Ordering gravel for a driveway sounds simple until you’re staring at a quote and second-guessing the number. Order too little, and you may end up paying for a second delivery. Order too much, and you’ll have leftover material taking up space in your yard.
While a gravel calculator can provide a quick estimate, understanding how the math works helps ensure you order the right amount of material for your project.
The good news is that estimating gravel is fairly straightforward once you know your driveway dimensions and desired depth.
Key takeaways
- Use the formula Length × Width × Depth (ft) ÷ 27 to estimate how many cubic yards of gravel you’ll need.
- Round up your order to account for compaction, settling, and minor grading variations.
- Most new gravel driveways need 4–6 inches of material, while a surface refresh typically requires about 2 inches.
- A compacted base material like crusher run helps create a stable foundation.
- Soft, sandy, or poorly draining soil may require additional base material.
- Buying gravel in bulk is usually far more cost-effective than purchasing bagged stone.
- Having your measurements and delivery details ready can make ordering faster and easier.
The formula
Gravel is typically sold by the cubic yard, so you’ll need to convert your driveway dimensions into cubic yards before ordering.
Use this formula:
Length (ft) × Width (ft) × Depth (ft) ÷ 27 = Cubic Yards
The number 27 comes from the fact that there are 27 cubic feet in a cubic yard (3 × 3 × 3 = 27). Since driveway dimensions are usually measured in feet, dividing by 27 converts the result into the unit most suppliers use for pricing and delivery.
Example calculation
A typical two-car driveway is about 20 feet wide and 40 feet long, giving you 800 square feet of surface area.
If you’re installing a 4-inch layer of gravel:
40 × 20 × 0.33 ÷ 27 = 9.8 cubic yards
Round up to 10 cubic yards to account for compaction, settling, and minor grading variations. It’s generally better to have a little extra material than to come up short.
If your driveway includes curves, flared entrances, parking areas, or turnarounds, measure those sections separately and add them to your total. Irregular shapes are easy to underestimate.
How deep should your gravel be?
The right depth depends on whether you’re building a new driveway or refreshing an existing one.
New driveway installation: Plan for 4–6 inches of total gravel depth. Many driveways use a compacted base layer topped with 1–2 inches of surface stone.
Topping off an existing driveway: Around 2 inches is often enough to refresh the surface and fill in minor ruts or low spots.
If your driveway regularly sees heavy vehicles or you’re located in an area with harsh freeze-thaw cycles, consider adding extra depth. A thicker gravel layer helps create a more stable foundation and can reduce rutting over time.
The soil beneath your driveway matters, too. Soft, sandy, or poorly draining soils may require additional base material to prevent settling. If you’re unsure what’s underneath your driveway, it helps to understand your soil type. In some cases, installers use a compacted layer of larger aggregate—such as 1.5- to 2-inch stone—beneath the base layer to improve stability and drainage.
Which type of gravel should you use?
Not all gravel performs the same way. Choosing the right material for each layer can make a big difference in how your driveway looks and holds up over time.
Crusher run (base layer)
Crusher run, sometimes called processed gravel, road base, or dense grade aggregate, is one of the most common materials used for driveway foundations.
Because it contains a mix of crushed stone and stone dust, it compacts tightly and creates a stable base that resists shifting. If you’re building a new driveway from scratch, crusher run is often the first layer installed.
¾-inch crushed stone (surface layer)
For the top layer, many homeowners choose ¾-inch crushed stone. It provides good drainage, handles vehicle traffic well, and creates a clean finished appearance.
Depending on your location and supplier, other surface materials may also be available, but ¾-inch crushed stone remains one of the most common driveway options.
Pea gravel and river rock
Pea gravel and river rock are popular decorative materials, but they tend to shift and scatter under vehicle traffic.
They’re generally better suited for walkways, landscape beds, and decorative borders than active driveway surfaces.
Matching gravel to the job
Gravel size matters as much as gravel type.
