Privacy Policy

Last updated: October 2026

The short version

No accounts. No sign-ups. Your saved pool calculations are stored in your own browser's local storage — never sent to our servers.

What we collect

We use Google Analytics (GA4) to understand which calculators are popular so we can improve them. Google Analytics uses cookies and collects aggregated usage data such as pages visited and device type. This data cannot identify you personally. You can opt out with theGoogle Analytics opt-out add-on. If you email us, we receive your email address and message solely to respond.

What we never do

We never sell personal data.
We never require an account to use a calculator.
We never see the pool dimensions or readings you enter — they stay in your browser.

Cookies and storage

Saved calculations use your browser's local storage so they persist between visits on the same device. Clearing your browser data removes them. Google Analytics may set its own cookies (_ga and related) for aggregate measurement. You can block or delete cookies in your browser settings. We do not run advertising cookies on this site. Affiliate retailers may set their own cookies after you click an affiliate link, as described below.

Affiliate links

Some outbound links on this site may be affiliate links. If you click one and make a purchase, we may earn a commission at no extra cost to you. The retailer or its affiliate network may set cookies or similar identifiers to attribute the visit and purchase. We do not receive your payment details. We may participate in programs such as In The Swim (Impact), Doheny's (Ascend), Amazon Associates, and Leslie's. Each program has its own privacy policy. You can block or delete cookies in your browser; the calculators still work without them.

Changes to this policy

If we update this policy, we will update the date above. Continued use of the site after changes means you accept the updated policy. Our Terms & Conditions also apply.