Typical: 1–2 in for leveling, 4–6 in for base fills.
Calculate how much stone dust you need for paver bases, patios, and walkways. Learn formulas for cubic yards, tons, bags, depth rules, compaction, and cost estimation.
A stone dust calculator (or aggregate screening calculator) estimates the total volume, weight (tonnage), and cost of stone dust needed for project applications like paver base leveling, patio subgrades, and walkways.
Planning a landscaping or hardscaping project requires getting your material quantities right before breaking ground. Whether laying a smooth leveling layer for a stone patio, setting brick pavers along a walkway, or filling gaps between flagstones, calculating your material needs prevents mid-project store runs and avoids leaving piles of unused aggregate on your driveway.
This stone dust calculator guide details how to convert site dimensions into exact volume, weight in tons, and bag counts, while accounting for compaction settling and material loss.
Stone dust—also known as stone screenings, rock dust, or granite fines—is a byproduct of crushing larger stone at quarries. It consists of pulverized rock particles ranging from tiny dust particles up to 1/4-inch chips.
When spread and compacted, stone dust forms a dense, non-porous surface that resists shifting. Its primary uses in landscaping and construction include:
A stone dust calculator is an estimation methodology or online tool that converts two-dimensional surface measurements (length and width) and layer depth into 3D volume (cubic feet and cubic yards) and physical mass (tons or bags).
The calculator operates through a standardized 4-step mathematical process:
Bulk stone dust and crushed aggregate are weighed and sold by the ton or metric tonne.
Loose Stone Dust Density: Approximately 100 lbs per cubic foot (about 1,600 kg/m³ or 1.35 US short tons per cubic yard).
Compacted Stone Dust Density: Approximately 115 to 125 lbs per cubic foot (about 1.55 to 1.7 tons per cubic yard).
Using the correct thickness prevents subgrade shifting and water trapping beneath pavers.
Theoretical formulas assume a flat, rigid container. Real-world aggregate applications involve compaction settling and site losses.
Project Scenario: A homeowner is building a backyard patio measuring 20 feet long by 15 feet wide (300 sq ft) and needs a 1-inch compacted stone dust setting bed over a prepared base.
Ordering Decision: Round up to order 1.5 Tons in bulk, or 55 Bags of 50 lbs each.
Estimates based on a standard loose density of 100 lbs/cu ft (1.35 tons per cu yd) before compaction:
| Surface Area | 1" Depth (cu yd) | 1" Depth (Tons) | 2" Depth (cu yd) | 2" Depth (Tons) | 50 lb Bags (1") |
|---|---|---|---|---|---|
| 50 sq ft | 0.15 cu yd | 0.21 Tons | 0.31 cu yd | 0.42 Tons | 10 Bags |
| 100 sq ft | 0.31 cu yd | 0.42 Tons | 0.62 cu yd | 0.84 Tons | 20 Bags |
| 200 sq ft | 0.62 cu yd | 0.84 Tons | 1.23 cu yd | 1.67 Tons | 40 Bags |
| 300 sq ft | 0.93 cu yd | 1.25 Tons | 1.85 cu yd | 2.50 Tons | 55 Bags |
| 500 sq ft | 1.54 cu yd | 2.08 Tons | 3.09 cu yd | 4.17 Tons | 92 Bags |
| 1,000 sq ft | 3.09 cu yd | 4.17 Tons | 6.17 cu yd | 8.33 Tons | 184 Bags |
Quantities include a 5% waste/compaction buffer. Actual required weights vary based on moisture and local stone origin.
While standard patio leveling follows basic formulas, consult a licensed hardscape contractor or geotechnical engineer if your project involves:
One short ton of stone dust (approx. 20 cu ft) covers:
For the leveling layer over a crushed stone base, both stone dust and coarse concrete sand work well. Stone dust packs tighter and creates a firm, rock-hard bed, while concrete sand offers slightly better water drainage. Note: For interlocking concrete pavers, ICPI and ASTM C33 specify washed concrete sand, not stone dust.
One ton of dry loose stone dust equals approximately 0.74 cubic yards (or 1 cubic yard weighs roughly 1.35 tons).
Professional Disclaimer: This guide provides theoretical material projections for preliminary planning and estimating purposes only. Actual material requirements, densities, and costs may vary based on local quarry specifications, moisture content, site conditions, and compaction achieved. Always verify quantities with your local aggregate supplier and consult a qualified hardscape contractor before placing final material orders.
Use our free stone dust calculator to get instant cubic yards, tons, and bag estimates for your paver base, patio, or walkway project.
Open Stone Dust Calculator →This calculator uses standard conversion factors and typical material density values. Actual density may vary depending on the quarry, moisture content, and degree of compaction.
Industry reference for aggregate proportions, yields and unit weights.
Safety guidance for excavation, material handling and site work.
Federal guidance on aggregate base layers, compaction and subgrade preparation.
One short ton of stone dust (approximately 20 cubic feet) covers about 240 sq ft at 1 inch deep, 120 sq ft at 2 inches deep, or 80 sq ft at 3 inches deep. Coverage depends on whether the material is loose or compacted, so always use the loose figure when ordering since that is the state it arrives in.
One ton of dry loose stone dust equals approximately 0.74 cubic yards. Put the other way, one cubic yard of loose stone dust weighs about 1.35 US short tons (roughly 2,700 lbs). Compacted in place, the same cubic yard rises to around 1.7 tons.
For the leveling layer over a compacted crushed stone base, both stone dust and coarse concrete sand work. Stone dust packs tighter and creates a rock-hard bed, while concrete sand drains slightly better. However, for interlocking concrete pavers, ICPI and ASTM C33 specify washed concrete sand — not stone dust — because the fine particles in stone dust hold water and can cause efflorescence, frost heave, and premature joint failure.
Use a maximum of 1 inch (25 mm) of compacted stone dust as the leveling bed, laid over a 4 to 6-inch compacted crushed stone base. Never exceed 1 inch — thicker stone dust layers hold water, heave in freeze-thaw cycles, and cause pavers to shift out of alignment.
Multiply length × width in feet to get the area, then multiply by depth in feet (inches ÷ 12) to get cubic feet. Divide cubic feet by 27 to convert to cubic yards, then multiply by 1.35 to estimate tons. Always add a 5% to 10% waste buffer for compaction and edge handwork. Our stone dust calculator runs all of this automatically.
Bulk stone dust typically costs $20 to $45 per ton at local quarries or aggregate yards. Bagged stone dust runs $3.50 to $6.00 per 50 lb bag, which is roughly $140 to $240 per ton equivalent. Delivery adds a flat fee of $50 to $150 depending on distance. Bulk is far more economical for projects over half a ton.