The short version: type a number into a calculator here and it never leaves your device. The rest of this page covers cookies, ads, and outbound links, which work the way most free sites work.
Every calculator on MathCalcTools, from the square root tool to the derivative calculator, runs its math in JavaScript inside your own browser. There is no submit button that sends your inputs anywhere, because there is nowhere for them to go. Close the tab or refresh the page and whatever you typed is gone. We do not log calculator inputs, and we could not reconstruct them if we wanted to.
A banner at the bottom of the screen asks whether you want to accept or reject non-essential cookies before any analytics or ad scripts load. Your answer is stored in your own browser's local storage, not on our servers, and it controls whether the tags below fire at all. If you have not made a choice yet, essential site function still works normally; you just will not see personalized ads until you decide.
MathCalcTools carries ads through Google AdSense. If you accept cookies, Google and its ad partners may use them to show ads based on your visits here and elsewhere on the web. You can review and adjust ad personalization directly in your Google account settings at any time, independent of the cookie banner on this site.
A handful of links, mostly in the footer, are affiliate links. Following one and making a purchase can earn this site a small commission, at no added cost to you. That relationship never changes what a calculator on this site computes; the math and the monetization are unrelated.
Send them through the contact page. For how the site's editorial content gets checked and corrected, rather than how data is handled, see editorial standards instead.