3/4 Inch Crushed Stone Calculator and Coverage Formula

This 3/4 inch crushed stone calculator estimates the volume and weight of stone needed from your project’s length, width, and depth. Enter dimensions in feet and depth in inches; the calculator returns cubic yards and an approximate tonnage to help plan an order.

Formula

Volume in cubic yards = length × width × (depth ÷ 12) ÷ 27. Approximate weight in US short tons = length × width × (depth ÷ 12) × bulk density ÷ 2,000. Here, length and width are in feet, depth is in inches, bulk density is in pounds per cubic foot (lb/ft³), 27 is the number of cubic feet in a cubic yard, and 2,000 pounds equal one US short ton.

The density input is an estimate rather than a guaranteed property of every 3/4-inch crushed stone product. Stone type, grading, moisture, and how tightly it settles affect bulk density. Replace the default with a supplier’s stated bulk density when available; otherwise treat the tonnage as a planning estimate and confirm order quantities with the supplier.

Worked Example

Using the defaults—10 ft long, 10 ft wide, 4 in deep, and 100 lb/ft³ density—first convert depth: 4 ÷ 12 = 0.3333 ft. The area is 10 × 10 = 100 ft², so volume is 100 × 0.3333 = 33.3333 ft³. Divide by 27: 33.3333 ÷ 27 = 1.2346 yd³, which rounds to 1.23 yd³.

For approximate weight, multiply 33.3333 ft³ by 100 lb/ft³ to get 3,333.33 lb. Divide by 2,000 lb per US ton: 3,333.33 ÷ 2,000 = 1.6667 US tons, or 1.67 US tons rounded to two decimal places.

What the Calculator Covers

The calculator works for a simple rectangular area with a consistent stone depth. It gives a geometric volume and a mass estimate; it does not identify a particular quarry product, calculate a delivered truckload, or account for unusual site conditions. It is useful for paths, small patios, drainage beds, and other areas where 3/4-inch crushed stone is spread at a fairly even thickness.

“3/4 inch” describes a nominal stone size, not the depth of the layer. Enter the planned layer thickness in the depth field. For example, a 4-inch layer of 3/4-inch crushed stone means the material is about 4 inches deep, even though individual pieces are nominally about 3/4 inch across.

How to Use the Result

Use the cubic-yard result to compare the calculated volume with the unit in which your supplier sells or quotes aggregate. One cubic yard is 27 cubic feet, or about 0.765 cubic metres. If you work in metric, convert all dimensions consistently: volume in cubic metres is length in metres × width in metres × depth in metres. Do not enter metric values into fields labeled in feet or inches.

The tonnage output is an approximate US short-ton weight. A metric tonne is 1,000 kg, while a US short ton is 2,000 lb, or about 907.2 kg; these are not interchangeable. The density field is in lb/ft³, so a density given in kg/m³ must be converted before entry: divide kg/m³ by 16.0185 to get lb/ft³. For example, 1,600 kg/m³ is about 99.9 lb/ft³.

For an irregular area, divide the project into rectangles, calculate each one, and add the volumes. For a circular area, use its area (π × radius²) and multiply by depth after converting the depth to the same length unit. If the ground is uneven, estimate average depth from several measurements rather than using the deepest point for the entire area.

How to Choose

Choose the inputs that match the actual area and intended finished layer. Measure length and width at the edges where stone will stop, and decide whether your specified depth is the loose placement depth or the desired depth after compaction. The calculator treats depth as a uniform geometric thickness and does not add extra material for settling, spillage, or low spots.

For the weight estimate, the most important choice is bulk density. A default of 100 lb/ft³ is a workable illustrative estimate, but crushed stone can vary; ask the supplier for the product’s bulk density or a volume-to-weight conversion if precision matters. If you only need a volume estimate, you can use the cubic-yard result without relying on the tonnage figure.

Consider the material specification separately from the arithmetic. “3/4 inch crushed stone” can refer to different gradations and stone types, and some products include smaller particles while others are more uniformly sized. Confirm the product description and whether it suits your project before ordering; this calculator estimates quantity, not drainage performance, compaction behavior, or suitability for a particular base.

Common Mistakes and Limitations

A frequent error is entering depth in feet even though the field asks for inches, or entering a 4-inch depth as 4 feet. Another is confusing cubic yards with tons: volume measures space, while weight depends on density and moisture. Keep units consistent and avoid rounding each intermediate step; round only the final displayed result.

The rectangular formula assumes a level-sided area and uniform depth. It does not include a waste allowance, compaction factor, subgrade settlement, or the shape of individual stones. Add any project-specific allowance separately, and verify the final order quantity with the supplier. The displayed tonnage should not be treated as an exact shipping weight.

Frequently Asked Questions

How much area does one cubic yard of 3/4-inch stone cover?
It depends on depth. At 4 inches, one cubic yard (27 ft³) covers 27 ÷ (4/12) = 81 ft² before allowances for uneven ground or placement loss.

How many tons are in a cubic yard?
There is no single exact conversion because bulk density varies. At the calculator’s illustrative 100 lb/ft³, one cubic yard weighs 27 × 100 = 2,700 lb, or 1.35 US short tons.

Is 3/4-inch stone the right depth for my project?
The size designation is not a recommended layer depth. Choose depth based on the project design and site requirements, then enter that thickness; the calculator does not prescribe a construction specification.

Should I include extra material for compaction or waste?
The formula reports the exact geometric volume for the dimensions entered and includes no extra allowance. If the material will settle, the ground is irregular, or handling may cause losses, determine an appropriate project allowance separately with the supplier or installer.

Can I calculate a driveway with this tool?
Yes, if you can represent it as one or more rectangular sections with a reasonably uniform depth. Split curved or irregular layouts into smaller measured sections, calculate each, and add their volumes.

Final Thoughts

Enter the project dimensions in the stated units to estimate cubic yards, then use density only as a guide for approximate weight. Accurate measurements and a product-specific density from the supplier make the estimate more useful, while the result remains a quantity calculation rather than a recommendation about material or construction design.

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in length | Length | ft | 10 | 0
in width | Width | ft | 10 | 0
in depth | Depth | in | 4 | 0
in density | Bulk density | lb/ft3 | 100 | 0
out yards | Stone volume | yd3 | length * width * (depth / 12) / 27 | 2
out tons | Approximate stone weight | US ton | length * width * (depth / 12) * density / 2000 | 2