Crushed Stone Calculator
Estimate the volume, weight, order quantity, and material cost for a driveway, path, patio base, or landscape project.
Plan how much crushed stone to order
A crushed stone calculator estimates the material needed from the project area, finished depth, and approximate bulk density of the selected aggregate.
Enter the dimensions of a rectangular or circular area. The calculator converts the volume into cubic yards or cubic meters, estimates weight, adds an extra allowance, and rounds the order upward.
Calculate crushed stone quantity by multiplying length x width x depth to determine volume. For US measurements, convert cubic feet to cubic yards by dividing by 27.
Results remain hidden until you click Calculate Crushed Stone, so the page never shows a leftover estimate after inputs change.
Recommended order
Including the selected extra allowance
Area
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Volume
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Base weight
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Material cost
Not priced
Calculation breakdown
Measurements and conversions used in the estimate.
Order notes
Useful checks before contacting a supplier.
How to Use This Calculator
Measure the finished stone layer, then use these four steps.
1. Choose units and shape
Select US customary or metric units, then choose a rectangular or circular project area.
2. Enter finished dimensions
Enter length and width or diameter, plus the planned compacted depth of the stone layer.
3. Select the aggregate
Choose the closest stone type. Replace the preset bulk density with your supplier's figure when available.
4. Calculate and confirm
Click Calculate Crushed Stone, then confirm the recommended order, supplier rounding, price, and delivery capacity.
Crushed Stone Calculation Formula
The calculator finds volume first, then converts that volume into weight.
Rectangle area
Area = length x width.
Circle area
Area = pi x (diameter / 2) squared.
Volume and weight
Volume = area x depth. Weight = volume x bulk density.
Cubic-yard conversion and approximate weight
Divide cubic feet by 27 to convert the project volume to cubic yards. Crushed stone weighs approximately 2,400 to 2,700 pounds per cubic yard, depending on stone size and moisture content, so confirm the actual weight with the supplier when possible.
Interesting Fact
In 2025, the United States produced an estimated 1.5 billion tons of crushed stone valued at $27 billion. About 72% was used as construction aggregate, mostly for road construction and maintenance, while roughly 70% of production was limestone and dolomite. These figures come from the U.S. Geological Survey Mineral Commodity Summaries 2026.
Common Crushed Stone Depths
These are planning ranges, not project specifications. Soil, drainage, traffic, aggregate size, and local construction requirements can change the proper depth.
| Project | Planning depth | Important consideration |
|---|---|---|
| Decorative path or top layer | 2 to 3 in / 5 to 8 cm | Use enough depth to cover fabric and limit exposed low spots. |
| Patio or paver base | 4 to 6 in / 10 to 15 cm | Compact in lifts and follow the paver manufacturer's base guidance. |
| Residential driveway base | 6 to 12 in / 15 to 30 cm | Weak soil, heavy vehicles, and freeze-thaw conditions may require more. |
| Drainage trench or pipe bedding | Project-specific | Confirm pipe, drainage, and local code requirements before ordering. |
How to Choose the Right Crushed Stone
Stone size and gradation affect compaction, drainage, stability, and finish. Product names vary by region, so match the material description and intended use rather than relying only on a local nickname.
| Material type | Common uses | Behavior | Check before ordering |
|---|---|---|---|
| Dense-graded base or crusher run | Driveways, road base, patios, and paver foundations | Mixed particle sizes lock together and compact into a firm layer. | Confirm maximum stone size and fines content. |
| Clean angular stone | French drains, pipe bedding, and drainage zones | Open voids allow water movement but do not form a dense, smooth surface. | Ask whether the product is washed and free of excessive fines. |
| Screenings or stone dust | Thin leveling courses and jointing where the system allows | Fine texture grades easily but can hold water and is not a substitute for drainage stone. | Follow the paver or hardscape system specification. |
| Washed gravel or decorative stone | Walkways, planting beds, borders, and visible top layers | Provides a finished appearance; rounded products may shift more under traffic. | Check color, particle range, edging needs, and suitability for foot traffic. |
A structural base and a decorative surface often require different products. Calculate each layer separately when a project uses dense-graded stone below and a cleaner or more attractive aggregate above.
Source: U.S. Geological Survey: Crushed Stone Statistics and Information.
Compaction, Loose Depth, and Lift Planning
The calculator uses the finished depth you enter. Installation may require a thicker loose layer because aggregate settles as voids close during compaction.
Finished versus loose depth
Use the required compacted depth as the design target
Do not assume one universal compaction percentage. Moisture, gradation, equipment, subgrade, and placement method all affect how much loose material is needed. Use the extra allowance for planning, then confirm the loose-to-compacted relationship with the supplier or project specification.
Multiple lifts
Build deep bases in manageable layers
Thick base courses are commonly spread and compacted in more than one lift so the equipment can densify the full thickness. For example, a 6-inch finished base may be planned as two compacted 3-inch lifts, subject to the material and equipment requirements.
Prepare the subgrade
Remove soft spots and establish the required excavation depth and slope.
Spread evenly
Place a uniform lift rather than filling deep depressions in one pass.
