Privacy
All calculations run in the browser. SellMath never sends the numbers you enter.
Calculator inputs stay local
The site does not send calculator inputs or results anywhere. It has no accounts, forms that submit data, advertising scripts, or third-party embeds.
Google Analytics
SellMath uses Google Analytics 4 to understand aggregate usage, such as which pages are visited, referring sites, approximate location, and device type. Google Analytics sets cookies and receives your IP address and browser details, processed by Google under its own privacy policy. Calculator values are not sent.
Cookie consent
SellMath uses Google Consent Mode. For visitors in the European Economic Area, the United Kingdom and Switzerland, analytics cookies are off by default and a banner asks for your choice; Google Analytics is only allowed to set cookies after you select Accept. To decide whether to show the banner, your browser asks this site’s host (Cloudflare) for your approximate country; if that check fails, the banner is shown. For visitors elsewhere, analytics is on by default without a banner. Advertising storage is always denied. Wherever you are, you can change or withdraw your choice at any time with the “Cookie settings” link in the footer. You can also block analytics with browser privacy settings, a content blocker, or the Google Analytics opt-out add-on.
No saved entries
SellMath does not save calculator values between visits. The only item it stores in your browser’s local storage is your cookie choice (key sm-consent). Your browser may independently restore form values using its own settings.
Static hosting
Your browser requests the HTML, CSS, and JavaScript files from the host serving this site. A hosting provider may keep standard request logs, such as IP addresses and requested file paths, under its own policies. Calculator entries are not included in these requests.
External resources
The only third-party script is Google Analytics. The site does not load external fonts or CDN libraries. Official source links open only when you choose to follow them.
Policy date: October 2026.