Calculate cubic yards, tons, and cost for your gravel driveway. Select a quick-fill preset or enter custom dimensions to get an instant material estimate.
A 100-foot driveway is one of the most common projects homeowners tackle. Here is exactly how to calculate gravel for a standard 100 × 12 ft driveway at 4 inches of depth.
The formula: Length (ft) × Width (ft) × Depth (in) ÷ 324 = Cubic Yards
Worked example: 100 × 12 × 4 ÷ 324 = 14.81 cubic yards
To convert to tons, multiply by the gravel density factor of 1.35: 14.81 × 1.35 = 19.99 tons (essentially 20 tons).
Always add 10% for compaction, uneven ground, and waste. That brings your order to approximately 16.3 cubic yards or 22 tons. Most suppliers deliver in full-yard or half-ton increments, so round up to 17 cubic yards or 22 tons when placing your order.
Here is a quick reference for common driveway sizes at 4 inches deep:
| Driveway Size | Cubic Yards | Tons | Estimated Cost |
|---|---|---|---|
| 30 × 10 ft | 3.70 | 5.00 | $150-225 |
| 50 × 10 ft | 6.17 | 8.33 | $250-375 |
| 50 × 16 ft | 9.88 | 13.33 | $395-595 |
| 100 × 12 ft | 14.81 | 20.00 | $590-890 |
| 100 × 16 ft | 19.75 | 26.67 | $790-1,185 |
| 150 × 12 ft | 22.22 | 30.00 | $890-1,335 |
Costs based on $40-60 per cubic yard for loose gravel. Actual prices vary by region and supplier.
A properly built gravel driveway is not just one type of stone dumped in a pile. It uses a layered system where each layer serves a specific purpose. This three-layer approach prevents rutting, improves drainage, and extends the life of your driveway by years.
The bottom layer is the structural foundation. Use crusher run (a mix of crushed stone dust and angular pieces up to 1.5 inches) or road base material. These angular particles lock together under compaction to form a rigid, load-bearing surface. This layer should be compacted with a plate compactor or roller after spreading.
The middle layer provides drainage and additional structure. #57 stone (approximately 1 inch in diameter) creates channels for water to flow through rather than pooling on the surface. Compact this layer firmly on top of the subbase.
The top layer is what you see and drive on. Pea gravel provides a clean, decorative finish, while #411 (a blend of stone dust and small crushed stone) packs down tightly for a smoother driving surface. Choose based on aesthetics and how firm you want the finished surface.
For a basic gravel project like a garden path, a single layer of 3-4 inches is fine. But driveways need this multi-layer approach to handle vehicle weight without deteriorating quickly.
The right depth depends on how much traffic your driveway handles and what type of vehicles use it. Insufficient depth leads to potholes, ruts, and gravel migrating into the soil below.
| Usage | Minimum Depth | Recommended Depth | Notes |
|---|---|---|---|
| Light traffic (1-2 cars) | 4" | 4-6" | Standard residential driveway |
| Moderate traffic (daily use) | 6" | 6-8" | Multi-vehicle household |
| Heavy traffic (trucks, trailers) | 8" | 8-12" | Use compacted subbase layer |
| Commercial / farm | 10" | 10-12" | Equipment-rated base required |
Depth measurements refer to the total compacted thickness of all layers combined. Loose gravel compacts by approximately 20-30%, so if you need 6 inches of compacted depth, spread about 8 inches of loose material. See our gravel depth guide for more detail on choosing the right depth for every project type.
Not all gravel works well for driveways. The best driveway gravel is angular (not round), packs together tightly, and stays in place under tire pressure. Here are the top choices:
| Gravel Type | Best Layer | Why It Works | Density (t/yd³) |
|---|---|---|---|
| Crusher Run | Subbase | Angular fines lock together; compacts extremely well | 1.50 |
| Road Base | Subbase | Engineered blend designed for load-bearing surfaces | 1.55 |
| Crushed Stone (#57) | Middle | Excellent drainage; angular pieces interlock | 1.35 |
| Gravel (loose) | Surface | Affordable, widely available, decent packing | 1.35 |
| Compacted Gravel | Any | Dense after roller compaction; durable | 1.55 |
Avoid using pea gravel or river rock as the only driveway material. Their round shapes shift under tires and create ruts. If you want a smooth, decorative surface layer, use pea gravel only on top of a compacted angular base. Learn more about material options on our types of gravel guide.
Budgeting for a gravel driveway involves more than just the stone. Here is a realistic breakdown of all costs involved, from raw material to finished surface.
| Cost Component | Price Range | Notes |
|---|---|---|
| Gravel (material only) | $30-60 / cu. yd. | Varies by type; crusher run is cheapest |
| Delivery | $50-150 | Depends on distance and load size |
| Grading / prep | $0.50-1.00 / sq. ft. | Clearing, leveling, drainage slope |
| Spreading / labor | $0.50-1.50 / sq. ft. | DIY saves this entire cost |
| Geotextile fabric | $0.15-0.30 / sq. ft. | Optional; prevents gravel sinking into soil |
| Edging / borders | $3-8 / linear ft. | Keeps gravel contained |
Total cost estimate: For a typical 50 × 10 ft single-lane driveway, expect to pay $300-600 for a DIY project (material + delivery) or $700-1,500 for professional installation. Use our gravel cost calculator to estimate your specific project.
For any driveway project, bulk delivery is almost always the better choice. Here is a direct cost comparison:
| Method | Unit Size | Cost per Cu. Yd. | Best For |
|---|---|---|---|
| Bags (0.5 cu. ft.) | ~54 bags per cu. yd. | $216-324 | Patches under 0.5 cu. yd. |
| Bulk delivery | 1+ cu. yd. per load | $30-60 | Any driveway project |
Bags make sense only for small repairs or topping off an existing driveway. At $4-6 per 0.5 cubic foot bag, you would spend over $200 per cubic yard compared to $30-60 for bulk. For a 6 cubic yard driveway, that is the difference between $200 and $1,300 for the same material.
Most landscape supply yards offer free or low-cost delivery for orders of 5 yards or more. Call ahead to confirm delivery fees and minimum order requirements.
For a 100 × 12 ft driveway at 4 inches deep: 100 × 12 × 4 ÷ 324 = 14.81 cubic yards, or about 20 tons. Add 10% extra for compaction and waste, bringing the total to roughly 16.3 cubic yards or 22 tons.
A gravel driveway should be 4-6 inches deep minimum for passenger vehicles, and 8-12 inches for heavy traffic or commercial use. This is typically built in three layers: 4-6 inches of crusher run base, 2-3 inches of compacted middle layer, and 1-2 inches of surface gravel.
The best driveway gravel system uses three layers: crusher run or road base for the bottom, compacted #57 stone for the middle, and #411 or pea gravel for the surface. Crushed angular stone locks together better than round gravel and provides a more stable driving surface.
A gravel driveway typically costs $1-3 per square foot, or $300-1,500 for a single-lane 50-foot driveway. This includes $30-60 per cubic yard for material, $50-150 for delivery, and $0.50-1.50 per square foot for professional installation if needed.
Buy in bulk for driveways. Bags cost $4-6 per 0.5 cubic foot ($216-324 per cubic yard), while bulk gravel runs $30-60 per cubic yard, making bulk up to 80% cheaper. Bags only make sense for small patch jobs under 0.5 cubic yards.
Enter your driveway dimensions in the calculator above or select a preset size to get an instant estimate for cubic yards, tons, and cost. No sign-up required.
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