Crushed Stone Calculator uses volume = area × depth, then converts cubic feet to cubic yards, pounds, tons, truck loads, and material cost using density, waste factor, and price per ton or cu yd.
This crushed stone calculator estimates the total tons, cubic yards, cubic feet, bulk weight, truck loads, and material cost for any rectangular, square, or circular project area. Enter your dimensions, select a depth, choose a stone type, and apply a waste factor — the calculator returns everything you need to place an accurate order.
The default material is 3/4 inch crushed stone at a density of 105 lb/ft³, which is the most common size for driveways, paver bases, and drainage applications. All other sizes — 1/2 inch, 3/8 inch, 1-1/2 inch, crusher run, and drainage stone — are also supported with their own density values.
How to Use the Crushed Stone Calculator
Fill in the fields from top to bottom. Each input is described below so you know exactly what to enter and why it matters.
Project Shape
Choose Rectangle for driveways, patios, and beds with straight edges. Choose Circle for round features — the calculator uses diameter and applies $\pi r^2$ internally. Use Known Area if you already have the square footage from a plan or survey.
Length, Width, and Diameter
Enter length and width in feet for rectangular areas. For circular projects, enter the diameter in feet. If you are using the known area mode, enter the total area in square feet directly.
Depth / Thickness
Enter the desired stone depth. You can enter in inches or feet — the calculator converts automatically. Most driveway and paver base applications use 3 to 6 inches. Drainage stone installations typically range from 6 to 12 inches depending on the drainage design.
Stone Size and Density
Select the stone type from the dropdown. Each type carries a preset density in lb/ft³ used to convert volume into weight and tons. If your supplier has published a different bulk density, use the Custom Density option to enter it directly.
Waste Factor
The default waste factor is 5%. This adds a buffer for material lost during spreading, compaction, slight depth inconsistencies, and uneven subgrade. Increase to 10–15% for irregular shapes or projects with significant grade variation.
Material Price and Price Unit
Enter a price per ton or per cubic yard depending on how your supplier quotes material. The cost result is optional — leave it blank if you only need quantity. Note that delivery, taxes, and installation labor are not included unless you add them manually.
Crushed Stone Calculator Formula
The calculator runs a chain of seven steps. Each step converts one unit into the next. Understanding the chain helps you verify results and adjust inputs with confidence.
Step 1 — Calculate Area
For rectangular projects, area is simply length multiplied by width:
$$\text{Area} = \text{Length} \times \text{Width}$$
Step 2 — Calculate Raw Volume
Depth must be converted to feet before multiplying. For example, 4 inches ÷ 12 = 0.333 ft. Then:
$$\text{Volume}_{ft^3} = \text{Area}_{ft^2} \times \text{Depth}_{ft}$$
Step 3 — Apply Waste Factor
The waste factor inflates the volume to account for real-world spread loss, compaction, and uneven subgrade. A 5% waste factor multiplies volume by 1.05:
$$\text{Final Volume} = \text{Volume}_{ft^3} \times \left(1 + \frac{\text{Waste \%}}{100}\right)$$
Step 4 — Convert to Cubic Yards
There are 27 cubic feet in one cubic yard. Many suppliers quote crushed stone in cubic yards, so this conversion is essential for comparing quotes:
$$\text{Cubic Yards} = \frac{\text{Cubic Feet}}{27}$$
Step 5 — Calculate Weight in Pounds
Weight depends on volume and the bulk density of the specific stone type. For 3/4 inch crushed stone at $105 \text{ lb/ft}^3$:
$$\text{Pounds} = \text{Cubic Feet} \times \text{Density}$$
Step 6 — Convert to Tons
Most aggregate suppliers in the US sell crushed stone by the short ton (2,000 lb). To convert:
$$\text{Tons} = \frac{\text{Pounds}}{2000}$$
Step 7 — Estimate Cost
If your supplier prices by ton:
$$\text{Cost} = \text{Tons} \times \text{Price per Ton}$$
If your supplier prices by cubic yard:
$$\text{Cost} = \text{Cubic Yards} \times \text{Price per Cubic Yard}$$
The key step most manual calculations miss is depth conversion. If you multiply square feet by inches instead of feet, your volume will be 12 times too large. Always divide your inch depth by 12 first.
3/4 Inch Crushed Stone Calculator
The 3/4 inch crushed stone calculator uses a default bulk density of approximately 105 lb/ft³. This value represents loosely consolidated, dry angular stone of that gradation. It is a reasonable default density for many loose, dry 3/4 inch crushed stone estimates.
