The short version
Our calculators run entirely in your browser. The numbers you enter are processed on your device and are never sent to us or stored on our servers. We keep data collection to the minimum needed to run the site.
Information we collect
- Your calculator inputs: none. The math runs in your browser; we never receive what you type.
- Basic server logs: like most websites, our host records standard technical data (IP address, browser type, pages requested) to keep the site secure and running. These logs aren't used to identify you.
- Analytics: we may use privacy-friendly, aggregate analytics to understand which tools are useful. This measures traffic patterns, not individuals.
Cookies and advertising
We may display ads to keep the tools free. When we do, third-party vendors — including Google — may use cookies to serve ads based on your prior visits to this and other websites. Google's use of advertising cookies lets it and its partners serve ads to you based on those visits.
- Opt out of personalized advertising via Google Ads Settings.
- Opt out of many third-party vendors at aboutads.info/choices (or youronlinechoices.eu in the EU).
- You can block or delete cookies in your browser settings at any time.
Third-party links
Our guides sometimes link to other sites (suppliers, references). We're not responsible for their content or privacy practices — check their policies when you visit them.
Children's privacy
These tools are for a general audience, aren't directed at children under 13, and we don't knowingly collect personal information from them.
Changes to this policy
We may update this policy as the site grows, and we'll revise the "last updated" date above when we do.
Contact
Questions about privacy? Get in touch.