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Gravel Driveway Calculator

Estimate gravel for a rectangular driveway, with an optional separate base layer. Convert finished depth into loose ordering volume, round supplier orders, and budget for separate delivery loads.

Switching converts dimensions, densities, weight increments, payload, and prices per weight. Currency stays USD.
Use the planned depth after placement, not the depth of a loose delivery pile.
Enter zero for resurfacing without a new base. Example depths are not a construction specification.
Added to finished volume for both layers. Ask the supplier about compaction and handling allowance; 15% is illustrative.
Use the supplier's loose density including voids, not solid rock density.
Each material rounds up separately. Confirm minimum orders with the supplier.
Use the actual permitted payload, not gross vehicle weight. Volume limits are not modeled.
Tax applies to material only here. If delivery is taxable locally, add that separately to your budget.

How much gravel do I need for a driveway?

Start with the driveway's area and the finished depth of each material layer. Those dimensions give a volume, but suppliers often sell aggregate by weight. To turn cubic yards into tons reliably, you need the loose bulk density for the actual product. This calculator keeps the surface and optional base separate, adds an explicit loose-volume allowance, rounds each purchase to your supplier's weight increment, and estimates delivery loads without assuming different materials can share a truck.

It is useful for comparing quotes, planning a top-up, or preparing an initial material budget for a rectangular driveway. It does not design a pavement structure or decide how deep your base should be. Soil strength, drainage, climate, vehicle loads, existing condition, and local construction practice determine the required section. The default two-inch surface and four-inch base are arithmetic examples, not recommendations for a particular driveway.

Volume, weight, and delivery formulas

  • Area: driveway length multiplied by width.
  • Finished cubic yards: length in feet multiplied by width in feet multiplied by depth in inches, divided by 324.
  • Finished cubic meters: length in meters multiplied by width in meters multiplied by depth in centimeters, divided by 100.
  • Loose planning volume: finished volume multiplied by one plus allowance / 100.
  • Estimated weight: loose planning volume multiplied by the matching loose bulk density.
  • Rounded order weight: estimated weight divided by supplier increment, rounded up, then multiplied by that increment.
  • Loads per material: rounded order weight divided by usable truck payload, rounded up.
  • Total budget: rounded material purchases plus material-only tax plus delivery price multiplied by the sum of separate loads.

The divisor 324 combines twelve inches per foot and twenty-seven cubic feet per cubic yard. A US short ton is 2,000 pounds; a metric tonne is 1,000 kilograms. They are not interchangeable. Switching units converts density, payload, order increment, and price along with the dimensions. Currency remains USD, so switching to metric does not convert dollars into a different national currency.

Worked example: a 60-by-12-foot driveway

The example driveway covers 720 square feet. A two-inch finished surface layer needs 720 times 2 / 324, or about 4.44 cubic yards. Adding a 15% loose-volume allowance gives about 5.11 cubic yards. At the example loose density of 1.4 short tons per cubic yard, estimated weight is about 7.16 short tons. With a half-ton ordering increment, the surface order rounds to 7.5 short tons.

The four-inch base needs about 8.89 finished cubic yards, or 10.22 loose cubic yards with the same allowance. At 1.5 short tons per cubic yard, estimated weight is about 15.33 short tons, rounded to 15.5 short tons. The combined order is 23 short tons, but it remains two different materials. A ten-short-ton payload means one surface load and two base loads, or three delivery loads in total.

At $45 per short ton for surface material and $35 for base, material cost is $337.50 plus $542.50, totaling $880. Material-only tax at 6% adds $52.80. Three deliveries at $100 each add $300. The displayed delivered material budget is therefore $1,232.80. Excavation, disposal, grading, fabric, equipment rental, compaction labor, drainage work, and any tax on delivery remain outside this estimate.