Actual bulk density at your job site can vary. Wet stone is heavier than dry stone. Stone with fine dust from the crusher (sometimes called “dirty” stone) packs more tightly than clean-washed material. If your supplier has a published density spec, enter it in the custom density field for a more precise result.
3/4 Inch Crushed Stone Calculator — Tons
To find tons of 3/4 inch crushed stone: multiply your square footage by the depth in feet, apply your waste factor, then multiply by 105 and divide by 2,000. For a 200 sq ft area at 4 inches deep with 5% waste, the result is 3.68 tons — exactly as the default example shows.
3/4 Inch Crushed Stone Calculator — Yards
The same 200 sq ft × 4 in project yields 70.00 cubic feet after waste, which equals 2.59 cubic yards ($70 \div 27 = 2.59$). Use the cubic yard result when a supplier quotes volume-based pricing or when comparing against a delivery truck’s listed capacity.
Crushed Stone Calculator in Tons
Ordering by the ton is standard practice for bulk aggregate delivery in the United States. Quarries, landscape supply yards, and most aggregate suppliers sell crushed stone by the short ton. When you place a delivery order, you specify tons — so getting this number right prevents under-ordering or paying for excess material you do not need.
The ton calculation is relevant for:
- Driveway base layers — where 4 to 6 inches of compacted crushed stone is common for light-duty residential applications.
- Paver base — where 4 inches of compacted 3/4 inch or crusher run stone is placed beneath pavers.
- Drainage stone — where 6 to 12 inches of clean open-graded stone is used around drain pipes and French drains.
- Bulk aggregate orders — where suppliers have per-ton pricing and delivery minimums (commonly 3–5 tons).
The ton formula applied by this calculator:
$$\text{Tons} = \frac{\text{Cubic Feet} \times \text{Density (lb/ft}^3\text{)}}{2000}$$
Because density varies by stone type, always check which material you have selected before reading the tons result. Crusher run at 115 lb/ft³ produces meaningfully more tons than drainage stone at 100 lb/ft³ for the same volume.
Crushed Stone Calculator in Yards
Cubic yards describe the volume of stone, independent of its weight. Some suppliers — particularly those serving landscapers and garden centers — quote material by the cubic yard rather than by the ton. Cubic yard pricing is also common for smaller bagged or scoop orders.
Knowing cubic yards is useful for:
- Comparing quotes from different suppliers, one of whom quotes tons and another cubic yards.
- Estimating how many dump truck loads you need — a standard tandem dump truck carries approximately 10–14 cubic yards.
- Cross-checking a supplier’s stated coverage per yard against your calculated needs.
The conversion is:
$$\text{Cubic Yards} = \frac{\text{Cubic Feet}}{27}$$
Keep in mind: cubic yards measure loose delivered volume. After compaction, the settled depth will be less than the delivered depth. Plan for this if you need a specific finished depth after compaction.
Crushed Stone Calculator by Square Feet
Square footage alone does not determine how much crushed stone you need. The depth and the stone density are equally important. The same 100 sq ft area requires twice as much material at 4 inches as it does at 2 inches, and more material in tons at 115 lb/ft³ than at 100 lb/ft³.
The table below shows how volume and approximate tons scale with depth for a 100 square foot area using 3/4 inch crushed stone at 105 lb/ft³ and no waste factor:
To use these figures for a different area, scale proportionally. A 500 sq ft driveway at 4 inches would require approximately $1.75 \times 5 = 8.75$ tons before waste. Use the calculator above to get the precise number including your chosen waste percentage.
Crushed Stone Calculator for Driveways
A driveway crushed stone calculator is one of the most common uses for this tool. The quantity you need depends on the driveway’s length, width, intended base depth, and whether you are doing a single base layer or a multi-layer compacted system.
For estimating purposes, common residential driveway base applications use 4 to 6 inches of compacted base material. Deeper sections, soft soils, or heavier vehicle traffic may call for additional depth or engineered base design. The calculator’s Base Depth Check output flags whether your entered depth falls within typical base layer ranges for reference.
Important notes for driveway planning:
- Crushed stone compacts after installation. The delivered loose volume will settle to a smaller finished depth. Plan for this when setting your target depth.
- Deep base layers are often placed in two compacted lifts rather than a single deep pour. Each lift is compacted before the next is added. This affects your total volume calculation since you may order material in phases.
- Final driveway design — including depth, grading, drainage, and geotextile fabric use — depends on site-specific conditions. This calculator provides material quantity estimates, not engineering specifications.
