Quick answer: for a rectangular gravel layer, cubic yards = length in feet × width in feet × depth in inches ÷ 324. Calculate each non-overlapping area separately, add the volumes, then confirm the supplier's conversion to the unit it sells. Use the gravel quantity and cost calculator to check one rectangular layer; keep the measurements and supplier assumptions beside the result.
Measure the layer, not the property
Record the actual footprint that will receive gravel. Exclude planting pockets, paving and areas already at the intended level. Split an L-shaped bed into two rectangles that meet without overlapping. For a taper, measure several widths and divide it into short sections rather than using the widest dimension for the whole run. The cubic-yard volume calculator can check individual sections before you total them.
Depth needs an equally clear definition. A three-inch finished layer and a three-inch loose layer are not automatically the same quantity. Ask whoever specifies the work whether the depth is measured before or after compaction. Do not use a generic extra percentage to solve an unknown layer design. Decorative gravel, drainage aggregate and a vehicle-supporting base serve different purposes.
Worked example: a 40 × 10 ft gravel area
For a hypothetical 40-foot by 10-foot rectangle at a specified three-inch layer depth, area is 400 square feet. Three inches is 0.25 feet, so the geometric volume is 100 cubic feet, or 100 ÷ 27 = 3.7037 cubic yards. Retain the unrounded result until the order calculation is complete.
| Step | Calculation | Result |
|---|---|---|
| Measured area | 40 × 10 | 400 sq ft |
| Geometric volume | 400 × 3 ÷ 12 | 100 cu ft |
| Convert to yards | 100 ÷ 27 | 3.7037 yd³ |
| Illustrative handling allowance | 3.7037 × 1.05 | 3.8889 yd³ |
The 5% here is only an example assumption. It is not a recommended universal waste or compaction factor. With no supplier increment specified, 3.89 cubic yards is a planning description, not an instruction to order exactly that number.
Add a separate area without double-counting
Suppose the same project also has a separate 12 × 4-foot border at two inches deep. That border requires 12 × 4 × 2 ÷ 324 = 0.2963 cubic yards. Add it to the rectangle before applying any common allowance: 3.7037 + 0.2963 = 4.0000 cubic yards. A chosen 5% handling allowance would make 4.20 cubic yards.
If the border overlaps the main rectangle, subtract the overlap once. If it uses a different stone product, keep it as a separate order line instead of combining the volumes. For a driveway with distinct base and surface layers, use the driveway gravel layer takeoff method; this general guide does not select a structural section.
Convert cubic yards to U.S. short tons
Weight = cubic yards × the supplier's tons per cubic yard for that exact material. Confirm that “ton” means a U.S. short ton of 2,000 pounds rather than a metric tonne. If density is supplied in pounds per cubic foot, short tons = cubic feet × density ÷ 2,000. If it is pounds per cubic yard, use cubic yards × density ÷ 2,000.
For a purely hypothetical supplier conversion of 1.40 short tons per cubic yard, the combined 4.20-yard example becomes 5.88 short tons. If that supplier accepts half-ton increments and says to round the order upward, the resulting order would be 6.0 short tons. Neither the density nor the increment is a market standard; replace both with the supplier's written values.
Bulk density depends on product gradation, voids and moisture. A solid-rock density is not a suitable substitute for the loose bulk product. Vulcan's aggregate tonnage estimator explicitly separates project dimensions and density and directs buyers to confirm local conditions and availability.
Handle bags, low spots and compaction explicitly
For bagged gravel, divide the required cubic feet by the coverage volume printed on the particular bag, then round up to whole bags. A bag's weight alone does not establish universal coverage. QUIKRETE's All-Purpose Gravel product page identifies a specific bagged landscaping product; check its current package and data sheet rather than borrowing a concrete-mix yield or another gravel product's coverage.
Measure known low spots as additional volumes. For example, a 6 × 4-foot depression averaging one extra inch adds 6 × 4 × 1 ÷ 324 = 0.0741 cubic yards. Price or order that known quantity explicitly. Keep uncertain spillage, measurement error and compaction assumptions separate so you can see which allowance has already been included. Ask the supplier whether its conversion or recommendation already accounts for the specified compacted depth before adding another factor.
Turn the takeoff into a supplier conversation
Keep a dated order record in the free home-project planning workbook: measured dimensions, intended finished depth, geometric volume, any extra low-spot volume, chosen allowance, product description, density source and order increment. Reopen the calculator when an actual measurement or supplier value changes; there is no need to start again from a generic national estimate.
Request a written delivered quote with the product name and gradation, sale unit, minimum load, delivery charge and unloading location. Confirm truck access and ground conditions with the delivery provider. Local hauling distance, supplier stock and delivery restrictions affect the order and its cost; municipal drainage or driveway work may also require local approval. Do not assume the driver can spread the material or that excavation, fabric, edging, drainage and compaction labor are included in a material delivery.
Frequently asked questions
Should I always add 10%?
No. Separate measured extra volume from an uncertain handling allowance, and confirm whether the supplier already included compaction in its recommendation. A universal percentage can double-count an allowance or hide an unmeasured low spot.
How do I calculate gravel for two areas?
Calculate each non-overlapping area at its own depth, add volumes for the same product, and keep different products or layers on separate order lines.
Can I use one fixed tons-per-yard conversion?
Use the supplier's bulk conversion for the exact product and confirm the weight unit. Stone type, gradation, voids and moisture can change delivered weight for the same volume.
Does this guide choose a driveway base depth?
No. It calculates quantity from a specified depth. Soil, drainage, loads and local requirements determine the appropriate driveway layer design.