Quarry Dust Calculator

What Is Quarry Dust?

Quarry dust is the fine material produced during the crushing and screening of stone in quarries. It is made up of stone fines, dust-sized particles, and very small crushed fragments that remain after larger aggregate sizes are separated.

Because of its fine gradation, quarry dust is commonly used as a fill material, leveling material, compactable base component, and in some construction mixes where a dense, tightly packed layer is needed.

Common Uses of Quarry Dust

Quarry Dust vs Sand vs Crusher Dust

In many markets, quarry dust and crusher dust are used almost interchangeably, but the exact gradation can vary by quarry and stone source.

How Quarry Dust Quantity Is Calculated

Quarry dust quantity is calculated using:

Volume = Area × Depth

The calculators above estimate the area for straight paths, curved paths, circular sections, and rectangular areas, then multiply that area by the selected depth. The result is converted into cubic yards, cubic feet, or cubic meters, and then into weight using density.

Quarry Dust Density and Weight

Quarry dust commonly falls around 1,600 to 1,800 kg/m³ depending on the source rock, moisture content, and how tightly the material is packed. A default density of 1,700 kg/m³ is a practical estimate for many quarry dust calculations.

If your supplier provides a specific bulk density or tons-per-yard figure, use the manual override for better accuracy.

Typical Quarry Dust Depth by Application

Why Quarry Dust Is Useful in Compacted Layers

Quarry dust contains fine particles that help reduce air gaps and create a tighter, denser layer when compacted. That makes it useful where a firm finish is needed, especially in light-duty paths, paving support layers, and leveling work.

However, because it is a fine material, it is generally not the best choice where free drainage is the main priority.

Important Tips When Using Quarry Dust

• Compact the material in layers for a firmer finish
• Use it for leveling and fine fill, not as a substitute for drainage stone
• Check local material gradation because quarry dust varies by source
• Add extra material for compaction and minor site adjustment
• Keep the surface slightly graded so water does not sit on finished areas

Where Quarry Dust Should Not Be Used

• Drainage trenches where open water flow is required
• French drains or pipe surround where clean stone is needed
• Projects needing a coarse structural aggregate instead of fine fill
• Applications where heavy mud formation is likely under persistent saturation

FAQs

What is quarry dust used for?

Quarry dust is commonly used for leveling, fine filling, pathway construction, paver support layers, and compacted surface finishes.

Is quarry dust the same as sand?

No. Quarry dust is a crushed stone byproduct, while sand is a naturally granular material. They may look similar in some cases, but they behave differently in construction.

Can quarry dust be used under pavers?

In some projects, yes. It can be used as a fine compactable layer, but suitability depends on the paving method and local material characteristics.

How much quarry dust should I order?

Ordering 5–10% extra is common to cover compaction, uneven surfaces, and small losses during spreading and finishing.

How much quarry dust do I need for a 10 by 20 foot area?

At 2 inches deep, length × width × depth ÷ 324 is 10 × 20 × 2 ÷ 324 = 1.23 cubic yards. The straight-path tool, left at 1,700 kg/m³, also shows 0.94 cubic meters, 1.77 short tons, and 1.60 tonnes. A 1 inch skim of the same pad is half of that, 0.62 cubic yards.

Add the 5–10 percent already recommended above if the grade is soft. The calculator itself does not hide that allowance in the formula.

How many bags of quarry dust are in a cubic yard?

One cubic yard is 27 cubic feet, so it is 54 bags of 0.5 cubic feet. The 10 by 20 foot example at 2 inches is 33.3 cubic feet, which is 67 of those bags. Most jobs this size are a bulk order, not a trunk full of bags.

If the bag is sold by the pound, divide the ton line by the bag weight. At 1.77 short tons the example is 3,538 pounds, or 71 bags of 50 pounds, rounded up.

How much does a yard of quarry dust weigh?

At the 1,700 kg/m³ starting density, one cubic yard weighs about 1.43 US tons (2,860 pounds) and 1.30 tonnes. Damp dust from a wet stockpile can sit higher. A dry, fluffed load can sit closer to 1.35 tons.

The tons line under the result is the short-ton figure. The “t” menu on the calculator is metric tonnes from the same kilograms.

How many square feet does a ton of quarry dust cover?

One cubic yard covers 324 square feet at 1 inch, 162 at 2 inches, and 108 at 3 inches. Divide those by 1.43 tons per yard and a ton covers about 226 square feet at 1 inch, 113 square feet at 2 inches, and 76 square feet at 3 inches.

A paver leveling layer is usually the thin end of that table. A compacted walking surface is the 2 to 4 inch row in the depth table above.

How deep should quarry dust be under pavers?

The depth table on this page puts a paver leveling layer at 1 to 2 inches. One inch over 200 square feet is 200 × 1 ÷ 324 = 0.62 cubic yards, about 0.88 short tons at 1,700 kg/m³. Two inches doubles both numbers.

That dust is the fine layer, not the structural base. The compacted gravel under it is a separate order, usually 4 to 6 inches, on the paver gravel calculator.

Can quarry dust be used as a driveway surface?

It packs into a tight cap, and it also turns to paste when it stays wet. A light farm lane sometimes uses a few inches over a thicker base. A driveway that carries daily traffic wants crusher run or crushed stone for the structure, with dust only as a thin finish if you want the smooth look.

Do not put it in a French drain or around a perforated pipe. The fines seal the voids the drain is there to keep open.