- When comparing crushed stone from retailers or suppliers, verify whether the product is priced per bag, per ton, or per cubic yard, as all three are common depending on the source.
Circle and Round Area Crushed Stone Calculation
Round features — circular patios, tree rings, decorative garden beds, or round drainage sumps — require a different area formula. The calculator handles this automatically when you select the Circle shape mode and enter the diameter.
The area of a circle is:
$$\text{Area} = \pi \times \left(\frac{\text{Diameter}}{2}\right)^2$$
For example, a circular patio with a 12-foot diameter has a radius of 6 feet. Area $= \pi \times 6^2 = \pi \times 36 \approx 113.1$ sq ft. At 3 inches deep with 3/4 inch crushed stone (105 lb/ft³) and 5% waste, that works out to approximately 1.56 tons.
When using the circle mode, enter only the outer diameter. The calculator derives the radius and computes the area automatically before applying depth, density, and waste factor to produce the final tons and cubic yards result.
Crushed Stone Sizes and Density Assumptions
Each stone type in the calculator carries a distinct bulk density. The table below summarizes the values used, the typical best use for each size, and notes on variation:
Worked Example
The following example matches the calculator’s built-in default values exactly. Use it to verify that your inputs produce the expected outputs before scaling up to your actual project dimensions.
Inputs: 20 ft × 10 ft rectangle, 4 inches deep, 3/4 inch crushed stone at 105 lb/ft³, 5% waste factor, $35/ton.
To summarize: a 20 × 10 ft area at 4 inches deep with 5% waste requires 3.68 tons, 2.59 cubic yards, or 70.00 cubic feet of 3/4 inch crushed stone. Total weight is 7,350 lb and the material cost at $35/ton is $128.63. These are the exact outputs the calculator produces for these inputs.
Ordering Crushed Stone: Tons vs Cubic Yards
Crushed stone is sold in two ways depending on the supplier type: by the ton (weight-based) or by the cubic yard (volume-based). Understanding the difference prevents ordering errors when comparing quotes.
Tons depend on density and moisture content. If stone has been sitting in rain, it weighs more per cubic yard than dry stone. A ton of wet crusher run is less volume than a ton of dry crusher run. Quarries and aggregate suppliers that use a truck scale charge by the ton because the scale weight is definitive and verifiable.
Cubic yards describe space, not weight. A cubic yard of drainage stone and a cubic yard of crusher run occupy the same space but weigh very different amounts. Landscape yards that load material with a bucket loader and sell by the scoop often use cubic yards.
Practical steps before ordering:
- Confirm with your supplier whether the quote is per ton or per cubic yard.
- Ask for the stated bulk density so you can cross-check the calculator’s volume-to-ton conversion.
- Confirm delivery minimums — most bulk suppliers require 3 to 5 ton minimums for delivered orders.
- Ask whether the delivery price is included or separate, as truck fees can equal or exceed material cost for small orders.
Accuracy, Assumptions, and Limitations
This calculator is a material quantity estimator. It produces accurate results given accurate inputs, but several real-world variables affect how closely the estimate matches what you actually use on site.
Density Is Approximate
The density values in this tool — ranging from 100 lb/ft³ for drainage stone to 115 lb/ft³ for crusher run — are representative averages for loose, dry stone. Your actual delivery may weigh more if the stone is wet, or less if it is exceptionally clean and open-graded. For large projects where even a 5% weight variation has cost implications, request the specific bulk density from your supplier and enter it using the custom density field.
Compacted Depth vs Delivered Depth
Crushed stone compacts after installation. A 6-inch delivered loose depth may settle to 4.5–5 inches after compaction, depending on stone type and compaction equipment. If you are targeting a specific finished depth after compaction, calculate for a somewhat greater delivered depth and use the waste factor field to add buffer.
Waste Factor Purpose
The waste factor compensates for material lost during spreading, stones that roll beyond the border edge, compaction settlement, and uneven subgrade. A 5% factor is suitable for most projects with defined edges. Increase to 10–15% for projects with irregular shapes, significant elevation changes, or soft spots that will require more depth in certain areas.
Cost Estimate Scope
The cost output covers material only. Delivery fees, equipment rental, labor, geotextile fabric, edging, grading, and applicable taxes are not included unless you account for them separately. The price-per-ton or price-per-yard field accepts the all-in delivered material price if your supplier quotes it that way.
