Privacy Policy

Last updated October 11, 2026

The short version

Our calculators run entirely in your browser. What you type into them is not sent to us or stored on our servers. When you copy a “share” link, your inputs are saved in that link's address and nowhere else.

Analytics

We use analytics to understand which pages are useful, including Google Analytics, which sets cookies and collects data such as pages visited, approximate location and device type. Visitors in the EEA, UK and Switzerland are asked for consent by Google’s consent message before these cookies are set, and can change their choice at any time with “Cookie settings” in the footer. The embeddable calculator widget is not tracked.

Advertising

We show ads served by Google. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads based on those visits.

You can opt out of personalized advertising in Google Ads Settings, or opt out of some third-party vendors' use of cookies at aboutads.info. Visitors in the EEA, UK and Switzerland are asked for consent before personalized ads are shown.

Affiliate links

When you click a retailer link, that retailer may set cookies to record that you came from us. Their own privacy policies apply on their sites.

Videos

Some pages show manufacturers' videos from YouTube. Until you press play, only the preview image loads (from YouTube's image server). When you press play, the video loads from YouTube's privacy-enhanced domain, youtube-nocookie.com, and Google's privacy policy applies.

Your choices

You can block or delete cookies in your browser settings. The calculators work without cookies.

Contact

Questions about privacy: [email protected].