Stone Dust Calculator for Tons, Cubic Yards, Bags, and Cost
Estimate stone dust for paver projects, compacted fills, walking paths, and leveling layers using U.S. construction units. This calculator converts dimensions into cubic feet, cubic yards, estimated tons, bag counts, truckload planning, and rough material cost so you can order with less guesswork.
Calculate Stone Dust Quantity
How This Stone Dust Estimate Works
The calculator first converts your dimensions into area and loose depth. It then calculates cubic feet and cubic yards using the standard construction relationship of 27 cubic feet per cubic yard.
Tonnage is estimated by multiplying cubic yards by the density setting you choose. Because screenings vary by rock source, gradation, and moisture, the density selector is adjustable instead of fixed to a single national value.
The tool also applies optional compaction and waste percentages. That helps when you need a loose-placement estimate but also want to see compacted depth and ordering contingency.
Stone Dust Field Reference
| Reference Item | Verified Value | Why It Matters |
|---|---|---|
| Cubic conversion | 27 cubic feet = 1 cubic yard | All stone dust volume estimates depend on this conversion. |
| Coverage at 1 inch | 1 cubic yard covers about 324 sq ft at 1 inch depth | Useful for thin leveling applications. |
| Coverage at 2 inches | 1 cubic yard covers about 162 sq ft at 2 inches depth | Helpful for light fines build-up and resurfacing. |
| Coverage at 4 inches | 1 cubic yard covers about 81 sq ft at 4 inches depth | Common planning depth for compacted fines fill. |
| Coverage at 6 inches | 1 cubic yard covers about 54 sq ft at 6 inches depth | Useful for deeper low spots or shoulder build-up. |
| Typical screenings size | About 1/4 inch down to fine dust | Explains why the material compacts tightly. |
| Screenings threshold | Fine fraction after separation on a No. 4 sieve, 4.75 mm | Useful for understanding the material definition. |
Where Stone Dust Fits, and Where It Does Not
Stone dust, also called screenings, is the fine fraction left after crushed stone processing. FHWA describes screenings as the finer material separated during production, and Maryland guidance describes stone dust or #10 screenings as crushed particles from roughly 1/4 inch down to fine dust.
That makes stone dust useful for compacted fill, fine grading, and traction applications. Maryland specifically notes structural fill and icy-condition traction as common uses, while FHWA notes potential use in base-related applications if properly blended.
Paver bedding is a different question. Multiple interlocking pavement technical references say the bedding layer should conform to ASTM C33 sand gradation and state that stone dust or waste screenings should not be used as the bedding sand layer.
If your project is a paver system, use this calculator for fines volume planning only, not as proof that screenings are an acceptable bedding material. For paver assembly planning, also review the paver calculator, the base material calculator, and the sand calculator.
Sample Calculations
Walkway Fines Example
Length: 24 ft
Width: 4 ft
Loose depth: 2 in
Density assumption: 1.40 tons/cu yd
Volume = 0.59 cu yd, Tonnage = about 0.83 tons
The area is 96 sq ft. Depth is 2/12 = 0.167 ft. Volume is 96 × 0.167 = about 16.0 cu ft, then 16.0 ÷ 27 = about 0.59 cu yd. At 1.40 tons per cubic yard, that gives about 0.83 tons before waste.
Compacted Fill Example
Length: 18 ft
Width: 12 ft
Loose depth: 4 in
Waste factor: 7%
Base volume = 2.67 cu yd, Order quantity = about 2.86 cu yd
The area is 216 sq ft. Depth is 4/12 = 0.333 ft. Volume is 216 × 0.333 = about 72 cu ft, which is 72 ÷ 27 = about 2.67 cu yd. Adding 7% overage gives about 2.86 cu yd to order.
Frequent Estimating Mistakes
Using excavation dimensions instead of finished material dimensions. Stone dust is ordered to placed thickness, not raw overdig.
Ignoring compaction. Screenings tighten up after wetting, grading, and rolling, so loose depth and compacted depth are not the same.
Using one national density value for every quarry. Material properties vary by rock source, so ticket weight should control procurement.
Assuming stone dust is always suitable under pavers. ICPI-aligned documents commonly require ASTM C33 bedding sand instead.
Skipping waste on irregular edges, curves, and grade correction. Small hardscape jobs often need overage even when the volume seems minor.
Ordering Context and Related Planning
If your supplier sells by ton, compare the tonnage result with your haul limit and truck size. If your supplier sells by yard, use the cubic-yard result first, then verify how that quarry converts yards to tons on the delivery ticket.
For layered hardscape assemblies, stone dust is only one part of the section. You may also need the crushed stone calculator, the subbase calculator, the road base calculator, or the excavation calculator for the layers below.
If your project is cost-driven, compare fines quantity with the project budget calculator and the excavation cost calculator. For drainage-adjacent installations, check the French drain gravel calculator because fines and drainage aggregate are not interchangeable.
Stone Dust Calculator FAQ
Stone dust, also called screenings, is the fine material left after crushed stone processing. FHWA defines screenings as the fine fraction separated after crushing and screening, and Maryland guidance describes stone dust or #10 screenings as particles from about 1/4 inch down to fine dust.
Multiply area in square feet by depth in feet to get cubic feet, then divide by 27. That is the standard conversion used by stone and aggregate estimators.
Coverage depends on depth. One cubic yard covers about 324 sq ft at 1 inch, 162 sq ft at 2 inches, 108 sq ft at 3 inches, 81 sq ft at 4 inches, and 54 sq ft at 6 inches.
Not as the standard bedding sand layer in most interlocking concrete pavement assemblies. Technical references aligned with ICPI guidance commonly specify ASTM C33 bedding sand and state that stone dust or waste screenings should not be used for bedding.
Use your supplier's verified tonnage rate whenever possible. This calculator offers adjustable density because FHWA notes quarry by-product properties vary by rock source, and published compacted density values for screenings are not readily available in one universal table.
Usually no, not where free drainage is needed. Fine particles compact tightly and can restrict water movement. Maryland guidance explicitly says stone dust is not acceptable as a filter media.
Sources and Methodology
- Inch Calculator, Stone Calculator, volume and tonnage formulas, cubic yard conversion, accessed for dimensional methodology.
- Kokosing Aggregates Tonnage Calculator, cubic yard formula using feet-based dimensions.
- KL Supplies Material Calculator, reference coverage by depth, including 1, 2, 3, 4, 6, and 12 inch examples.
- FHWA-RD-97-148, Quarry By-Products, screenings definition, availability, moisture, and variability by rock source.
- Maryland Guide to Common Construction Materials and Components, stone dust or #10 screenings description and application limits.
- AASHTO M 147 overview, specification scope for screenings and dense graded materials used in base, subbase, and surface courses.
- Unilock / ICPI technical specification, ASTM C33 bedding sand requirement and instruction not to use screenings or stone dust as bedding.
- ICPI construction specification reference, bedding sand requirement and exclusion of stone dust or waste screenings.
Method note: This calculator uses geometric volume, converts cubic feet to cubic yards by dividing by 27, then estimates tons using an adjustable density input. Field ticket weights and supplier gradation data should override any default setting shown here.
Disclaimer
This calculator provides estimates for planning purposes. For permitted structural work, foundations, multi-story construction, retaining walls over 4 feet, and commercial projects, calculations must be verified by a licensed structural engineer per IBC 2024 §1604. ConcreteCalculate.com is not liable for structural decisions made from these estimates.
Privacy Note
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