Terms of use
The calculators are free to use. They are a reference for planning, and you are responsible for how the results are used.
Reference, not approval
Results describe geometry from the numbers you enter and the model code we cite. They are not an engineering design, a permit document or a guarantee that a build will pass inspection. Check the requirements in your area and get professional advice where the work is structural or the stakes are high.
No warranty
We test carefully, but the site is provided as is. To the extent the law allows, Stair & Roof is not liable for losses from using or relying on the calculators, including wasted material or rework.
Using our content
You may link to any page and share results freely. Please do not copy the pages or the calculators wholesale onto another site.
Changes
We may update these terms; the date below shows the current version. Questions go to [email protected].
Last updated 2026-11-05.