Free calculator
Gravel Driveway Calculator
Use this gravel driveway calculator to turn driveway length, width, total depth, compaction allowance, waste, and density into cubic feet, cubic yards, tons, and an optional bulk cost. It produces a printable material list for planning a layered crushed stone driveway before you order or call a supplier.
EstimateEstimate only; subgrade, drainage, slope, compaction, stone gradation, and local conditions vary. Consult a professional for traffic-load or drainage questions.
Project inputs
Estimate
11.2 cubic yards of driveway gravel
A 480 sq ft driveway at 6 inches deep needs about 11.2 cubic yards, or 15.68 tons, of gravel after compaction and waste.
Printable material list
Estimate- Driveway gravel11.2 cu yd20% compaction and 5% waste included
- Gravel by weight15.68 tons1.4 tons/cu yd density
- Bulk cost placeholder$504.00$45/cu yd assumption
- Base and top layersplan separatelya coarse base under a finer top performs better
Estimate only. Driveways usually use layered stone over a prepared subgrade; soil, drainage, and vehicle loads change the right build.
Visible defaults
Assumptions
- Cubic yards equal cubic feet divided by 27.
- Default total depth is 6 inches across all layers combined.
- Compaction and waste are added on top of the loose volume.
- Default density is about 1.4 tons per cubic yard for crushed stone.
Math
Calculation details
- Area = length x width.
- Cubic feet = area x total depth in feet.
- Compaction allowance is added before waste.
- Cubic yards = cubic feet / 27; tons = cubic yards x density.
What this gravel driveway calculator does
A gravel driveway is usually built in layers, not as one scoop of stone. This calculator takes your driveway length, width, total depth, density, compaction allowance, and waste, then converts the same volume into cubic feet, cubic yards, tons, and an optional bulk cost. Crushed stone is often sold by the ton at the scale and by the cubic yard at the yard, so it shows both units side by side.
Use the result as a planning estimate to compare quotes and decide on a delivery size. It does not decide whether the subgrade, drainage, slope, or stone gradation suit vehicle traffic at your site. It simply turns a measured driveway into a practical ordering list with every assumption visible, leaving the site-specific build decisions to you and your supplier.
Depth and the layered approach
Most gravel driveways stack a coarse base under a finer top. A common planning split for a six inch driveway is a coarse base of about three inches, a transition or middle layer of about two inches, and a finer top course of about one inch. The base carries the load and sheds water; the top gives a tighter, more comfortable driving surface. Adjust the total depth to match how the drive will be used.
Measure length and width in feet and enter the total depth in inches. For a long drive that changes width, break it into sections or use an average width. New driveways generally need more total depth than a refresh over an existing compacted base. When you are only topping up a worn surface, reduce the total depth to the new stone you actually plan to add.
Formula used
The calculator multiplies length by width to get square feet, then multiplies by total depth in feet to get loose cubic feet. Cubic yards are cubic feet divided by 27. It then adds the compaction allowance and the waste percentage on top of that volume, because crushed stone loses thickness when it is rolled and packed. Tons are cubic yards multiplied by the density you enter.
Compaction is the part homeowners most often miss. Loose stone settles noticeably once it is graded and driven on, so ordering only the loose volume leaves the finished depth short. A compaction allowance of roughly fifteen to twenty percent is a common planning figure. Density also varies by stone type and moisture, so replace the 1.4 tons per cubic yard default with your supplier's number when ordering by weight.
Ordering by the ton or cubic yard
Driveway stone is frequently priced and delivered by the ton, while the volume you actually need is easier to picture in cubic yards. The calculator keeps both so you can match whatever the supplier quotes. Tons depend on density, which means two yards can give different ton figures for the same cubic yards. When in doubt, share your cubic yards and let the scale do the weight conversion.
The optional cost field multiplies cubic yards by your entered price per cubic yard. It is a simple comparison number only. It does not include delivery, spreading, grading, fuel surcharges, minimum loads, taxes, or regional pricing. Use it to size up the job and compare two suppliers, not as a finished price for the driveway.
Common mistakes
The biggest mistake is ordering loose volume with no compaction allowance and then finding the finished driveway too thin after packing. Another is treating square feet as cubic feet and ignoring depth entirely. A third is buying a single uniform stone for the whole depth instead of a coarse base under a finer top, which often makes the surface harder to keep level and tidy.
People also forget that a long driveway covers a lot of area, so small depth changes move tons quickly. Skipping a waste factor for edge spill, low spots, turnarounds, and grading loss tends to leave the order short. It is usually cheaper to round the delivery up a little than to pay a second delivery fee for a few missing yards.
Before you order
Bring the printed list, your driveway dimensions, and the layer plan to the supplier. Confirm the stone gradation for each layer, the density used for the ton conversion, and whether the price is per ton or per cubic yard. Ask about delivery minimums, truck access, and where the stone can be dumped relative to where it will be spread.
Keep the disclaimer with the list. This is a planning estimate, and local conditions vary. Subgrade strength, drainage, slope, frost, and traffic all affect how a gravel driveway should be built and how it holds up. For questions about whether a build will carry vehicle loads or meet local rules, consult a qualified professional before placing the order.
Quick reference
Common gravel driveway depth by layer (planning guidance)
| Layer | Typical depth | Coverage per cubic yard |
|---|---|---|
| Coarse base | 3 in | 108 sq ft |
| Middle layer | 2 in | 162 sq ft |
| Top course | 1 in | 324 sq ft |
| Total | 6 in | 54 sq ft |
Coverage per cubic yard equals 324 divided by depth in inches, using 1 cubic yard = 27 cubic feet. Depths are planning ranges, not an engineered design. Add compaction and waste.
FAQ
Gravel Driveway Calculator FAQ
How do I calculate gravel for a driveway?
Multiply length by width to get square feet, multiply by total depth in feet for cubic feet, then divide by 27 for cubic yards. Add compaction and waste, then convert to tons using the supplier density.
How many tons of gravel do I need for a driveway?
Find cubic yards first, then multiply by density. At about 1.4 tons per cubic yard, a 100 square foot drive at 6 inches deep is near 1.85 cubic yards, or roughly 2.6 tons before compaction and waste.
How deep should a gravel driveway be?
A common planning total is around 6 inches, often split into a coarse base, a middle layer, and a finer top. Heavier use or soft subgrade may need more depth. This is planning guidance, not an engineering spec.
Why does the calculator add a compaction allowance?
Loose crushed stone settles when it is graded and driven on, so the finished depth is less than the loose depth. The compaction allowance adds extra material so the packed driveway reaches the depth you planned.
Should driveway gravel be ordered in layers?
Many gravel driveways use a coarse base under a finer top for stability and a smoother surface. You can estimate each layer separately by changing the depth, then add the results into one total order.
Does this include grading, fabric, or drainage?
No. It estimates stone volume, tons, and a cost placeholder only. Add geotextile fabric, edging, culverts, grading labor, and drainage separately based on your actual site and supplier advice.
Methodology
Who built and reviewed this estimate
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