How is topsoil volume calculated?

For rectangular areas: Volume = Length × Width × Depth. For circular areas: Volume = π × (Diameter ÷ 2)² × Depth. For triangular areas: Volume = (Base × Height ÷ 2) × Depth. All dimensions must be in the same unit before multiplying.

How deep should I apply topsoil?

For a new lawn, 4–6 inches (10–15 cm) is recommended. For garden beds, 8–12 inches (20–30 cm) gives plants room to establish roots. For topdressing an existing lawn, 0.25–0.5 inches (0.6–1.3 cm) is typical.

How many cubic yards of topsoil do I need for 1,000 sq ft at 4 inches deep?

1,000 sq ft × (4 ÷ 12) ft depth = 333.3 cubic feet ÷ 27 = approximately 12.35 cubic yards. Add 5–10% for settling to be safe.

Why should I add a waste factor?

Topsoil compacts after it is spread and watered. Adding 5–10% to the calculated amount ensures you will not run short. For rough or uneven ground, 10% or more is advisable.

How much does a cubic yard of topsoil weigh?

A cubic yard of topsoil typically weighs 1,000–1,400 kg (2,200–3,000 lb), depending on moisture content and composition. Wet topsoil is significantly heavier than dry.

How many bags of topsoil do I need?

A standard 40 lb bag covers approximately 1 cubic foot. If your result is in cubic feet, that is roughly the number of 40 lb bags required. For large projects, ordering bulk topsoil by the cubic yard is far more economical.

Topsoil Calculator

Calculate how many cubic yards or cubic meters of topsoil you need to fill or cover a given area to a specified depth.

Area & Depth

Length (ft)

Width (ft)

Depth (in)

Waste Factor (%)

Summary

A free online topsoil calculator that estimates the volume of topsoil required for rectangular, circular, or triangular areas. Enter your area dimensions and desired depth, choose Imperial or Metric units, and add a waste factor to avoid running short. Results are shown in cubic yards, cubic feet, and cubic meters so you can order the exact amount from your supplier.

How it works

Select your area shape: rectangular, circular, or triangular.
Choose Imperial (feet / inches) or Metric (meters / centimeters) units.
Enter the required dimensions (length and width, diameter, or base and height).
Enter the topsoil depth you want to apply.
Optionally add a waste factor (5–10% recommended) to account for settling.
Click Calculate to see the volume in cubic yards, cubic feet, and cubic meters.

Use cases

Estimating topsoil for a new lawn or garden bed.
Calculating fill material for raised garden beds or planter boxes.
Planning topsoil topdressing for an existing lawn.
Ordering the correct volume for a landscaping or grading project.
Budgeting topsoil for vegetable garden expansion.
Computing soil needed to level or fill low spots in a yard.

Frequently Asked Questions

Last updated: 2026-05-25 · Reviewed by Nham Vu