Calculator inputs
Calculations run in your browser. We do not send your measurements, prices, area names, or results to a server. Copy and print use your device's browser features.
Feedback and email
The feedback form opens a draft in your email app. Nothing is sent until you choose to send that message. If you email us, we receive the information you include and your email address so we can read and, if appropriate, reply. Please do not include sensitive information.
Optional analytics
If you choose “Allow analytics,” we load Google Analytics to count page visits and understand which pages are useful. Google may receive your page address without its query string, page title, browser and device information, approximate location, and IP address as part of the request. Analytics cookies may be stored on your device. We do not send calculator inputs, prices, area names, or results to Analytics, and we do not use it for advertising personalization. See Google's Privacy Policy for how Google handles data.
If you decline, the Analytics script does not load. Your choice is saved in this browser. You can change it at any time: . Declining after allowing analytics stops further tracking on this site and clears this site's Analytics cookies, but cannot undo data already sent.
Site operation
A hosting provider may process basic request information needed to serve the pages and keep them secure.
Questions
Contact [email protected] about information you sent us, including a request to delete it.