Crushed Stone Calculator
ConstructionCalculate how many cubic yards and tons of crushed stone you need to cover an area to a given depth. Enter length, width, and depth to get a quick estimate.
Crushed Stone Needed
3.33
Volume Needed
2.47
What is a Crushed Stone?
A Crushed Stone Calculator estimates how many cubic yards and tons of crushed stone you need to cover a given area at a specified depth. It converts your area's length, width, and depth into a volume in cubic feet, translates that into cubic yards, and then applies a stone density factor โ typically 1.2 to 1.6 tons per cubic yard โ to arrive at the tonnage you'll need to order.
Crushed stone is sold by weight, but planned coverage is naturally measured in area and depth, so this conversion is the key step most people get wrong when estimating a project by hand. The calculator handles it automatically, giving you a ready-to-order tonnage figure.
How to use this Crushed Stone calculator
- Enter the length of the area you're covering, in feet.
- Enter the width of the area, in feet.
- Set the depth of crushed stone you plan to spread, in inches โ 2 to 3 inches for walkways, 4 inches or more for driveways and drainage applications.
- Adjust the tons-per-cubic-yard value if your supplier has given you a specific density for their product; otherwise, the default of 1.35 works as a reasonable general-purpose estimate.
- Read the Crushed Stone Needed result in tons โ this is the figure to order from your supplier.
- Check the Volume Needed in cubic yards as a secondary reference, and consider ordering 5 to 10% extra to cover settling and uneven sub-grade.
Formula & Methodology
The calculator converts your area and depth into a volume, then applies a density factor to estimate weight: Step 1 โ Volume in Cubic Feet: > V = L ร W ร (D รท 12) Where: - V = volume in cubic feet - L = length in feet - W = width in feet - D = depth in inches, divided by 12 to convert to feet Step 2 โ Convert to Cubic Yards: > Y = V รท 27 Step 3 โ Tons Needed: > T = Y ร ฯ Where ฯ is the stone density in tons per cubic yard, typically 1.2 to 1.6 depending on the material. Worked example: For a 20 ft by 10 ft area at 4 inches deep, with a density of 1.35 tons per cubic yard: V = 20 ร 10 ร (4 รท 12) โ 66.7 cubic feet Y = 66.7 รท 27 โ 2.47 cubic yards T = 2.47 ร 1.35 โ 3.33 tons For structural applications such as driveway sub-bases or drainage systems that must meet a specific engineering spec, confirm depth and material requirements with a local contractor or engineer โ this calculator is intended for general planning and material budgeting, not code-compliant structural design.
Frequently Asked Questions
The calculator provides a reliable material-quantity estimate based on standard crushed stone density assumptions, typically 1.2 to 1.6 tons per cubic yard depending on stone size and compaction. Actual coverage can vary slightly based on the specific stone type and how tightly it settles, so ordering a small buffer is recommended for any project.
Most crushed stone weighs between 1.2 and 1.6 tons per cubic yard, with 1.35 tons per cubic yard being a common average for general-purpose crushed stone. Denser materials like crushed granite trend toward the higher end, while lighter aggregate blends trend lower.
A pedestrian walkway typically needs 2 to 3 inches of crushed stone over a compacted base, while areas with occasional vehicle traffic need 4 inches or more. Deeper applications, such as driveway sub-bases, often call for 6 inches or more depending on soil conditions.
Crushed stone is mechanically crushed and screened rock with angular edges that lock together well for stability, while gravel is naturally weathered rock with rounded edges. Crushed stone is generally preferred for structural applications like driveways and drainage, while gravel is often chosen for decorative or looser-fill uses.
Break the area into rectangular or triangular sections, calculate the length and width (or base and height for triangles) of each, and sum the individual areas before running the calculation. For curved or highly irregular beds, measuring the average length and width of a bounding rectangle gives a close enough estimate for most projects.
Yes, ordering 5 to 10% more than the calculated tonnage is standard practice to account for settling, uneven sub-grade, and minor spillage during spreading. Running short partway through a project typically costs more in a second delivery than simply over-ordering slightly up front.
Density depends on the stone's mineral composition, particle size distribution, and how well it compacts โ larger, more angular stones with a range of particle sizes typically compact denser than uniformly sized stones. Your supplier can usually provide the specific tons-per-cubic-yard rating for the exact product you're ordering.
Yes, the same length-width-depth formula applies to any crushed stone application, including garden beds, drainage trenches, and decorative ground cover. Just adjust the depth to match your project โ decorative applications often use 2 to 3 inches, while functional drainage layers may need more.
Crushed stone typically costs $25 to $65 per ton delivered, depending on stone size, region, and delivery distance from the quarry. Bulk orders and local pickup can reduce costs, while smaller bagged quantities from retail stores cost significantly more per ton equivalent.
A larger crushed stone, often labeled #3 or #4 stone, is commonly used for the base layer of a driveway because its angular shape interlocks and compacts well under vehicle loads. A finer top layer, such as crusher run or #57 stone, is often added on top for a smoother driving surface.
The calculator estimates the volume needed to fill the specified depth as delivered; it does not separately model post-installation settling. If your project requires a specific compacted depth, consider adding 10 to 15% extra depth to your input to account for typical settling under traffic or foot compaction.
Cubic yards measure volume, while tons measure weight โ crushed stone suppliers typically sell and deliver by weight (tons) because trucks are rated by load weight, not volume. This calculator computes the volume first, then converts it to tons using an average density factor so you can order confidently.
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