Privacy

Privacy

Updated November 3, 2026

What passes through the site

• What you type into the calculator — sizes, thickness and options — is worked out inside your browser and never reaches us.
• Visit counts may be gathered with cookie-free analytics that can't tell who you are.
• Server logs (IP address, browser type) are processed by Cloudflare, which hosts the site, to serve the pages and guard against abuse.

There is no account to create, no form that asks for your contact details and no advertising cookie.

Phone calls

Should you call a number shown here, a call-routing network puts you through to an independent contractor. They get your phone number and may record the call, and their own privacy policies govern what happens to it.

Email

A message you send to [email protected] is used for one thing only: replying to you.

Questions

Use the contact page.