Cubic Yard Calculator: Soil Volume Direct

This calculator works out the volume of soil you need in cubic yards. You enter the length, width, and depth of the area you want to fill, and it returns the exact cubic yardage, plus the equivalent in cubic feet and cubic meters. Use it before ordering topsoil, garden mix, or fill dirt so you buy the right amount and avoid waste.

Formula

The formula for cubic yards is straightforward: multiply length by width by depth (all in feet) and divide by 27, because there are 27 cubic feet in one cubic yard.

In symbols: V = (L × W × D) / 27

• V = volume in cubic yards (yd³)
• L = length in feet (ft)
• W = width in feet (ft)
• D = depth in inches (in), converted to feet by dividing by 12

If you measure in meters, the equivalent is: V = L × W × D (all in meters) × 1.30795 to get cubic yards, or simply compute cubic meters and convert.

Worked Example

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

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

The calculator rounds to two decimals, giving 0.93 cubic yards. That matches the headline output.

Why Use Cubic Yards for Soil?

Soil, mulch, and gravel are sold by the cubic yard in the US and Canada. A cubic yard is a cube 3 feet on each side—about the size of a standard washing machine. When you order from a landscape supply company, they load a truck that carries a certain number of cubic yards. Knowing your volume in yards lets you communicate directly with the supplier and compare prices per yard.

For small projects, buying bagged soil from a garden center is common. Bags are typically 1 or 2 cubic feet each. To convert your cubic yards to bags, multiply by 27 (for 1-ft³ bags) or by 13.5 (for 2-ft³ bags). For the example above, 0.93 yd³ would need about 25 one-cubic-foot bags—a good illustration of why bulk ordering is cheaper for large areas.

How to Measure Your Area Correctly

Accurate measurements are the key to a correct volume. Here are the steps:

• Length and width: Measure in feet, using a tape measure. For irregular shapes, break the area into rectangles, calculate each, and add them together.
• Depth: Decide how deep you want the soil. For a new garden bed, 6–8 inches is typical. For a lawn topdressing, 1–2 inches. For raised beds, measure the actual height of the bed.
• Units: Keep everything in the same unit. If you measure in inches, convert to feet by dividing by 12. If you measure in yards, multiply by 3 to get feet.
• Compaction: Soil settles after watering. If you’re filling a large area, add 10–15% extra to account for settling, especially if you plan to tamp it down.

Common Mistakes and How to Avoid Them

The most frequent error is mixing units. For example, measuring length in feet and width in inches, then multiplying without converting. Always convert everything to feet first.

Another mistake is forgetting to divide by 27. People often compute cubic feet and then order that number in yards, which results in 27 times too much soil. Conversely, some divide by 9 (thinking of square yards), which gives a volume that is one-third of the correct amount.

A third issue is not accounting for the shape. A circular bed requires the formula π × r² × depth. For a triangle, use ½ × base × height × depth. The calculator above works for rectangles; for other shapes, use the appropriate formula and then convert to yards.

Cost and Ordering Considerations

While this calculator gives you the volume, you’ll also need to think about cost and delivery. Prices for soil vary widely by region, quality, and quantity. Typically, bulk soil is cheaper per yard than bagged, but you may have to pay a delivery fee. Some suppliers have a minimum order (e.g., 3 cubic yards) because small loads aren’t profitable.

When ordering, ask if the price includes delivery and whether the soil is screened (free of rocks and debris) or unscreened. Also, confirm the moisture content—wet soil weighs more, but volume is what you’re paying for. If you’re picking it up yourself, check the weight capacity of your vehicle. A cubic yard of dry topsoil weighs about 2,000–2,500 pounds, but wet soil can be 3,000 pounds or more.

Safety and Handling

Moving soil is hard physical work. Use proper lifting techniques—bend at the knees, not the back. If you’re having a truck deliver, make sure the driver can access the drop-off point and that the ground can support the weight of the truck. For large projects, consider renting a wheelbarrow or a small conveyor. Wear gloves and a dust mask if the soil is dry and dusty. If you’re using soil for edible gardens, choose a product labeled for that purpose, as some soils contain fertilizers or compost that may not be suitable for all plants.

Alternatives to Bulk Soil

If you only need a small amount, bagged soil from a garden center is convenient, but it’s more expensive per cubic foot. For raised beds, you might consider a soil blend with compost and peat moss, which is lighter and richer. Another alternative is to use a soil calculator that works in cubic feet or cubic meters if your supplier uses those units. Some online calculators also let you input dimensions in feet and inches, but the math is the same—just convert everything to feet first.

Frequently Asked Questions

How many cubic feet are in a cubic yard?

There are 27 cubic feet in one cubic yard. This comes from 3 feet × 3 feet × 3 feet. So to convert cubic feet to cubic yards, divide by 27.

What depth of soil do I need for a raised garden bed?

Most vegetables need at least 6–8 inches of soil, but deeper is better for root crops. For a raised bed, you’ll typically fill it to the top, minus a few inches for mulch. Measure the interior height of the bed and use that as your depth.

How do I calculate soil for a circular area?

Use the formula for the area of a circle: π × radius². Then multiply by the depth (in feet) to get cubic feet, and divide by 27 to get cubic yards. For example, a 6-foot diameter circle (radius 3 ft) with 6 inches of soil: π × 9 × 0.5 = 14.14 ft³, which is 0.52 yd³.

Should I add extra soil for settling?

Yes, a 10–15% overage is a good idea, especially for loose, fluffy soil. After watering or rain, soil compacts and the level drops. Adding extra avoids a second order.

Can I use this calculator for mulch or gravel?

Yes, the volume calculation is the same for any bulk material. However, remember that weight per cubic yard differs: mulch is light (about 400–800 lbs), while gravel is heavy (about 2,500–3,000 lbs). The volume is what you need for ordering, but the weight matters for transportation and spreading.

What if my area is not a perfect rectangle?

Break it into rectangles, calculate each separately, and add the volumes. For more complex shapes, use the appropriate geometric formula for each part. The total is the sum of the parts.

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