Last updated: October 2026. By using this website, you agree to the following terms.
The calculators give estimates, not professional advice
Every calculator and guide on this site provides planning estimates based on standard sizes, typical product dimensions and common rules of thumb. Results are for early planning only. They are not a quote, a bill of quantities, a design, or professional advice. Always confirm final measurements on site before ordering materials, cutting anything, or signing a contract. Product sizes vary by manufacturer; energy prices and material costs vary by location and change over time.
Your responsibility
You are responsible for how you use the results. For structural changes, electrical work, gas work, plumbing and roofing, hire a licensed professional and follow your local building codes and permit rules. If a calculator result and a professional’s advice differ, follow the professional.
Accuracy and availability
We work to keep calculators and content accurate and up to date, but we make no warranty that results are error-free or that the site will always be available. Use of the site and its tools is at your own risk. To the fullest extent allowed by law, we are not liable for losses arising from decisions made using estimates from this site.
Content and intellectual property
The text, calculators and design on this site belong to us or are used with permission. You may link to our pages and quote short extracts with credit and a link. Copying calculators, articles or substantial parts of the site without written permission is not allowed.
External links
We sometimes link to other websites for reference. We do not control or endorse their content, prices or practices.
Changes
We may update these terms; the current version on this page applies. Continued use of the site means you accept the updated terms. Questions about these terms can be sent through the Contact Us page.