Terms & estimation limits

What the tools provide

The calculators apply the formulas shown on each page to measurements and assumptions supplied by you. Their output is an estimate of quantity, not a quote, purchase order or guarantee of adequate material. Verify measurements, product specifications, cutting requirements and supplier purchase increments before ordering.

Excluded decisions

Concrete calculations do not recommend thickness, foundations or structural capacity. Gravel and soil calculations do not design drainage or compaction. Paint does not assess product suitability. Flooring, tile and drywall use area estimates rather than cutting or installation plans. Wallpaper supports only the match models described on its page.

No tool provides engineering, construction safety or regulatory approval. The estimate does not replace project-specific assessment where it is required.

Saved work and compatibility

You identify which products and characteristics must match. Exact text and numerical checks help keep products separate but cannot identify an omitted batch, finish, grade or other real-world difference. Stock refers to complete usable packages, sheets or rolls. Keep a downloaded copy of important work; local storage is not a backup service.

Availability

The tools are available without an account, purchase or subscription. Availability may change and saved browser data may be lost if site data is cleared. Download a backup of important material lists. These terms do not override any rights that cannot lawfully be excluded.