Privacy policy

Last updated September 15, 2026

Sumwell calculators run entirely in your browser. The numbers you type are not sent to or stored on our servers.

Advertising and cookies

This site shows ads from third-party vendors, including Google. These vendors use cookies to serve ads based on your previous 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.

You can opt out of personalized advertising at Google Ads Settings, or opt out of some third-party vendors' cookies at aboutads.info.

Analytics

We may use privacy-respecting analytics to count page views and improve the calculators. This data is aggregated and not used to identify you.

Contact

Privacy questions: hello@sumwellcalc.com