Privacy
Calculator inputs
Calculations run in your browser. Using a calculator does not submit your input values to an application server or store them in an account. You can choose to send details separately through the problem-report form described below.
Recently viewed calculators
The header and homepage can show up to three calculator pages visited in the current browser tab. Their page identifiers are kept in browser session storage; input values are not saved with this list or sent to a server. Use Clear beside Recently viewed to remove the list. If session storage is unavailable, this feature is omitted.
Sharing results
Share result creates a URL with your inputs in the fragment after the # symbol. Anyone you give that link to can view those values. They may also remain in your browser history. Do not enter private or identifying information.
Hosting
Cloudflare serves the site and may process network information, including IP addresses and request logs, to deliver and protect it. See Cloudflare’s privacy policy for its practices.
Problem reports
If you submit a problem report, the page, inputs you choose to include, description, and submission reference are sent to private Cloudflare storage for investigation. Reports are not published automatically. We do not request your name or email and cannot send a personal reply. Do not include personal information. Reports may be retained for investigation and issue records.
Cookies and analytics
With your permission, we use Google Analytics to understand page visits, traffic sources and engagement. Google Analytics uses cookies and processes technical information about your browser and device. Analytics starts only after you choose Allow analytics. You can change your choice using Cookie settings in the footer; declining keeps analytics off and does not affect the calculators. We remember your choice in this browser for six months. We do not send calculator input values or problem-report text as analytics events, and advertising personalization is disabled. Google explains its practices at Google Privacy Policy. Hosting security features may process technical data. External reference links lead to sites with their own policies.