Last updated: March 2025
CalcStack.tools provides free online calculators. This policy explains what data we collect and how we use it. We collect as little as possible.
All calculations happen entirely in your browser. We do not store, transmit, or process any numbers you enter. No calculation data ever leaves your device.
We use Google Analytics to understand how visitors use the site (pages visited, time on site, general location by country). This data is anonymised and aggregated. No personally identifiable information is collected.
We use Google AdSense to display advertisements. Google may use cookies to serve ads based on your prior visits to this and other websites. You can opt out of personalised advertising at google.com/settings/ads.
We use analytics cookies (Google Analytics) and advertising cookies (Google AdSense). You can control cookies through your browser settings.
We use Google Analytics, Google AdSense, and Cloudflare (hosting). Each has their own privacy policy.
You may have rights to access, correct, or delete personal data depending on your location. Most requests can be addressed by clearing browser cookies. Contact us via the About page for queries.
CalcStack.tools is not directed at children under 13. We do not knowingly collect data from children.
We may update this policy occasionally. The "Last updated" date above will reflect any changes.