Privacy policy

Last updated October 18, 2026

We collect as little as possible. We have no accounts, no sign-ups and no forms that send your data to us.

Calculators

Our calculators run in your browser. To save you retyping, the numbers you enter may be stored in your own browser's local storage. They are never sent to us, and you can clear them at any time by clearing your browser's site data.

Advertising and cookies

This site is supported by advertising served by Google AdSense. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the Internet.

You may opt out of personalized advertising by visiting Google Ads Settings. You can also opt out of some third-party vendors' use of cookies for personalized advertising at www.aboutads.info. To learn how Google uses information from sites that use its services, see How Google uses information from sites or apps that use our services.

Visitors in the European Economic Area, the United Kingdom and Switzerland are asked for consent before personalized ads or advertising cookies are used, through a consent message shown on the site. You can change your choice at any time from the link in that message.

Site statistics

We use privacy-friendly, cookie-free statistics from our hosting provider, Cloudflare, to count page views. These do not identify you or track you across websites.

Server logs

Like any website, our hosting provider processes technical data such as IP addresses to deliver pages and protect the site from abuse.

Your rights

Depending on where you live, you may have rights to access, correct or delete personal data and to object to its use. Because we do not hold personal data about visitors ourselves, most requests are best directed to Google through the links above. For anything else, email [email protected].

Children

This site is not directed at children under 13 and we do not knowingly collect their information.

Changes

If we change this policy, we will update the date at the top of this page.