Summary

Every calculator on this site runs entirely in your browser. The numbers you type are never sent to a server, never stored by us, and never seen by anyone else.

What we collect

Calculator inputs. Nothing. All computation happens in JavaScript on your device. No input is transmitted.

Local storage. Some tools save your last inputs in your own browser's local storage so the form is prefilled on your next visit. This data stays on your device and can be cleared at any time through your browser settings.

Server logs. Our hosting provider records standard request information such as IP address, browser type, referring page and timestamp. This is used for security and aggregate traffic analysis.

Cookies and advertising

This site may display advertising served by third-party vendors, including Google. Those vendors may 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 visit to this site and other sites on the internet.
• You may opt out of personalised advertising by visiting Google Ads Settings.
• You can also opt out of third-party vendor cookies for personalised advertising at aboutads.info.
• Third-party vendors and ad networks may also use non-personalised advertising, which does not rely on your browsing history.

Analytics

We may use privacy-respecting, aggregate analytics to understand which pages are useful. These tools do not build individual user profiles and do not track you across other websites.

Your rights

Because we do not collect personal data through the calculators, there is generally nothing for us to export or delete. If you are in the EEA, the UK, Switzerland, California or another jurisdiction with data protection legislation, you retain the right to access, correct, delete or restrict processing of any personal data we hold. Contact us using the address below and we will respond within the period required by applicable law.

Children

This site is not directed at children under 13 and we do not knowingly collect data from them.

Changes to this policy

If this policy changes, the updated version will be posted on this page with a new date. Material changes will be noted at the top of the page.

Contact

Questions about this policy: 18085243556@163.com

This page is provided for transparency and to satisfy advertising network requirements. It is not legal advice; consult a qualified professional for your jurisdiction.