Cubic Yard Calculator Stone: Volume & Weight

A cubic yard calculator for stone works out the volume of stone you need in cubic yards from the length, width, and depth of the area you plan to fill, and then converts that volume to an estimated weight in tons. You enter the area’s dimensions and the depth of the stone layer, and the calculator returns the cubic yards and the approximate tons required. This is the standard way to order crushed stone, gravel, or river rock for landscaping and construction projects.

Formula

The core formula for cubic yards of stone is:

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

Where:

• Length – the longer horizontal measurement of the area, in feet (ft)
• Width – the shorter horizontal measurement, in feet (ft)
• Depth – how thick the stone layer will be, in inches (in). Convert to feet by dividing by 12.
• 27 – the number of cubic feet in one cubic yard (3 ft × 3 ft × 3 ft = 27 ft³)

To get tons, multiply the cubic yards by the material’s density in tons per cubic yard. Typical densities are approximately:

• Crushed stone: 1.35 tons/yd³
• Gravel (bank run): 1.44 tons/yd³
• Limestone (crushed): 1.55 tons/yd³
• River rock (smooth): 1.68 tons/yd³

Worked Example

Using the default values from the calculator above (10 ft length, 10 ft width, 4 in depth, crushed stone):

1. Convert depth to feet: 4 in ÷ 12 = 0.333 ft
2. Calculate volume in cubic feet: 10 ft × 10 ft × 0.333 ft = 33.3 ft³
3. Convert to cubic yards: 33.3 ft³ ÷ 27 = 1.23 yd³
4. Estimate weight: 1.23 yd³ × 1.35 tons/yd³ = 1.66 tons

The calculator shows 1.23 cubic yards and 1.66 tons for these inputs. This means you would need to order about 1.25 cubic yards (or roughly 1.7 tons) of crushed stone to cover a 10×10 ft area at 4 inches deep.

Why Use Cubic Yards for Stone?

Stone is sold by volume (cubic yard) or by weight (ton), depending on the supplier. Most quarries and landscape yards price crushed stone and gravel by the ton, but they often require you to know the volume you need to estimate cost. A cubic yard calculator bridges that gap. It lets you measure your project area in feet and inches (the units you can actually measure with a tape) and converts to the units the supplier uses. Without this conversion, it is easy to over-order by 50% or under-order and run short mid-project.

How to Measure Your Area Correctly

Accurate measurements are the difference between a smooth project and a frustrating one. Follow these steps:

• Use a tape measure or measuring wheel, not a guess. For irregular shapes, break the area into rectangles, calculate each, then add them together.
• Measure length and width in feet. If you have inches, convert to decimal feet (e.g., 6 ft 3 in = 6.25 ft) before entering.
• Measure depth in inches, because stone depth is almost always specified in inches (2–4 in for walkways, 6–12 in for driveways).
• Add 10–15% extra for compaction and settling. Loose stone settles after being spread and rolled, so order a bit more than the raw calculation.
• For circular areas, use the formula Ï€ × radius² for area, then multiply by depth and divide by 27.

Common Mistakes and How to Avoid Them

The most frequent error is mixing units. If you enter length in feet but depth in inches without converting, your result will be off by a factor of 12. Always convert depth to feet (divide by 12) or use a calculator that does it for you, like the one above.

Another mistake is forgetting that a cubic yard is 27 cubic feet, not 9. Some people mistakenly divide by 9 (thinking of square yards). Double-check the division step.

A third error is ignoring the difference between volume and weight. A cubic yard of crushed stone weighs about 1.35 tons, but river rock can weigh 1.68 tons. If you order by weight, using the wrong density can lead to a short or excess delivery. Ask your supplier for the exact density of the specific stone you are ordering.

Stone Types and Their Densities

Not all stone is the same. The density depends on the rock type and how it is processed:

• Crushed stone (limestone/granite) – angular, compacted well, density around 1.35–1.55 tons/yd³
• Pea gravel – small, rounded, density around 1.4–1.5 tons/yd³
• River rock – larger, smooth, more air space, density around 1.6–1.7 tons/yd³
• Decomposed granite – fine, packs tightly, density around 1.4 tons/yd³
• Lava rock – porous and light, density around 0.9–1.1 tons/yd³

If you are unsure, ask the supplier for their bulk density. The calculator’s defaults are reasonable averages, but the exact number can vary by quarry and moisture content.

How to Use the Result When Ordering

Once you have the cubic yards and tons, call your supplier. They will typically ask: “How many tons?� or “How many yards?�. If they sell by the ton, give them the tons figure. If they sell by the cubic yard, give them the cubic yards. Always confirm whether the price includes delivery and whether there is a minimum order (often 1–2 cubic yards).

Also consider the depth you actually need. For a standard walkway, 2–3 inches of stone is enough. For a driveway that will bear vehicles, you need 4–6 inches of compacted stone base, often topped with a finer layer. For a French drain, you might need 12 inches or more. The calculator works for any depth, but the right depth depends on the project’s purpose.

Frequently Asked Questions

How many square feet does a cubic yard of stone cover?

It depends on depth. One cubic yard covers 324 square feet at 1 inch deep, 162 square feet at 2 inches, 108 square feet at 3 inches, and 81 square feet at 4 inches. To find it yourself, divide 324 by the depth in inches (e.g., 324 ÷ 4 = 81 sq ft).

How many tons is a cubic yard of crushed stone?

Typically 1.35 to 1.55 tons per cubic yard, depending on the stone type. Crushed limestone is often around 1.35–1.45 tons/yd³, while denser granite can be 1.5–1.6 tons/yd³. Always confirm with your supplier.

Should I order by the cubic yard or by the ton?

Whichever the supplier uses. Many sell by the ton, but some sell by the cubic yard. If you know the volume, you can convert to tons using the density. If you order by the ton, make sure the density matches your stone type.

How much extra stone should I order for compaction?

Add 10–15% to the calculated volume. Loose stone settles when compacted or after rain, so a 10×10 ft area at 4 inches deep might need 1.4 cubic yards instead of the calculated 1.23 to account for settling.

Can I use this calculator for river rock or mulch?

Yes, for any bulk material that is measured in cubic yards. For mulch, the weight is much lower (about 0.25–0.5 tons/yd³), so the tons output would not apply. Use the cubic yards result for mulch, and ignore the tons unless you change the density.

What if my area is triangular or circular?

For a triangle, multiply base × height × 0.5 for the area. For a circle, use π × radius². Then multiply by depth and divide by 27. You can enter the resulting cubic feet directly if your calculator allows, or break the shape into rectangles.

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in length | Length | ft | 10 | 0
in width | Width | ft | 10 | 0
in depth | Depth | in | 4 | 0
sel material | Material | Crushed stone=1.35, Gravel=1.44, River rock=1.68, Limestone=1.55
out cubic_yards | Cubic yards | yd³ | (length * width * (depth / 12)) / 27 | 2
out tons | Estimated tons | tons | cubic_yards * material | 2