What you type
The calculators run in your browser. The measurements, prices and other numbers you type are not sent to us or to anyone else. The calculator pages make no network requests.
What stays on your device
The site saves two things in your browser's local storage, and only these two: your choice of units (imperial or metric), under the name ct-units, and your choice of light or dark theme, under the name theme. The theme is saved only after you switch it. The calculator does not save any number you type, such as measurements, the waste percentage or prices. Both settings stay on your device and are not sent anywhere. You can clear them in your browser settings, and the calculators work without them.
Cookies, accounts and tracking
The site sets no cookies, has no accounts or forms, and runs no analytics or tracking scripts.
Hosting
The site is delivered by Cloudflare. Like any web host, Cloudflare handles technical request data, such as your IP address, in order to deliver pages and protect the site. See Cloudflare's own privacy policy for details.
Ads and affiliate links
The site shows no ads and no affiliate links today. If we add them, they may use cookies or similar technology, and we will update this page to describe them exactly before they go live.
If you email us
If you write to [email protected], we receive your email address and your message, and we use them only to read and answer your message.