Compact methodically
Use suitable equipment and moisture conditions for the chosen aggregate.
Verify grade
Check final elevation, cross-slope, drainage direction, and low spots before the next layer.
How to Measure Irregular and Multi-Area Projects
Curved driveways, flared entrances, paths, islands, and mixed-depth projects are more accurate when divided into smaller measurable zones.
| Area type | How to estimate it | Calculator workflow |
|---|---|---|
| L-shaped or stepped area | Split it into non-overlapping rectangles and measure each one. | Calculate every rectangle separately, then add the volumes or order weights. |
| Triangle or driveway flare | Use area = base x height / 2. | Enter a rectangle with the same base and height, then divide that result by two. |
| Curved path | Divide the route into short rectangular segments using the centerline length and average width. | Run each segment separately; shorter segments improve the estimate on tight curves. |
| Obstacles or unfilled islands | Calculate the full area, then calculate the excluded area. | Subtract the excluded volume before applying the extra allowance. |
| Different depths or materials | Treat every depth and aggregate as a separate zone. | Calculate each zone independently so density and allowance remain correct. |
Keep a short measurement list with the project sketch. Add unrounded zone volumes first when every zone uses the same material, then apply the allowance and supplier rounding to the combined order to avoid rounding each small section upward.
Worked Crushed Stone Example
A simple example shows how area, depth, and density become an order quantity.
Example project
20 ft x 10 ft patio base, 4 in deep
A project area measuring 20 feet x 10 feet x 4 inches deep requires approximately 2.47 cubic yards of crushed stone. The area is 200 square feet, and the calculated volume is about 66.7 cubic feet before dividing by 27.
Estimated order
About 3.3 short tons before extra material
Using a planning density of 1,600 kg/m3 gives roughly 3.3 short tons. Adding 10% and rounding to a quarter ton produces an order estimate of about 3.75 short tons.
Checklist Before Ordering Stone
A quick supplier check can prevent shortages, excess material, and delivery surprises.
Confirm the selling unit
Ask whether the supplier sells by short ton, metric tonne, cubic yard, scoop, bag, or truckload.
Verify density and size
Confirm the aggregate size, gradation, moisture condition, and supplier weight per yard before finalizing the quantity.
Plan the delivery location
Check truck access, overhead wires, soft ground, gates, turning space, and where the pile can be safely dumped.
Material questions
Frequently Asked Questions
Quick answers about volume, weight, compaction, depth, pricing, and supplier orders.
How does the crushed stone calculator work?
It calculates area from the project dimensions, multiplies area by depth to find volume, and then multiplies volume by the selected bulk density to estimate weight. The extra allowance and supplier rounding are applied last.
How much does one cubic yard of crushed stone weigh?
Weight varies with stone type, gradation, moisture, and compaction. Crushed stone commonly weighs approximately 2,400 to 2,700 pounds per cubic yard, but the supplier's actual weight-per-yard figure is better than a general rule.
How much extra should I order for a driveway, patio, or walkway?
Ten percent is a practical planning allowance for many straightforward projects and helps maintain full coverage across minor low spots. Increase it for irregular edges, uneven driveway excavation, uncertain measurements, settlement, or material that will be compacted significantly.
What depth should I enter for a paver base or stone layer?
Enter the finished compacted thickness you need, then use the extra allowance to account for site variation. For structural work, install the paver base in appropriate lifts and follow the project specification for loose thickness and required compaction.
How do cubic feet, cubic yards, and tons relate?
When a volume is measured in cubic feet, divide the total by 27 to express it in cubic yards. These units measure space, while tons measure weight, so the conversion depends on bulk density and can change with particle size, moisture, and void space.
Can I use this calculator for gravel, limestone, or drainage aggregate?
Yes. Choose the nearest preset or enter a custom bulk density. The geometric calculation is the same, but the weight estimate should match the exact limestone, granite, screenings, road-base product, or clean material intended for water flow.
How is the material cost estimated?
The calculator multiplies the rounded order weight by the price entered per short ton or metric tonne. Delivery, taxes, minimum-load charges, spreading, equipment, and labor are not included unless your supplier's unit price already includes them.
Why should I confirm the estimate with a supplier?
Suppliers know the actual bulk density, moisture, load limits, minimum order, and delivery method for the specific product. Their figures can turn a general planning estimate into a more accurate purchase quantity.
Disclaimer
This crushed stone calculator provides a planning estimate only. Actual material requirements vary with excavation accuracy, aggregate gradation, moisture, bulk density, compaction, settlement, subgrade condition, drainage, project shape, and supplier measurement practices.
Density presets and depth ranges are general values, not engineering specifications. Confirm the correct aggregate, base design, finished depth, compaction method, and load requirements with the project plans, product supplier, local authority, contractor, or qualified engineer where appropriate.
Cost results include only the material price entered. Delivery, fuel surcharges, taxes, minimum-load fees, equipment, excavation, geotextile, grading, spreading, compaction, drainage work, labor, and disposal may add substantial cost. Always confirm the final quantity, price, delivery access, and truck capacity before placing an order.
Last updated: June 15, 2026