This topsoil calculator estimates how much topsoil you need — volume in cubic yards and cubic feet, scenario weight in tons, and whole bags to order — from measured area and depth plus product-specific density and package weight values you supply.
What to enter
- Measured area in square feet and selected depth in inches.
- A positive bulk density in pounds per cubic foot, with its density, moisture, and product basis.
- A nonnegative waste allowance for the scenario.
- A positive package weight in pounds per bag from the product information you are using.
- The density method or product label/version and an uncertainty range for area, depth, density, and package quantity.
Bulk density, moisture basis, package weight, and waste are user-supplied scenario values. No density, application depth, or product is recommended.
Method and variable definitions
Let A be area in ft^2, d depth in inches, w entered waste percentage, ρ entered bulk density in lb/ft^3, and p entered package weight in pounds.
The adjusted volume is displayed in cubic yards using 1 yd^3=27 ft^3. Scenario weight is displayed in short tons using 2,000 lb per ton. Whole packages are rounded up only after the unrounded adjusted volume and weight are calculated.
Worked order example
For 300 ft^2 at 6 in with zero added waste:
That is 150/27=5.555556… yd^3, displayed as 5.56 yd³. With an entered density of 75 lb/ft^3, the scenario weight is:
The displayed weight is 5.63 tons. At an entered package weight of 40 lb, ceil(11,250/40)=ceil(281.25)=282 whole packages.
Product-data audit before ordering
Record these values together so the estimate can be reproduced:
| Check | Value to record | Why it changes the result |
|---|---|---|
| Geometry | Area, depth, and measurement method | Sets base volume |
| Material basis | Bulk density and moisture/product basis | Converts volume to scenario weight |
| Allowance | Entered waste percentage | Scales volume before weight |
| Package | Label/version and pounds per bag | Sets the whole-package ceiling |
| Range | Low and high plausible inputs | Shows scenario sensitivity |
If the density and package label refer to different materials or moisture conditions, do not combine them as though they shared one basis.
Interpret the estimate
The cubic-yard result represents the entered geometry and waste allowance. The ton result is conditional on the entered bulk density; it is not a universal weight for topsoil. The package count is conditional on both that density and the entered package weight. For a plain cubic-yards-to-short-tons conversion without the bed-geometry and bag steps, the cubic yards to short tons calculator applies an entered density directly.
Actual quantity can differ because area, depth, bulk density, moisture, compaction, and package fill vary. Treat low and high input values as scenarios, not confidence intervals. Zero area or depth can produce zero volume, but density and package weight must remain positive. Blank provenance, basis, or uncertainty fields, negatives where prohibited, unsupported values, and invalid numeric entries do not produce an estimate.
Practical next step
Confirm the measured dimensions, then obtain density/moisture information and package weight for the specific product. Save those values beside the result. If density is uncertain, rerun the estimate across the documented range before comparing the whole-package quantity with the supplier’s packaging. For related landscape materials, pair the estimate with the mulch calculator and compost calculator; to measure the bed area first, use the square footage calculator.
Sources
-
NIST, “SI Units” — current web edition; unit-definition tables, accessed 2026-07-09. Route-specific boundary: context and terminology only; it does not supply an entered coefficient, uncertainty, recommendation, or approval.
-
How%20To%20Calculate%20Amounts%20Peat%20Moss%2C%20Compost%20%26%20Topsoil — Extension volume math for bulk topsoil and compost purchases: cubic yards = area (ft²) × depth ÷ 27, with 27 cubic feet per cubic yard; ordering guidance for lawn and landscape coverage.
-
National Institute of Standards and Technology (NIST), “Guide for the Use of the International System of Units (SI), Special Publication 811” — NIST SP 811 exact US-customary/SI conversion factors and unit relationships behind the cubic-yard (27 ft³) and short-ton (2,000 lb) readouts.