Choosing bulk density without false precision

Loose bulk density describes the mass of a volume of aggregate as delivered, including the spaces between particles. It is not the mineral density of an individual piece of rock. Product grading, fines, moisture, particle shape, and quarry source affect the conversion. There is no single exact number of tons in a cubic yard of every gravel. Ask for your supplier's conversion factor for the named material, and make sure it refers to loose bulk volume.

If a supplier quotes pounds per cubic foot, multiply that value by 27 and divide by 2,000 to obtain short tons per cubic yard. For example, 100 pounds per cubic foot converts to 1.35 short tons per cubic yard. A value in kilograms per cubic meter converts to tonnes per cubic meter by dividing by 1,000. Keep the price basis consistent with the weight unit. The example density and prices are placeholders, not a current regional price guide.

What the loose-volume allowance actually means

The allowance is an addition to finished geometric volume. Entering 15% means ordering an estimated loose volume equal to 1.15 times finished volume before weight rounding. It is not a claim that the material will lose exactly 15% of its loose volume during compaction. If a supplier instead describes a fractional shrinkage of loose volume, convert that relationship carefully: a 15% shrinkage would require approximately 17.65% extra over finished volume, because 1 / 0.85 is about 1.1765.

Use one allowance agreed with the supplier or contractor for compaction and handling; do not automatically stack several percentages for the same effect. This tool applies the same entered allowance to both layers. If the products require different factors, calculate them separately with the base omitted and combine the confirmed quotes. It reports unrounded loose volumes and rounded order weights separately so the extra material caused by order increments stays visible.

Resurfacing, irregular shapes, and delivery access

For a top-up, set base depth to zero and enter only the new finished surface thickness. The base density and price fields are then disabled and ignored. Do not enter the full existing driveway thickness unless you actually intend to replace that material. On a rutted surface, measure several locations and determine an appropriate average new thickness. Hidden soft spots or drainage failures cannot be solved by trusting a volume calculation alone.

For an L-shaped driveway, turnouts, or a parking pad, split the plan into nonoverlapping rectangles and calculate each section. The tool assumes uniform depth over each rectangle and does not subtract obstructions automatically. Avoid rounding every small section into a separate supplier purchase when they use the same material; combine their unrounded volume estimates first, then confirm the final order. Curves, slopes, and changing widths may need a surveyed area or a contractor's takeoff.

Delivery counts are based on usable payload by weight and round upward independently for each material. A truck may reach its body-volume limit before its weight limit, or site restrictions may require smaller vehicles. Confirm bridge limits, turning space, overhead clearance, unloading locations, and whether the driver can spread material. The estimate assumes one charge per load and no shared or split-material deliveries. Supplier minimum orders, distance surcharges, waiting fees, and partial-load pricing can change the quote.

Frequently asked questions

  • Should I order by tons or yards? Use the supplier's selling unit. This tool calculates both geometric volume and weight, but a density estimate cannot replace a weigh ticket or a firm supplier quote.
  • Can surface and base be combined into one order? The total weight is a budget summary, not a mixing instruction. Layers are kept separate because products, prices, and truckloads may differ.
  • Why does doubling area not always double cost? Material rounding and whole delivery loads create steps. A small added area can trigger another half-ton increment or another truck.
  • Is the total a complete installed driveway cost? No. It covers purchased material, the entered material tax, and modeled delivery only. Request separate site preparation and installation quotes.
  • Does the tool choose the correct stone size? No. Select products and layer depths with a supplier or qualified local contractor based on drainage, subgrade, traffic, and applicable requirements.

Sources and further reading

Vulcan Materials' construction aggregates calculator provides a supplier reference for dimension- and density-based aggregate estimation. The formulas here make the same geometric relationship explicit while adding separate layer orders and a delivery budget. Confirm density, compaction expectations, material grading, and prices with your own supplier; the defaults are not Vulcan product specifications or quotes.

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Last updated: 2026-10-09. Material planning only; verify supplier quantities and obtain site-specific construction advice.

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