Privacy Policy
Last updated: October 13, 2026
The short version
VarianceCalc performs every calculation locally in your browser. The numbers you paste or type are never sent to, processed by, or stored on our servers — that data never leaves your browser. This site shows ads through Google AdSense, which may use cookies to serve and measure ads; see the "Advertising" section below for details.
Your calculator data
The dataset you enter into the calculator stays in your browser's memory and is never transmitted anywhere automatically. The only exception is if you explicitly click "Copy link" to share a result — that action encodes your data and selected mode into the page URL (as ?d= and?m= query parameters) so it can be shared or bookmarked. Simply typing, pasting, or editing data never changes the address bar on its own.
Local storage
We use your browser's local storage to remember one thing: your light or dark theme preference. This stays on your device and is never transmitted to us.
Server logs and hosting
Like any website, our hosting provider may automatically log standard technical information for security and reliability purposes — such as IP address, browser type, and request timestamps — for pages you request. This is standard web server behavior and is not tied to any calculator data, which never leaves your browser.
Advertising
This site shows ads served by Google AdSense. Google and its advertising partners may use cookies and similar technologies to serve ads based on your prior visits to this or other websites, and to measure ad performance. This advertising activity is separate from the calculator itself — your calculator data is never shared with or used by any advertiser, because it never leaves your browser in the first place. You can learn more about how Google uses data, and opt out of personalized advertising, atGoogle's Ads Policy page and atGoogle Ads Settings.
Cookies
Beyond the local theme preference described above, this site uses cookies associated with Google AdSense, as described in the "Advertising" section above.
Third parties
We do not sell, rent, or share your calculator data with third parties, because we do not collect any calculator input to begin with. Google AdSense, described above, operates independently of the calculator and has its own privacy practices. If this ever changes — for example, if we introduce analytics — we will update this policy accordingly.
Children's privacy
This site is a general-purpose calculator and does not knowingly collect personal information from anyone, including children.
Changes to this policy
If this policy changes, we will update this page and revise the "Last updated" date above.
Contact
Questions about this policy? Visit ourContact Us page.