Estimate gravel for one layer or build separate base and surface orders with supplier rounding and delivery.
Before measuring a delivery, decide whether this is a surface refresh, replacement of failed material, or new construction. A quantity estimate cannot tell you why a driveway is rutting or holding water. If the cause is unknown, obtain a site assessment before ordering a larger top-up.
The FHWA Gravel Roads Construction and Maintenance Guide, section III, 3.2–3.3 explains that aggregate made for a pavement base or general fill may perform poorly as an exposed gravel surface. Surface gravel needs an appropriate blend of stone, sand and binding fines. A product that drains readily is not automatically a stable wearing surface.
This road-maintenance reference explains the distinction; it does not specify a residential driveway design. Do not copy a fines percentage, thickness or road specification without checking local soil, drainage and vehicle requirements with the person specifying your project.
Illustrative decision: two suppliers offer the same volume at different prices. One identifies an aggregate intended for your specified exposed wearing surface; the other offers an unspecified clean stone. These are not yet comparable quotes. Ask the second supplier to quote the required specification before choosing the cheaper load. This check comes before the calculator's price comparison; the calculator cannot detect a material substitution.
Material selection reviewed November 6, 2026. This is a purchasing workflow, not an engineering design or a claim of on-site experience.
Material-choice review: November 2, 2026. These are planning choices, not a site inspection or a drainage specification.
These are independent worksheets. Inputs do not transfer between them. Use the download button beside the result you want to keep.
Whole packages round up. Prices include only the items you enter. Delivery, tax and installation may be extra.
A driveway with uneven remaining material needs measured additional depths. A single deepest reading across the whole footprint can overstate a top-up.
Divide the footprint into non-overlapping zones. The example has two 20 × 10 ft halves: one needs 1 additional inch, the other 3. Do not enter existing gravel that remains as new material. A depth survey and your selected design determine these inputs.
Original hypothetical scenarios for checking the arithmetic. Depths, conversion factors and buying increments are editable assumptions, not construction or product recommendations. The two cases are alternatives, not quantities to add.
Factor 1; extra 10%; bag yield 0.5 cu ft; bulk increment 0.25 cu yd; individual bags.
Factor 1; extra 10%; bag yield 0.5 cu ft; bulk increment 0.25 cu yd; individual bags.
Loading a case replaces the multi-area worksheet’s measurements and resets its prices to unknown. Save your own worksheet first. These buttons require JavaScript; all example quantities remain readable above.
The two-zone case averages 2 in across 400 sq ft; the uniform case is a different, larger need. Both use loose-depth factor 1, 10% extra and quarter-yard orders. Neither calculation selects a structural thickness or validates drainage. Do not pool different base and surface products into one line.
Identify whether the quote is for a surface top-up or multiple material layers. Record aggregate grade, delivered buying unit, surveyed depth basis and placement or grading charges.
Use separate base and surface orders when the products or delivery terms differ.
Combine non-overlapping rectangles at different depths, subtract exclusions and round bags once for the total. All rows must use the same material. This worksheet is independent of the quick calculator above.
How to split an irregular area · How to compare a bulk quote with bags
Use this independent worksheet when base and surface materials have different depths or purchase rules. The sample depths and conversion factors demonstrate arithmetic; they do not design a driveway or specify a stone grade. Enter your approved project dimensions and supplier terms.
Each layer uses its own footprint, conversion and supplier rounding. Keep these lines separate even if they travel on the same delivery.
| Layer | Measured / adjusted (cu yd) | Purchase / surplus (cu yd) | Weight at entered density | Material + delivery |
|---|---|---|---|---|
| Base material 400 sq ft footprint | 4.9383 / 6.2222 | 6.5 / 0.2778 | Density not supplied | Unpriced material + $0.00 |
| Surface material 400 sq ft footprint | 2.4691 / 2.8519 | 3 / 0.1481 | Density not supplied | Unpriced material + $0.00 |
Partial entered subtotal: $0.00
Missing material price: Base material, Surface material. Delivery is the sum of the two allocated charges. If one quote covers both, enter it on one layer and zero on the other. Zero prices mean unknown, not free. Tax, excavation, grading, disposal, equipment and installation are excluded.
Weight uses the rounded purchase volume and each layer’s supplied density. This is not a truck loading or payload calculation. A price quoted per ton must be converted with the supplier before using these per-cubic-yard price fields.
For a 40 × 10 ft rectangle, a 4 in base has 400 × 4 ÷ 324 = 4.9383 cu yd before adjustments. An illustrative 1.20 loose factor and 5% handling allowance make 6.2222 cu yd; a 0.5 cu yd buying increment rounds this to 6.5.
A separate 2 in surface layer, factor 1.10 and 5% allowance needs 2.8519 cu yd. A 0.25 cu yd buying increment rounds this to 3.0. Do not round their combined volume and order one unspecified stone.
At invented base/surface rates of $60/$80 per cubic yard and allocated delivery of $50/$60, the subtotal is (6.5 × 60 + 50) + (3 × 80 + 60) = $740. At supplier-confirmed example densities of 1.4 and 1.5 US tons/cu yd, these purchases would be 9.1 and 4.5 US short tons respectively.
If base extends 1 ft on each outside edge, its footprint is 42 × 12 = 504 sq ft and its rounded order becomes 8 cu yd. The surface remains 3 cu yd. For a surface-only top-up, set base depth to zero: the same surface scenario is $300. These examples illustrate quantities, not appropriate construction thicknesses.
Check minimums, increments and delivery costs · Record the exact aggregate and quote scope
Calculate each layer separately. This volume tool does not choose the base depth, grade or load capacity.
Length (ft): 40 · Width (ft): 12 · Material depth (in): 4 · Bag yield (cu ft): 0.5 · Extra material (%): 10.
These inputs produce 6.52 cubic yards to order. Change the measurements above to match your project.
Measure each driveway segment and calculate each aggregate layer separately. A flared entrance may be approximated with several rectangles; do not apply its widest dimension to the entire driveway. Depth represents the layer being ordered, not the whole excavation.
A 40 × 12 ft layer at 4 in has 5.9259 cu yd before adjustments. If the supplied depth is already on a loose-volume basis, a 10% allowance gives 6.5185 cu yd. At a hypothetical supplier density of 1.4 US tons/cu yd, that is 9.1259 US tons. The density is an example and must be replaced with the quoted product value.
Tons measure mass and yards measure volume. Different gradations and moisture levels do not share a universal conversion. Adding depth to a surface that already contains usable gravel can overstate the top-up order; measure the additional required layer.
Ask for aggregate type, conversion basis, minimum load, delivery charge, spreading availability and access requirements. The tool does not design a driveway for traffic or drainage. A base layer and a wearing layer may need different materials and separate orders.
Only the explicit loose-volume factor changes the measured volume. Keep it at one for a loose-order depth.
No. The optional density field is US short tons per cubic yard. Do not enter a metric-tonne conversion without converting the units.
This worksheet uses the geometry and editable assumptions shown above. Product specifications and local quotes determine the inputs.
YardTakeoff · Revised October 21, 2026 · Formula checks and scope · Report a calculation error