The short version
Everything you type into a calculator stays in your browser. Calculations run entirely on your device — inputs and results are never stored on, or transmitted to, our servers. The only data we collect is standard, anonymous website analytics.
Information we collect
- Analytics data: we use Google Analytics to understand which calculators are popular and how the site is used, so we can improve it.
- Advertising data: we use Google Ads to display advertisements that fund this free service and to measure ad performance.
- Technical data: browser type, device class, approximate location (country/city level) and pages visited — collected by the services above, not by us directly.
What we never collect
- Your calculator inputs or results — these are processed locally and never leave your device.
- Names, email addresses or accounts — the site has no sign-up and no forms that submit data.
- Shared links: if you copy a "link to this calculation", the inputs are encoded in the URL you chose to copy — nothing is sent to us.
Cookies
- Google Analytics cookies — anonymous usage measurement.
- Google Ads cookies — ad relevance and performance measurement.
- Local preferences — your light/dark theme choice is saved in your browser's local storage, not a tracking cookie.
Third-party services
- Google Analytics — traffic measurement (Google Privacy Policy)
- Google Ads — advertising (Google Privacy Policy)
No other third-party scripts, fonts, CDNs or trackers are loaded by this site.
Your choices
- Opt out of Google Analytics with the opt-out browser add-on.
- Control ad personalisation at Google Ads Settings.
- Block or clear cookies in your browser settings — every calculator keeps working without them.
Contact
Questions about this policy? Reach us via the contact page.