Calculation method
Find compacted cubic yards, multiply by the supplier's bulk density and grading allowance, then round upward to the delivery increment you can actually order.
Worked example: input to purchase quantity
A 30 ft × 10 ft (9.14 m × 3.05 m) area at 4 in (10.16 cm) deep is 100 ft³ (2.832 m³), or 3.704 yd³ (2.832 m³). At 1.4 US short tons/yd³ (1.661 t/m³) with 8% extra, the estimate is 5.60 short tons (5.08 t). A supplier selling in 0.5-ton (0.454 t) increments requires an order of 6.0 short tons (5.44 t).
Why gravel needs both volume and density
A driveway or base layer is measured in three dimensions, but bulk aggregate is often sold by weight. This calculator first finds the compacted geometric volume, converts cubic feet to cubic yards, and then applies the bulk density supplied for the chosen material. A grading allowance is added before the weight is rounded to the seller’s order increment. The output therefore distinguishes engineering geometry from the commercial quantity placed on a ticket.
There is no honest universal “tons per yard” for all gravel. Rock type, particle size, gradation, moisture, and how loosely the material is loaded change bulk density. Decorative stone, dense graded base, washed gravel, and lightweight aggregate should not inherit one another’s numbers. Ask the quarry or landscape supplier for a current conversion for the exact product. Enter US short tons per cubic yard in US mode or metric tonnes per cubic metre in metric mode.
Choose the right depth
Depth should describe the compacted layer being estimated. Loose material normally settles under equipment, so a project specification may require a thicker loose lift to achieve the target compacted thickness. This tool adds a percentage allowance but does not model a laboratory compaction factor. If plans distinguish loose and compacted volumes, follow the plans and supplier guidance rather than hiding the difference inside an arbitrary waste number.
Measure the finished boundaries and divide bends or turnouts into simple shapes. Long driveways should be checked at several widths. A cross slope, crown, soft area, or excavation error can materially alter volume. Base preparation also matters: aggregate disappearing into weak soil is not ordinary coverage. Geotextile, stabilization, drainage, and undercut decisions should be made before treating extra tonnage as a remedy.
Understand the rounding step
Bulk suppliers may quote half-ton, whole-ton, bucket, or truckload increments. Enter the smallest weight increment they will deliver or load. The calculator always rounds upward so the result is purchasable. This is different from rounding cubic yards first; density is applied to the unrounded volume, preserving the transparent sequence. For metric input, the displayed purchase is in metric tonnes even though the internal calculation uses a consistent canonical unit.
Truck capacity is not necessarily the same as the minimum order. A result larger than one legal payload may arrive in multiple loads. Confirm delivery access, overhead wires, gate width, turning room, dump location, pavement protection, and whether the driver can spread or only tip the load. Weight limits and road rules belong to the supplier and carrier, not this calculator.
Audit the number before ordering
Check that depth is in inches or centimetres, not feet or metres entered into the wrong field. Verify that density uses the displayed weight and volume units. Do not copy a value from an unrelated internet table when the seller can provide product data. Compare the result with a supplier quote stated in both weight and approximate volume; a large disagreement usually reveals a unit, density, or dimension assumption.
The estimate covers the selected aggregate layer only. Excavated soil, base and surface courses, drainage stone, edging, fabric, dust control, compaction equipment, and cleanup may require separate plans. Keep tickets from each load and measure the placed depth while work proceeds. Those records make any shortfall diagnosable instead of turning the final truck into guesswork.
Product and method reference
The external reference is provided to help verify product-specific planning context; its values are not copied into the calculator. Always use the current label for the material being purchased. Vulcan Materials aggregate product information.
Calculation and editorial review: October 29, 2026. Arithmetic runs in your browser; project inputs are not submitted to TwoCut.