Terms of use
Last updated 2026-11.
Estimates, not professional advice
Calculators give estimates for planning and buying materials. They are not engineering, structural or building-code advice. Check plans, loads, soil conditions and local codes with a qualified professional.
No warranty
We test every calculator, but results depend on your inputs and on real-world conditions. The site is provided as is, without warranty of any kind.
Use of the site
You may use the calculators freely for personal and commercial projects. Do not copy the site's content wholesale or attempt to disrupt the service.