Calculator inputs
Numbers you type into a calculator are used to produce the result on that page. They are not stored as an account profile, because the calculators do not require one.
Measurement
If a site measurement tag is enabled, it can record pages visited and general device information. It is not required for a calculation to run.
Advertising
Pages reserve labeled advertising space. When a Google advertising tag is added later, Google and its partners may use cookies to serve and measure ads. Those spaces are marked Advertisement and sit apart from the calculator controls.
Donations
The donate link opens PayPal in a new tab. Payment details are handled by PayPal, not by this site.