SITE INFORMATION

Terms of use

These tools are provided for general project planning. By using them, you acknowledge that results depend on your inputs and the published assumptions.

No project contract

A calculation is not an offer to perform work, a contractor quote, a warranty or professional advice. Verify quantities, specifications and costs before ordering materials or hiring a contractor.

Availability and accuracy

We may update formulas, content and sources. We do not promise uninterrupted availability or that a national range will reflect your project. Errors should be reported through the contact page.

Responsible use

Do not interfere with the site or misrepresent its results as a professional inspection or binding estimate. Third-party sources are credited and remain subject to their owners’ terms.