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Gravel Driveway Calculator – How Much Gravel Do I Need? | SmartCalcBase
DIY & Construction

Gravel Driveway Calculator

Find out exactly how many cubic yards and tons of gravel you need for your driveway — with cost estimate and a complete guide to choosing the right gravel type.

Enter your driveway details
Measurement units:
Standard single car: 10–12 ft. Double: 20–24 ft.
New driveway: 4–6 in. Top-up: 1–2 in.
Optional — for cost estimate. Avg. $25–$65/ton.
Base layer
Top / finish layer
Gravel needed
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How to use this gravel driveway calculator

  1. Measure your driveway — length and width in feet (or meters). For irregular shapes, measure the longest and widest points, or break it into sections and add the results.

  2. Choose your gravel depth. For a new driveway, 4–6 inches total is standard. For a top-up over existing gravel that has thinned out, 1–2 inches is usually enough.

  3. Select your gravel type. Different gravels have different densities — the calculator uses the correct weight per cubic yard for each type to give you an accurate tonnage figure.

  4. Enable multi-layer mode if you’re building a new driveway from scratch — most professional driveways use a compacted base layer (4 in.) plus a finish layer (2 in.) of a different material.

  5. Add a price per ton to get an instant cost estimate. Click Calculate to see cubic yards, tons, and total cost all at once.

How is gravel quantity calculated?

Gravel is sold and delivered by the cubic yard or by the ton, depending on the supplier. The volume calculation is straightforward, but converting to tons requires knowing the density of your specific gravel type.

Cubic yards = (Length ft × Width ft × Depth ft) ÷ 27

Depth (ft) = Depth (in) ÷ 12

Tons = Cubic yards × Density (tons/yd³)

With waste factor: result × (1 + waste%)

Gravel density varies significantly: pea gravel weighs roughly 1.4 tons/yd³, while compacted road base can reach 1.75 tons/yd³. Using the wrong density can lead to ordering 20–25% too little or too much material.

How much gravel depth do you need?

Project typeRecommended depthNotes
New driveway (total)4–6 inches4 in. base + 2 in. top layer is ideal
Top-up / resurfacing1–2 inchesOver existing compacted gravel
High-traffic driveway6–8 inchesFor heavy vehicles or trucks
Pathway / walkway2–3 inchesFoot traffic only
Parking area4–6 inchesSame as driveway standard
French drain fill12–18 inchesUse drainage gravel, not decorative

Which gravel is best for a driveway?

Gravel typeBest useDensity (tons/yd³)Avg. cost (ton)
Crushed stone (#57)Top layer, drainage, driveways1.45$30–$55
Road base / crushed baseBase layer, compaction1.75$20–$40
Pea gravelTop layer, decorative, paths1.40$35–$65
Crushed limestoneBase or top, affordable1.55$25–$45
Caliche / decomp. graniteSouthwest driveways, compacts well1.50$20–$40
River rock / decorativeAesthetic driveways, low traffic1.35$45–$90

Prices vary by region and season. Always get a local quote — prices can differ significantly from the national averages above.

How much gravel for common driveway sizes?

At 4-inch depth, crushed stone, includes 10% waste factor.

3.6 yd³10×100 ft
single lane
7.2 yd³20×100 ft
double lane
1.8 yd³12×50 ft
short driveway
5.4 yd³12×150 ft
long driveway

Frequently asked questions about gravel driveways

A 12×100 ft driveway at 4 inches deep needs approximately 4.9 cubic yards of gravel, which is roughly 7.1 tons of crushed stone (at 1.45 tons/yd³). With a 10% waste factor, order about 5.4 cubic yards or 7.8 tons. Use the calculator above to adjust for your exact dimensions, depth, and gravel type.
For a new driveway, a total depth of 4–6 inches is the standard. The best approach is two layers: a 4-inch compacted base of road base gravel, topped with 2 inches of a finer finish gravel like crushed stone #57 or pea gravel. For driveways that will see heavy trucks or vehicles, go up to 8 inches total.
For most driveways, the best combination is road base or crushed limestone for the base layer (it compacts tightly and doesn’t shift) topped with crushed stone #57 as the surface layer. Pea gravel looks great but tends to scatter and roll underfoot. River rock is decorative but not ideal for driven surfaces. In the Southwest, decomposed granite (caliche) is a popular and cost-effective option.
Material costs for a gravel driveway typically run $1–$3 per square foot for the gravel itself. A 12×100 ft driveway would cost roughly $1,200–$3,600 in materials. Installation labor (grading, compaction, fabric) adds $1–$2 per square foot. A fully installed gravel driveway usually runs $1,500–$6,000 depending on length, base prep needed, and local rates. Use the cost estimator in our calculator for material costs based on your local price per ton.
For driveways, landscape fabric (geotextile) is highly recommended under the base layer. It prevents the gravel from sinking into soft or muddy soil, suppresses weeds, and significantly extends the life of the driveway. Use a heavy-duty woven geotextile rated for vehicular use — the thin garden fabric sold for flower beds will not hold up under vehicle weight.
Most gravel driveways need a top-up every 2–5 years. Gravel spreads, sinks, and washes away over time — especially in areas with heavy rain or steep grades. A 1–2 inch top-up each time is usually enough to restore the surface. Adding edging or borders on the sides dramatically reduces how much gravel migrates off the driveway, extending time between top-ups.
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