Volume and weight answer different buying questions
Your measurements describe a finished volume. A supplier may quote that soil by cubic yard or by weight. Start with area × depth in inches ÷ 324 to find cubic yards, then multiply by your supplier's density if a ton quote needs comparing. This page uses US short tons; metric tonnes and UK long tons are different units.
The extra-volume allowance increases the measured volume before material pricing and weight conversion. Ask the supplier how their loose delivery volume relates to your required finished depth. Do not use the sample 15% as a site specification: settlement, compaction, and moisture depend on the soil and the work.
Worked example: 1,000 square feet at 4 inches
The finished volume is 12.3457 cubic yards. A 15% allowance gives 14.1975 cubic yards, shown as 14.20. At $38 per cubic yard, material costs $539.51. If the supplier confirms 1.2 US short tons per cubic yard, estimated weight is 17.04 tons.
At an alternative quote of $32 per ton, material would cost $545.19. Compare these on the same product grade, moisture basis, and delivery terms. The calculator does not add the two quotes together; it uses the per-yard quote for the installation calculation and shows the weight quote as an alternative.
Delivery and spreading can change the decision
Truck access, minimum order sizes, delivery distance, and where the load can be tipped affect the overall price. Obtain a delivered quote and check whether the full order needs more than one load. Enter the total delivery charge for the project rather than assuming the sample fee covers any quantity.
Spreading labor is another separate cost. Include machine time, hand finishing, and paid preparation. Use the landscape labor cost calculator for the crew cost, then add equipment hire or operating costs here. In the sample, $120 delivery, $320 labor, and $90 equipment produce $1,069.51 direct cost; 15% overhead and 35% margin require a $1,892.21 pre-tax price.
Plan the complete scope before quoting
This calculation does not select the appropriate soil, specify grading or drainage, or decide how much existing material must be removed. Confirm the product and scope before ordering. Keep removal and disposal visible in your estimate if they are part of the job.
For a finish layer of mulch, use the separate mulch quantity and cost calculator. Combine services in the landscaping estimate calculator, or use Landscape Estimate Pro to save soil assemblies, project templates, and actual job results. Save supplier units consistently so a cost per ton is never mistaken for a cost per cubic yard.