Measure the material footprint

Measure the planned stone layer inside its edging. If a driveway widens at the entrance, divide it into a straight rectangular run and a triangular flare. On a trench, measure the section occupied by stone and account separately for a large pipe or structure that displaces fill. Follow the drainage or pavement detail when selecting the aggregate gradation and depth.

A quarry may quote by ticketed weight even when the plans specify a finished volume. Ask for its conversion from loose tons to placed cubic yards for the exact product. Keep its adjustment for placement separate from your allowance for handling loss. For work under a slab, confirm the required subgrade preparation and inspection before the truck arrives. Delivery weight and a level surface do not establish that the specified compaction has been achieved.

Work through this estimate

Start with the geometry for 20 × 20 ft at 6 in. The footprint is 20 ft × 20 ft, which gives 400 square feet. Convert the depth to the same unit before multiplying. Dividing 6 inches by twelve gives 0.5 feet. The footprint times that depth gives 200 cubic feet in place. Keep the full precision on the worksheet and round only the displayed result. For a tapered section, measure enough cross sections to represent the change in area.

The current worksheet adds 10% for handling and variation. Multiplying the measured volume by 1.1 produces 220 cubic feet to order. Divide that value by twenty-seven to convert to 8.15 cubic yards. A yard is three feet in each direction, which accounts for all twenty-seven cubic feet. If your supplier quotes a different order increment, round the final combined project quantity up to the next increment it actually sells.

For weight, the model uses 2700 pounds per cubic yard. Applying that density to the order gives 22000 pounds. Dividing by two thousand gives 11 US short tons. Treat weight as a planning estimate. Moisture, source material and packing affect actual loads. Obtain the supplier’s density before using a takeoff to plan hauling, and use the carrier’s verified payload limits when arranging delivery.

Compare the purchase units

One 50 lb bag covers 0.5 cubic feet under this model. Dividing the unrounded order volume by the bag yield and rounding upward gives 440 bags. Look at the measured yield on the product label when changing brands. A bag’s weight and the volume it contributes to the finished job describe different quantities. If the store stocks multiple sizes, each row is a complete alternative for the same job. Choose one size or prepare a separate mixed-size order.

The bulk allowance uses $42.00 per short ton and a delivery fee of $125.00. For this worksheet that gives $587.00 delivered, compared with $2,629.00 for the least expensive bag option. Get an itemized local quote covering minimum loads, delivery distance, tax and placement. Include any equipment or extra trips in your own comparison. A small change in the delivery charge can reverse the result on a modest job.