Base quantity vs order quantity
The base quantity comes from area × depth × density. The order result adds the allowance you choose, so the extra material is visible instead of hidden in the math.
Crushed aggregate
Crushed stone calculator
Enter the area and finished depth to estimate crushed stone in tons and cubic yards. The result keeps the base quantity separate from an editable ordering allowance.
Gravel needed
—Enter area and depth to estimate gravel.
| Base quantity | — |
|---|---|
| Order weight | — |
| Order volume | — |
| Base volume | — |
| Allowance | — |
| Estimated cost | — |
Shopping list
Run the calculator to prepare a list.
Estimate only.
Gravel is sold by the (short) ton or cubic yard. Weights use approximate densities that vary
with stone size, moisture, and compaction — order about 5–10% extra for spreading and
settling, and confirm tonnage with your supplier.
Density is an assumption
This page uses 100 lb/cu ft as a representative loose density. A supplier's product-specific value or certified scale ticket is stronger evidence for the final order.
Approximate coverage per ton of crushed stone
These values use the same 100 lb/cu ft assumption and do not include an ordering allowance. Finished compacted coverage can be lower.
Where crushed stone is commonly used
Driveway and parking bases
Angular aggregate can interlock under compaction. A durable section may use more than one gradation and layer, so calculate each layer separately instead of treating the whole depth as one product.
Drainage and trench backfill
Drainage performance depends on gradation, fines, filter fabric, soil, and pipe design. Use the specified material rather than choosing only by size name.
Paver and hardscape base
Base material and finished compacted depth are project-specific. Do not substitute the loose delivery depth for the compacted design thickness.
FAQ
How much crushed stone do I need?
Multiply project area by depth to get volume, then apply the stone's loose bulk density. The calculator uses 100 lb per cubic foot as a visible representative crushed-stone assumption and reports both base quantity and an editable ordering allowance.
How much area does one ton of crushed stone cover?
At the calculator's representative density, one US short ton occupies about 20 cubic feet. That is roughly 120 sq ft at 2 inches, 80 sq ft at 3 inches, 60 sq ft at 4 inches, or 40 sq ft at 6 inches before allowance.
How many tons are in a cubic yard of crushed stone?
At 100 lb per cubic foot, one cubic yard weighs about 2,700 lb, or 1.35 US short tons. Actual supplier conversions vary with gradation, moisture, and compaction.
Is #57 stone the same as 3/4-inch crushed stone?
Names and gradation specifications vary by region and supplier. #57 commonly describes a graded crushed aggregate with particles around the 1/2- to 1-inch range, but confirm the product's exact specification and recommended use locally.
Should I add extra crushed stone to the calculated amount?
A 5–10% planning allowance is common for uneven grade, spreading, settling, and small measurement errors. Large fills, compacted bases, or irregular sites may need a different factor; ask the supplier or contractor.
Can I use pea gravel instead of crushed stone for a driveway base?
Rounded pea gravel moves more easily and does not interlock like angular crushed aggregate. Use a material and gradation approved for the base, drainage, and traffic conditions of your project.
Planning estimate only. Confirm crushed-stone type, loose or compacted density, depth, delivery minimum, and final tonnage with the supplier or project professional.