Privacy

Calculator inputs are processed in your browser. This version does not submit measurements, prices or project details to a database, store them in cookies, or collect lead forms. It does not load advertising or analytics scripts.

The hosting service may process normal request information such as IP address, browser details and access time to deliver and secure the site. A private preview may require hosting-provider authentication.

Correction emails

If you choose to email leonkennedy2006@126.com, your email provider and our mailbox provider process that message. The site operator receives your address and the information you send, and uses them to investigate or respond to your report. Calculator use does not send an email automatically. Do not include passwords, payment details or a private project address. You can ask the same address to remove your correspondence, subject to any information that must be retained.

Downloads and shared estimates

CSV and text exports are generated locally when you request them. A share link stores the quick-calculator values in a URL fragment. Those values are visible to recipients of the link and can remain in your browser history. The site does not upload a worksheet to a server or store it in browser local storage. Do not put private identifiers in area labels.

External reference links take you to other websites with their own privacy practices. If advertising, analytics or lead collection is enabled later, this notice must be updated and any required consent mechanism added before those services run.

Last updated: October 11, 2026.