How Much Gravel for a Driveway?
Quick Answer
A standard single-car driveway (12×40 ft) at 4-inch depth requires approximately 5.9 cubic yards or 8.3 tons of gravel. Double that for a two-car width.
- Single-car (12×40 ft, 4" deep): 5.9 cubic yards / 8.3 tons
- Two-car (20×40 ft, 4" deep): 9.9 cubic yards / 13.8 tons
- Base layer (6"): multiply by 1.5×
- Gravel driveways need 3 layers: base, middle, and surface
Formula
Calculate cubic yards using area × depth ÷ 324, then multiply by 1.4 tons per cubic yard (average gravel weight). Some gravel types weigh more.
Step-by-Step Calculation
- 1
Driveway area
12 × 40 = 480 sq ft
- 2
Cubic yards
480 × 4" ÷ 324 = 5.93 cubic yards
- 3
Convert to tons
5.93 × 1.4 = 8.3 tons
- 4
Full 3-layer driveway (12")
5.93 × 3 = 17.8 CY / 24.9 tons total
Gravel for Common Driveway Sizes (4" Depth)
| Driveway Size | Sq Ft | Cubic Yards | Tons | Material Cost* |
|---|---|---|---|---|
| 10×20 ft | 200 | 2.5 | 3.5 | $75–$175 |
| 12×40 ft | 480 | 5.9 | 8.3 | $180–$420 |
| 16×40 ft | 640 | 7.9 | 11.1 | $240–$555 |
| 20×40 ft | 800 | 9.9 | 13.8 | $300–$690 |
| 20×60 ft | 1,200 | 14.8 | 20.7 | $450–$1,035 |
*Gravel at $30–$50 per ton delivered. Prices vary by type and region.
Pro Tips
- A proper gravel driveway needs 3 layers: 4–6 inches of large crushed stone (#3 or #57) as a base, 2–3 inches of mid-size stone (#57 or #67) as a binder course, and 2–3 inches of fine gravel (#8 or crusher run) on top. Single-layer driveways develop ruts within one season.
- Compact each layer with a plate compactor ($60–$80/day rental) before adding the next. Without compaction, gravel settles 15–20% in the first year, creating potholes and drainage problems that require expensive regrading.
- Crown the center of the driveway 1–2 inches higher than the edges so water sheds to both sides. A flat gravel driveway becomes a water channel that erodes the surface stone and carries fines into the subgrade.
- For a standard 12×40 driveway (480 sq ft), plan to top-dress with 1–2 inches of fresh surface stone annually ($1.5–$2.5 per square foot) for the first 3 years. After that, the base stabilizes and annual topping is minimal.
Key Cost Factors
- A 3-layer gravel driveway (12×40 ft) uses about 12–15 cubic yards total (base + binder + surface). Crushed stone costs $20–$45/yard × 15 yards = $300–$675 for materials. Delivery adds $50–$150 per load (2–3 loads). Total materials and delivery: $450–$1,000.
- Professional gravel driveway installation runs $3–$7 per square foot ($1,440–$3,360 for a 12×40 ft driveway). The biggest cost variable is whether you need excavation of existing ground — removing 6 inches of topsoil and disposing of it adds $1.50–$3.00/sq ft ($720–$1,440).
- Compared to asphalt ($7–$13/sq ft) or concrete ($8–$15/sq ft), gravel at $3–$7/sq ft is 50–70% cheaper upfront. However, gravel requires annual maintenance that adds up — over 10 years, total cost of ownership for gravel approaches asphalt. The math flips for driveways longer than 100 feet.
Common Mistakes to Avoid
- Ordering one size of stone. A durable gravel driveway is layered — a coarse base rock, then a middle layer, then a fine crushed top. Using only decorative pea gravel creates a shifting, rutted surface.
- Skimping on depth. A gravel driveway needs 4–6 inches of compacted stone (more for the base). A thin 2-inch scatter quickly rutted and disappears into the soil below.
- Not compacting between layers. Dumping and spreading without compaction leaves a soft driveway that potholes fast. Each layer should be compacted with a plate compactor or roller.
- Forgetting the waste and compaction factor. Gravel compacts down roughly 20%, so order about 20% more loose volume than the finished dimensions suggest.
Related Project Considerations
- Build in a crown or slope. A gravel driveway should shed water off its surface with a slight center crown or cross-slope, or it will hold water, soften, and rut.
- Consider a geotextile fabric. Over soft or clay soils, a layer of woven geotextile under the gravel stops the stone from sinking into the mud and dramatically extends the driveway life.
- Plan for edge containment. Without a border of pavers, timbers, or a defined edge, gravel migrates outward into the lawn and needs constant raking back.
Frequently Asked Questions
What type of gravel is best for driveways?
Use #57 crushed stone (3/4 inch angular) for the top layer — it compacts firmly and drains freely. The base layer should be #3 stone (1–2 inches) for structural stability, with a middle layer of #57 or #67 stone. Avoid round river gravel or pea gravel for driveways — round stones do not interlock, so they shift under tires and create ruts. Angular crushed stone locks together and stays put.
How deep should a gravel driveway be?
A proper gravel driveway should be 12 inches deep total, built in three layers: 4–6 inches of large base stone, 3–4 inches of mid-size stone, and 2–4 inches of fine crushed stone on top. Minimum acceptable depth is 4 inches for light-use driveways on firm, well-drained ground. Skimping on depth leads to ruts, potholes, and mud showing through within a year — especially in areas with freeze-thaw cycles or clay soil.
How much does a gravel driveway cost vs concrete?
Gravel driveway: $1,500–$5,000 for a standard single-car drive, depending on length and depth. Concrete driveway: $4,000–$10,000 for the same footprint. Gravel is 50–70% cheaper upfront but needs annual topping and occasional regrading at $200–$500 per year. Over 20 years, the lifetime cost gap narrows significantly. Choose gravel for budget flexibility and easy DIY maintenance; choose concrete for lower long-term upkeep and a cleaner look.