Last updated: September 2026
What you enter in the calculators
All calculations run in your browser. The numbers you type are saved only in your browser's local storage so the tools can remember your last values. They are never sent to or stored on our server. You can clear them at any time by clearing your browser's site data.
Advertising
This site may show ads served by Google AdSense. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the internet.
You can opt out of personalised advertising by visiting Google Ads Settings, or opt out of some third-party vendors' use of cookies at aboutads.info. Learn more about how Google uses information from sites that use its services.
Affiliate links
Some pages may contain referral (affiliate) links. If you sign up or buy through them, I may earn a small commission at no extra cost to you. This never changes how the calculators work.
Analytics and logs
Like most websites, the hosting provider may keep standard server logs (such as IP address, browser type and pages visited) for security and performance.
Children
This site is not directed at children under 13.
Changes and contact
This policy may be updated from time to time. Questions? See the About & contact page.