Nothing. The calculators run entirely in your browser. The dimensions you type are never transmitted, never logged and never stored.
The web server keeps standard access logs — IP address, timestamp, requested URL, referrer and browser user-agent. These are used to keep the site running and to detect abuse. They are not used to build a profile of you.
This site does not currently display advertising. The rest of this section describes what will apply if and when it does.
This site intends to show advertising supplied by Google. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visit to this site and other sites on the internet.
You can opt out of personalised advertising by visiting Google's Ads Settings at adssettings.google.com. You can also opt out of a third-party vendor's use of cookies for personalised advertising at aboutads.info.
No advertising is served on this site at present. Before any advertising is enabled, a Google-certified consent management platform will be in place for visitors in the European Economic Area, the United Kingdom and Switzerland, as Google's EU user consent policy requires.
If and when analytics are added, this page will name the provider and say what it records, before the provider is enabled.
Material changes to this policy will be noted on this page rather than made silently.