Gravel Driveway Calculator
Enter your driveway's length, width and depth to get the tons and cubic yards of gravel you need, by material.
Most driveways use 4–6 inches of crushed stone or road base for the structural layer. Density varies by material — adjust above.
How to Estimate a Gravel Driveway
The calculator multiplies driveway area (length × width) by depth to get cubic feet, converts to cubic yards, then multiplies by your material's density to estimate weight in tons.
tons = cubic yards × material density
Worked example: a 50 ft × 12 ft driveway at 4 inches deep is 600 sq ft × 0.33 ft = 200 cubic feet, or about 7.4 cubic yards — roughly 11.1 tons of crushed stone. Add 5–10% for compaction and uneven subgrade, and for long driveways order in bulk by the ton — most suppliers deliver by dump truck and price per ton rather than per bag. For a dollar estimate, run your tons through the gravel cost calculator.
Recommended Driveway Layers
A driveway built to last isn't one layer of gravel — it's usually three, each doing a different job. Skipping straight to a single top layer is the most common reason gravel driveways rut, pothole, and sink into the ground within a year or two.
| Layer | Material | Depth | Purpose |
|---|---|---|---|
| Subbase | Crushed stone or road base | 4–6 in | Drains water away from the subgrade and creates a stable foundation |
| Base course | #57 crushed stone (3/4"–1") | 2–4 in | Compacts into a load-bearing layer that resists rutting under vehicle weight |
| Surface course | Pea gravel or #411 limestone screenings | 1–2 in | Finished, walkable/drivable top layer |
A full three-layer build runs 7–12 inches total. Many light-use driveways combine the subbase and base course into one 4–6 inch crushed stone layer (what the calculator above assumes by default) topped with a thin decorative surface course.
Driveway Depth Guide
Depth needs scale with how much weight the driveway carries. A light-use path to a shed or garden gate can get by with 4 inches total. A standard car driveway wants the full subbase-plus-base combination — 6–8 inches compacted. Anything carrying trucks, RVs, or regular heavy loads should go to 8–12 inches, ideally with a geotextile fabric under the subbase to stop the gravel from working its way into soft soil over time. See the full gravel depth guide for depth recommendations across every project type, not just driveways.
If you don't have exact measurements yet, these common driveway sizes give a rough starting point at a 4-inch base depth using crushed stone (1.5 tons/yd³) — plug in your own numbers above for an exact figure.
| Driveway | Typical size | Cubic yards | Tons |
|---|---|---|---|
| Single-car | 10 ft × 20 ft | ≈2.5 yd³ | ≈3.7 tons |
| Double-car | 20 ft × 20 ft | ≈4.9 yd³ | ≈7.4 tons |
| Long / rural (12 ft wide) | 12 ft × 100 ft | ≈14.8 yd³ | ≈22.2 tons |
Best Gravel Types for Driveways
Most gravel driveways use two visible layers on top of the compacted subgrade. The structural layer is crushed stone or road base (crush and run) — angular, machine-broken material that locks together when compacted, giving the driveway structure and drainage. A thinner 1–2 inch decorative top layer, often pea gravel or a colored landscape gravel, sits on top for looks and easier raking. The material dropdown above switches density between these options so your tonnage stays accurate whichever you're ordering. See the types of gravel guide for a full size and use comparison, or the pea gravel calculator if you've already settled on pea gravel as your surface course.
Cost Breakdown
Crushed stone and road base for the structural layers typically run $25–$50 per ton; decorative surface materials like pea gravel or colored gravel run $40–$85 per ton. A 600 sq ft single-car driveway at a combined 6-inch depth (base + surface) lands around 11–12 tons total, so a rough all-in material cost is $350–$700 before delivery. Delivery is usually billed separately by the load, and most suppliers set a minimum order (often 2–5 tons) before dispatching a truck. For an exact number based on your dimensions and local pricing, run your tons through the gravel cost calculator.
Frequently asked questions
How deep should gravel be on a driveway?
A typical gravel driveway uses 4–6 inches of base material (crushed stone or road base), sometimes with a thinner 1–2 inch decorative top layer.
How many tons of gravel do I need for a driveway?
It depends on your dimensions. A 50 ft × 12 ft driveway at 4 inches deep needs roughly 8.2 cubic yards, or about 12 tons of crushed stone. Use the calculator above for your exact numbers.
What's the best gravel for a driveway base?
Crushed stone or road base (crush and run) compacts well and is the standard structural layer. Pea gravel or decorative gravel is often added as a thinner top layer for looks.
Do I need more than one layer of gravel?
For anything more than a short, light-use path, yes — a compacted crushed stone or road base layer gives the driveway structure, and a thinner decorative top layer (pea gravel or landscape gravel) sits on top. Skipping the base layer is the most common reason gravel driveways rut and sink.
What's the difference between subbase, base course and surface course?
Subbase is the bottom layer of larger crushed stone or road base that drains water and stabilizes the ground. Base course sits above it — typically #57 crushed stone — and compacts into the load-bearing layer. Surface course is the thin, finished top layer, often pea gravel or fine limestone screenings, that you actually see and walk on.