Privacy policy
Short version: no accounts, no personal data, the calculators run on your device.
What we collect
Nothing that identifies you. There are no accounts and no sign-ups. The calculators run entirely in your browser, and your inputs are not sent to us. To remember your tub volume across the calculators, the site stores that one number in your browser's local storage on your own device; it never leaves your device and you can clear it any time by clearing site data.
Analytics
We use privacy-respecting, aggregate analytics to see which pages and tools are used, so we can improve them. This records general, non-identifying usage such as page views and which calculator was used. It is not tied to a name or account, and we do not sell data.
Affiliate links and cookies
Some links are affiliate links, including Amazon. As an Amazon Associate this site earns from qualifying purchases at no extra cost to you. When you follow one, the retailer may set its own cookies under its own privacy policy, which we do not control. Following an affiliate link is optional and changes nothing about the information on the page.
Contact
Questions about privacy: contact@hottubcalc.com. Last updated 2026-06-13.