No. Fill dirt is subsoil and lacks organic matter, so plants will struggle. Use it for leveling or backfilling, then add 4–6 inches of topsoil on top for planting.

How much will a cubic yard of fill dirt cover?

At a depth of 3 inches, one cubic yard covers about 108 square feet. At 6 inches deep, it covers 54 square feet. The calculator above will give you the exact amount for your specific dimensions.

Should I order extra fill dirt for compaction?

Yes. Most fill dirt settles 10–15% after being compacted. If you need the final grade to be exact, order 10–15% more than the calculated volume and add it after settling.

Can I calculate for a circular area?

The calculator works for rectangular areas. For a circle, measure the radius (half the diameter), square it, multiply by π (3.1416), then multiply by depth. Convert to cubic yards by dividing by 27. For example, a 10-foot diameter circle, 6 inches deep: (5² × 3.1416 × 0.5) ÷ 27 = 1.45 cubic yards.

Related

• Cubic Feet Calculator: How to Find Volume
• Degrees to Meters Calculator: Convert Angles to Distance
• Decimal to Fraction Calculator Nearest 1/16

in l | Length | ft | 10 | 0
in w | Width | ft | 5 | 0
in d | Depth | in | 6 | 0
out yards | Cubic yards | yd³ | (l * w * (d / 12)) / 27 | 2
out feet | Cubic feet | ft³ | l * w * (d / 12) | 2
out meters | Cubic meters | m³ | (l * w * (d / 12)) * 0.0283168 | 2