Not Engineering Design
This calculator provides material quantity estimates for planning and purchasing purposes. It does not perform structural or geotechnical engineering calculations. Driveway depth, base layer design, and drainage specifications for any given site depend on soil conditions, load requirements, freeze-thaw cycles, and other site-specific factors. For engineered installations, consult a qualified professional.
Frequently Asked Questions
How much 3/4 inch crushed stone do I need?
Multiply your area in square feet by the depth in feet ($\text{depth (in)} \div 12$), then multiply by the density (105 lb/ft³) and divide by 2,000 to get tons. Add a 5% waste factor. For a 200 sq ft area at 4 inches, you need approximately 3.68 tons. Enter your specific dimensions above and the calculator returns the exact figure.
How do I calculate crushed stone in tons?
Use the formula: $$\text{Tons} = \frac{\text{Area (ft}^2) \times \text{Depth (ft)} \times \text{Density (lb/ft}^3)}{2000}$$. Apply a waste multiplier (e.g., 1.05 for 5% waste) to the volume step before multiplying by density. This calculator runs all seven steps automatically.
How many cubic yards of crushed stone do I need?
Calculate your volume in cubic feet (area × depth in feet), apply the waste factor, then divide by 27. A 200 sq ft × 4-inch project with 5% waste produces 70.00 cubic feet ÷ 27 = 2.59 cubic yards. The calculator displays cubic yards directly alongside tons.
How much area does one ton of crushed stone cover?
At 105 lb/ft³, one ton of 3/4 inch crushed stone is approximately 19.05 cubic feet. At 2 inches deep, that covers about 114 sq ft. At 4 inches deep, about 57 sq ft. At 6 inches, about 38 sq ft. Coverage decreases as depth increases — coverage is inversely proportional to depth.
How much 3/4 inch crushed stone do I need for a driveway?
Measure the driveway length and width in feet. Enter those dimensions, select a depth (commonly 4 to 6 inches for a base layer), choose 3/4 inch crushed stone, and set a 5–10% waste factor. The calculator returns the total tons needed. A 100 ft × 12 ft driveway at 4 inches of 3/4 inch stone requires approximately 21 tons before waste — confirm in the calculator for your specific dimensions.
Is crushed stone calculated by square feet or cubic yards?
Both are part of the calculation. Square feet give you the area. Multiplying by depth in feet gives cubic feet. Dividing by 27 gives cubic yards. You need area (square feet) plus depth to get any quantity result — square footage alone tells you nothing about how much stone you need.
How do I calculate crushed stone for a circle?
Find the area using $\text{Area} = \pi \times (d \div 2)^2$. Then proceed with the standard volume and ton calculation. In the calculator, select the Circle shape, enter the diameter, and everything else is handled automatically. For a 10-foot diameter circle at 3 inches deep with 3/4 inch crushed stone, you need about 1.03 tons before waste or 1.08 tons with 5% waste.
What density should I use for 3/4 inch crushed stone?
The standard assumption is approximately 105 lb/ft³ for loose, dry 3/4 inch crushed stone. This is the calculator’s default. If your supplier provides a different bulk density — particularly for wet or mixed-gradation material — enter it in the custom density field for a more accurate result.
What is the difference between crushed stone tons and yards?
Tons measure weight. Cubic yards measure volume. The relationship between them depends on density. At 105 lb/ft³, one cubic yard (27 cu ft) of 3/4 inch crushed stone weighs about 2,835 lb, or 1.42 tons. Different stone types have different densities, so one cubic yard does not always equal the same number of tons.
How much waste should I add for crushed stone?
5% is suitable for most projects with defined edges and relatively level subgrade. Use 10% for projects with irregular shapes, curved edges, or soft spots. Use 15% for projects where the subgrade has significant variation in elevation or soil depth. The waste factor is a buffer, not a fixed rule — adjust it based on site conditions.
Can I use this as a driveway crushed stone calculator?
Yes. Enter the driveway length and width, set the depth to your base layer specification, select 3/4 inch crushed stone or crusher run, and apply a waste factor. The result gives you total tons and cubic yards for your order, along with an estimated material cost if you enter a price. The calculator also includes a base depth check output for driveway and paver base applications.
Can I use this for 1/2 inch or 3/8 inch crushed stone?
Yes. Both sizes are available from the stone type dropdown. The 1/2 inch crushed stone calculator uses a density of approximately 108 lb/ft³, and the 3/8 inch crushed stone calculator uses approximately 105 lb/ft³. Select the correct stone type and the density adjusts automatically, giving you accurate tons and cubic yards for either size.