Gravel Driveway Calculator
Enter your driveway dimensions, base and surface layer depths, and waste factor to calculate cubic yards, tons, and estimated cost of gravel for your driveway project.
Estimate only — not professional advice. Always verify results independently before purchasing materials or beginning work. Terms of Use
What is Gravel Driveway?
A gravel driveway calculator estimates the total volume, weight, and cost of crushed stone or gravel needed to build or resurface a driveway. Unlike asphalt or concrete driveways, gravel driveways use multiple layers of progressively smaller aggregate to create a stable, well-draining surface. Accurate material estimates prevent costly over-ordering (gravel is heavy and difficult to remove once spread) and project delays from running short. A properly constructed gravel driveway consists of two or three layers. The base layer uses large crushed stone (typically #3 or #4 stone, 1 to 2.5 inches) at 4 to 6 inches deep. This layer provides structural support, prevents rutting under vehicle weight, and promotes drainage. The surface layer uses smaller angular stone (typically #57 stone or 3/4-inch crusher run) at 2 to 3 inches deep. This layer provides the driving surface, interlocks under compaction, and resists displacement from tires. Some installations include a middle layer of #57 stone between the base and surface. Gravel is sold by the ton for bulk delivery. The conversion factor from cubic yards to tons varies by material type, but 1.4 tons per cubic yard is the standard estimate for crushed limestone, granite, and most common driveway aggregates. River rock and pea gravel are slightly lighter at 1.2 to 1.3 tons per cubic yard. Recycled concrete aggregate falls in the 1.3 to 1.5 range depending on composition. The waste factor accounts for material lost to the subgrade (gravel pressed into soft soil), spreading beyond the driveway edges, and slight variations in depth across the surface. A 10% waste factor is standard for most installations. Increase to 15% for driveways built on soft clay soil or in areas with poor drainage, as the base layer will sink more into the subgrade before stabilizing. Cost for delivered gravel varies by region, material type, and distance from the quarry. The national average is $25 to $50 per ton delivered for common driveway stone, with $30 per ton being a reasonable planning estimate. Premium materials (decorative stone, imported aggregate) cost $50 to $100 per ton. Delivery charges are typically included in the per-ton price for orders over 10 tons; smaller loads may incur a flat delivery fee of $50 to $150. Gravel driveways require periodic maintenance. Expect to add 1 to 2 inches of surface gravel every 2 to 3 years to replenish material displaced by traffic, snowplowing, and erosion. Grading with a box blade or driveway drag once or twice per year keeps the surface smooth and maintains proper crown for drainage.
How to Calculate
- Measure the driveway length in feet from the road to the parking area
- Measure the driveway width in feet (single lane is 10-12 ft, double is 16-20 ft)
- Set the base layer depth in inches (4 inches minimum for residential, 6 inches for heavy traffic)
- Set the surface layer depth in inches (2 inches minimum)
- Adjust waste factor (10% standard, 15% for soft soil)
- Review total cubic yards, tons, and estimated delivered cost
- Contact local quarries for current pricing per ton in your area
Formula
Area = Length (ft) x Width (ft) Base Volume = Area x Base Depth (in) / 12 / 27 Surface Volume = Area x Surface Depth (in) / 12 / 27 Total Volume = (Base Volume + Surface Volume) x (1 + Waste % / 100) Total Tons = Total Volume x 1.4 tons per cubic yard Estimated Cost = Total Tons x $30 per ton Where 12 converts inches to feet, 27 converts cubic feet to cubic yards, and 1.4 tons/cu yd is the standard density for crushed limestone and granite driveway aggregate.
Example Calculation
A 50 ft x 12 ft driveway with 4-inch base and 2-inch surface, 10% waste: Area = 50 x 12 = 600 sq ft Base Volume = 600 x (4 / 12) / 27 = 600 x 0.3333 / 27 = 7.41 cu yd Surface Volume = 600 x (2 / 12) / 27 = 600 x 0.1667 / 27 = 3.70 cu yd Raw Total = 7.41 + 3.70 = 11.11 cu yd With 10% Waste = 11.11 x 1.10 = 12.22 cu yd Total Tons = 12.22 x 1.4 = 17.11 tons Estimated Cost = 17.11 x $30 = $513.33
Frequently Asked Questions
How deep should a gravel driveway be?
A residential gravel driveway needs 6 to 8 inches total depth: 4 to 6 inches of large crushed stone base topped with 2 to 3 inches of surface gravel. Driveways with heavy vehicle traffic (trucks, RVs, construction equipment) should have 8 to 12 inches of base. The base depth is more critical than the surface depth — a thick base prevents rutting and pothole formation.
What type of gravel is best for driveways?
The best surface gravel for driveways is 3/4-inch angular crushed stone (crusher run or #57 stone). Angular pieces interlock under compaction, creating a stable surface that resists displacement. Avoid smooth round stones (pea gravel, river rock) for the driving surface — they roll under tires and never compact firmly. For the base layer, use #3 or #4 stone (1 to 2.5 inches) for maximum stability.
Do I need to put fabric under a gravel driveway?
Geotextile landscape fabric between the subgrade and base layer is recommended for driveways built on clay or silt soils. The fabric prevents the base stone from sinking into soft soil, maintains separation between layers, and improves long-term stability. It costs $0.10 to $0.25 per square foot and can extend the time between gravel replenishment by several years. On sandy or firm soils, fabric is optional.
How much does a gravel driveway cost compared to asphalt or concrete?
Gravel driveways cost $1 to $3 per square foot installed, including materials, grading, and compaction. Asphalt driveways cost $3 to $7 per square foot. Concrete driveways cost $6 to $15 per square foot. For a 600 square foot driveway, that translates to approximately $600-1,800 for gravel, $1,800-4,200 for asphalt, and $3,600-9,000 for concrete. Gravel has lower upfront cost but higher maintenance requirements.
How many tons of gravel fit in a dump truck?
A standard tandem-axle dump truck carries 15 to 20 tons of gravel (about 10 to 14 cubic yards). A triaxle truck carries 22 to 26 tons. A single-axle truck carries 8 to 12 tons. For a typical residential driveway project of 15 to 20 tons, one tandem load covers the job. Always confirm truck capacity with your supplier to coordinate delivery logistics.
Can I put gravel over an existing dirt or mud driveway?
Yes, but proper preparation is essential. Remove the top 2 to 4 inches of topsoil and organic material (mud, leaves, roots), grade the subgrade for drainage (crown the center 1/4 inch per foot for water runoff), compact the subgrade with a plate compactor, then install gravel layers. Placing gravel directly over mud without excavation and compaction typically leads to sinking, rutting, and failure within one to two seasons.