Driveway Stone Calculator
Calculate the gravel and crushed stone tonnage needed to build a durable, well-draining driveway base.
Quick Answer
A gravel driveway needs about 4–6 inches of stone over a compacted base. Multiply length × width × depth in feet, divide by 27 for cubic yards, then multiply by about 1.5 for tons. A 40 × 12 ft driveway at 4 inches needs roughly 6 cubic yards (about 9 tons).
Driveway Stone Calculator Guide
Building or resurfacing a driveway requires a solid foundation of compacted aggregate. Our driveway stone calculator is designed to help homeowners and contractors determine the exact tonnage of crushed stone, gravel, or quarry run needed for a durable, long-lasting surface that can handle heavy vehicle traffic.
A standard gravel driveway should be between 6 and 12 inches deep, depending on the soil conditions and expected load. This often involves a 3-layer system: a sub-base of 4-inch angular stone, a middle layer of 2-inch crushed stone, and a top layer of #57 or pea gravel. This driveway aggregate calculator helps you estimate each layer to ensure proper drainage and prevent ruts.
To avoid common pitfalls like improper sloping or thin material layers, read our guide on driveway installation mistakes. For budget planning, we also offer a detailed breakdown of gravel driveway costs per yard.
Recommended Driveway Stone Depths — a typical gravel driveway uses 3 layers totaling 9–12 inches.
| Driveway Layer | Typical Depth | Recommended Stone |
|---|---|---|
| Base layer (sub-base) | 4–6 in | Larger #2 or 3-4 in crushed stone |
| Middle layer | 3–4 in | #57 stone (3/4 in) |
| Top / surface layer | 2–3 in | #411 or 3/8 in minus for binding |
| Single refresh layer | 2–3 in | 3/4 in crushed stone |
Two Things That Save a Gravel Driveway From Sinking
The figure above tells you how much stone to order, but most failed gravel driveways don't fail because of the stone — they fail because the stone sinks into the soil and ruts within a season. Two inexpensive materials prevent almost all of that. A woven geotextile fabric laid over the subgrade stops your aggregate from migrating down into mud, while a ground-stabilization grid locks the surface gravel in place so it doesn't scatter and wash out under tire traffic. Spend a little here and your base lasts years instead of months.
Woven Geotextile Driveway Fabric
Separates stone from soil so your base won't sink, rut, or pump up mud after rain.
Check Price on AmazonGravel Grid / Stabilizer
Locks surface gravel in honeycomb cells so it stays put instead of scattering under tires.
Check Price on AmazonThe product links above are affiliate links — at no extra cost to you.
Frequently Asked Questions
What is the best stone for a driveway?
The best material is an angular, interlocking crushed stone. #57 crushed stone is a popular choice for the top layer, while a larger #3 stone can be used for the initial sub-base for added stability.
How deep should a stone driveway be?
A total depth of 6-8 inches is recommended. This usually consists of a 4-6 inch sub-base of larger crushed stone, followed by a 2-3 inch top layer of smaller, more tightly packed stone.
How many tons of gravel for a 10x20 driveway?
For a 10ft x 20ft driveway with a 4-inch base, you will need approximately 4.5 to 5 tons of crushed stone. Use our calculator with your exact dimensions for a precise estimate.
Do I need to compact a stone driveway?
Absolutely. Compaction is the most critical step. You should compact the sub-base and each subsequent layer with a heavy roller or plate compactor to lock the stones together and create a solid surface.
How do I calculate for a circular driveway?
Calculate the area using the formula for a circle (πr²) or use our measurement calculator for custom shapes. Then, multiply the area by your desired depth to find the total cubic yards required.
Can I just dump gravel on dirt for a driveway?
This is not recommended. For a lasting driveway, you must remove the topsoil, lay down a geotextile fabric for stabilization and weed prevention, and then build your base in compacted layers.