The calculator runs entirely in your web browser. The measurements you type are never sent to us or stored anywhere. Close the page and they are gone.
If you write to us or join the Reader Club letter, we receive your email address because you sent it. We use it only to answer you or send the letter. We do not sell email addresses, and you can ask to be removed at any time by replying to any note.
This site is served by GitHub Pages. Like any web host, GitHub may keep standard server logs (for example, which pages were requested) under its own privacy policy.
If advertising is added to this site in the future, this page will be updated first to say so, and to explain what it uses.
Write to hello@mabelquinnbooks.com and a person will answer.