Small tool. Growing plans.

Topsoil Calculator helps turn measured spaces into a clearer conversation with your soil supplier.

What the tool does

Estimate volume for rectangular beds, circles or known areas; combine separate spaces; add a chosen allowance; compare whole bags and bulk order increments. Optional supplier density and entered prices add weight and material-cost estimates.

What the tool represents

This is an independent calculator, not a soil supplier, landscaping contractor or certification service. The publisher is Topsoil Calculator. No trade credentials, project reviews or supplier relationships are claimed.

Accuracy you can inspect

The calculation method is visible, with independent worked examples and tested boundary cases. Exact rational arithmetic avoids binary floating-point errors in rectangular bag and supplier-increment calculations. Tests describe observed software behavior; they do not prove a zero real-world mistake rate. Measurement quality and soil properties still matter.

Read the complete method and limitations. If something looks wrong, send a reproducible correction.

Privacy by design

The calculator runs in your browser without a calculator API, account or database. Download a CSV for your records, print the estimate, or create a link that encodes the measurements you choose to share.

Last revised 2026-10-19.