Privacy Policy

Last updated: 13 November 2026

1. No personal data collected by the tool

Sleep Calculator does not ask for your name, your email address, or any personal information to calculate a bedtime or a wake-up time. There is no account, no sign-up and no login. We do not collect, store or sell personal data about our visitors.

2. Your times stay in your browser

When you type a bedtime or a wake-up time into a calculator, it is calculated on your own device in your browser. Times are never sent to our server or to any other server, and they are never stored, shared or seen by anyone.

3. Contact form

If you write to us through the contact form, we receive the name, email address and message you type, and use them only to reply to you. They are never shared, sold or added to any list, and they are never shown anywhere on the site.

4. Cookies

This site uses a cookie-consent banner. Your choice (Accept or Decline) is stored in your browser's local storage so the banner does not keep asking. No other cookies are set by Sleep Calculator itself. If you decline, only non-personalised advertising is shown.

5. Advertising — Google AdSense

This site shows advertising from Google AdSense. Google and its partners may use cookies to show ads based on your visits to this and other websites. You can opt out of personalised advertising at Google Ads Settings or at aboutads.info/choices. The AdSense script is loaded on every page; it renders no ads by itself — ads appear only when Auto ads is enabled in the AdSense account.

6. Third-party services

Sleep Calculator loads no third-party tracking, analytics or social-media scripts. The only third-party code is the Google AdSense script described above.

7. Children's privacy

Sleep Calculator is a general-purpose tool site. We do not knowingly collect personal information from children under 13, or from anyone at all through the calculators themselves — the tools collect no personal data from any visitor.

8. Changes to this policy

If this policy changes, the new version will be posted on this page with a new “last updated” date. Continued use of the site after a change means you accept the new policy.

9. Contact

Questions about this policy: please use the contact form.