Terms of Use

Last updated: October 25, 2026.

Estimates only

All calculators provide planning estimates based on the numbers you enter and standard assumptions stated on each page. They are not professional quotes, engineering calculations or building-code advice. Always verify quantities against the coverage and instructions of the actual products you buy, your local building code, and, for structural work, a qualified professional.

No warranty

The tools are provided free of charge, as is, without warranties of any kind. We are not liable for material shortages, overages, project delays or other losses arising from use of the estimates.

Acceptable use

You may use and link to the calculators freely for personal and commercial project planning. You may not present the tools themselves as your own product or scrape the site in a way that burdens it.