Privacy policy
Short version: your calculator inputs are never collected, every calculation runs locally in your browser. The site does use Google Analytics 4 for basic traffic measurement (page views, session duration, device type, approximate location), described below.
Last updated: October 7, 2026.
What we collect
Calculator inputs: nothing. Every calculation runs locally in your browser via JavaScript. Your numbers are never transmitted to any server.
Accounts: none exist. We have no usernames, passwords, or profiles to store or leak.
Analytics: the site uses Google Analytics 4 to count page views and measure performance (page views, session duration, device type, approximate location from IP). Google may set its own cookies for this purpose per Google’s privacy policy. No advertising profile is built from this data.
Cookies
The site itself sets no tracking cookies. Google Analytics sets first-party cookies (_ga, _ga_*) to distinguish visits; these contain no personal data and expire after up to 2 years. If display advertising is introduced (the planned monetization), ad providers may set their own cookies per their policies, this section will be updated before that happens, and a consent mechanism added where required by law.
Contact emails
If you email us, we keep the message only as long as needed to respond. We never sell, rent, or share contact information.
Children
The site is a general-audience educational tool. Because nothing is collected and no accounts exist, there is no children’s data to protect, by design.
Changes
If this policy changes, the “last updated” date above changes with it. Material changes will be summarized here in plain language.