Larger aggregate is typically used in base layers because it provides strength and stability. Smaller stone is often used closer to the surface for appearance and finish quality.
Using the right material in the right layer helps create a driveway that lasts longer and requires less maintenance.
How much does driveway gravel cost?
Bulk gravel pricing varies based on material type, supplier, and location.
In many markets, gravel costs roughly $25–$50+ per cubic yard for material alone, with specialty stone often costing more.
Delivery can significantly affect your total project cost. Many suppliers have minimum order quantities, and delivery fees may be based on distance, load size, or both.
For most driveway projects, purchasing gravel in bulk is far more cost-effective than buying bagged stone from a home improvement store.
To put that into perspective, a cubic yard of gravel typically weighs between 1.3 and 1.5 tons, depending on the material. That’s roughly equivalent to dozens of individual bags of stone.
One question worth asking your supplier is whether the material contains stone dust or is fully washed. Washed stone drains better but doesn’t compact as tightly. For many driveway base layers, material that includes stone dust provides better compaction and stability.
How to order gravel for your driveway
Before placing an order, gather a few key details:
- Your driveway length and width in feet
- Your desired gravel depth in inches
- Whether you need base material, surface material, or both
- Your delivery address
- Any site access restrictions, such as low branches, gates, or narrow driveways
Loamy makes it easy to compare bulk gravel options from local suppliers without spending time calling around for pricing or availability. Once you have your measurements, you can browse materials, compare options, and place your order online.
Since deliveries are typically made by dump truck, make sure you have a clear drop-off area ready before your delivery arrives.
Find bulk gravel near you
Estimating gravel for a driveway comes down to three factors: your driveway dimensions, your desired depth, and the type of material you need. Taking a few minutes to calculate your needs upfront can help you avoid ordering too much or too little material.
Loamy helps homeowners compare bulk gravel, crushed stone, crusher run, and other landscape materials from local suppliers in one place. Instead of contacting multiple businesses individually, you can compare options online and order the materials you need for delivery.
Ready to get started? Browse gravel suppliers near you and find the right material for your driveway project.
FAQs
How many cubic yards of gravel do I need for a driveway?
A typical two-car driveway measuring 20 feet by 40 feet requires approximately 10 cubic yards of gravel for a 4-inch layer. To calculate your own needs, use this formula:
Length × Width × Depth (in feet) ÷ 27 = Cubic Yards
Always round up slightly to account for compaction, settling, and minor grading variations.
How deep should gravel be for a driveway?
For a new driveway, plan for 4–6 inches of total gravel depth. If you’re refreshing an existing gravel driveway, about 2 inches is usually enough to fill minor ruts and restore the surface.
What is the best gravel for a driveway?
Many gravel driveways use crusher run or processed gravel as a base layer because it compacts tightly and creates a stable foundation. For the surface, ¾-inch crushed stone is one of the most common choices because it drains well and holds up to vehicle traffic.
How much does driveway gravel cost?
Bulk gravel pricing varies based on material type, supplier, and location. In many areas, gravel costs roughly $25–$50+ per cubic yard for material alone, while specialty stone may cost more. Delivery fees typically depend on distance and order size.
How much does a cubic yard of gravel cover?
A cubic yard of gravel covers about 80 square feet at a depth of 4 inches. Coverage varies depending on installation depth—the deeper the gravel layer, the less area a cubic yard will cover.
Is it cheaper to buy gravel in bulk?
Yes. Buying gravel in bulk is typically much more cost-effective than purchasing bagged stone. A cubic yard of gravel weighs roughly 1.3–1.5 tons, making bulk delivery the practical choice for most driveway projects.
Can I use pea gravel for a driveway?
Pea gravel and river rock tend to shift and scatter under vehicle traffic, making them less suitable for active driveway surfaces. They’re generally a better fit for walkways, decorative borders, and landscape beds.