Legal
Privacy Policy
Last updated: August 25, 2026
1. Who is responsible
Sleep Time Calculator is the operator of calculatorsleeptime.com and is responsible for the site-level processing described in this policy. Privacy questions and requests can be sent to [email protected].
2. Information we handle
| Information | How it is used | Where it is kept |
|---|---|---|
| Calculator inputs (bedtimes, wake-up times, time zones, sleep log entries) | To compute your results on screen. | Only in your browser's memory; discarded when you close the page. |
| Messages you send us | To answer support, privacy, or correction requests. | Our email inbox for as long as reasonably needed to handle the request. |
| Basic server and security logs | To deliver pages, maintain security, diagnose faults, and prevent abuse. | Our hosting and delivery providers, subject to their retention settings. |
| Anonymous usage data (Google Analytics) | To count visits, see which pages are used, and improve the site. | Processed by Google under their privacy policy; we do not store it ourselves. |
| Advertising data (Google AdSense) | To show, limit, and measure ads that keep the site free. | Processed by Google and its advertising partners; we do not store it ourselves. |
3. What we do not collect
We do not ask for your name, email address, or any sign-up. Because the calculators are client-side, we have no access to the sleep times you enter. The site loads Google Analytics and Google AdSense, as described below.
4. Analytics
We use Google Analytics (measurement ID G-9DPVZ22YJC) to understand anonymous site usage — for example, which pages are visited and how the tools perform. Google may process technical data such as IP address, device and browser details, and page activity. You can limit this through browser settings or Google's Analytics opt-out. Learn more in Google's privacy policy.
5. Advertising and Google AdSense
We use Google AdSense (publisher ID ca-pub-4994924685307974) to display advertising that helps keep this site free. Third-party advertising partners, including Google, serve ads on our pages.
5a. Third-party cookies, web beacons, and identifiers
Third-party advertisers and advertising networks — including Google and its advertising partners — use cookies, web beacons (also called pixels or tracking pixels), and similar identifiers on this website to deliver ads, limit how often you see the same ad, measure ad performance, detect fraud and invalid traffic, and, where permitted, personalize ads to your interests (interest-based advertising). These cookies and identifiers are set by those third parties, not only by us.
Through those cookies, web beacons, and identifiers, third parties may collect information such as your IP address, browser and device type, the pages you visit on this site, the time of your visit, and how you interact with ads. We do not send calculator inputs, email addresses, or other personal identity details into advertising requests.
You can review or opt out of interest-based ads from Google at adssettings.google.com. Industry opt-out tools are also available at aboutads.info/choices. You can also block or delete cookies in your browser settings; some site features and ads may then work less well.
Learn more about Google's advertising technologies and how Google uses information from sites that use its services.
6. Purposes and legal bases
Where data protection law requires a legal basis, we rely on: performance of a service you request for the calculators you choose to use; legitimate interests for limited site security, error diagnosis, and responding to ordinary messages; legitimate interests for Google Analytics traffic measurement; and consent for advertising where required.
7. Sharing and international transfers
We use hosting and content-delivery providers to operate the site. They may process limited technical data on our behalf. Google Analytics and Google AdSense may also receive the data described above. Because these services may operate globally, information may be processed outside your country under the safeguards described in each provider's own privacy notice.
8. Retention
Calculator inputs exist only while the page is open. Support correspondence is kept only as long as reasonably necessary to handle the request and meet record-keeping duties. Operational logs follow the retention controls of our hosting providers.
9. Your privacy rights
Depending on where you live, you may have rights to access, correct, delete, or receive your personal information; to restrict or object to processing; to withdraw consent; and to complain to your local data protection authority. California residents may also have rights to know, delete, and correct covered personal information and to opt out of sale or sharing. Sleep Time Calculator does not sell personal information.
Send a request to [email protected]. We may ask for enough information to verify the request.
10. Children
The site is intended for a general audience and is not designed to collect personal information from children. We do not knowingly create child profiles or ask children to submit personal details. If you believe a child has sent us personal information, contact us so we can review and delete it where appropriate.
11. Security and policy changes
We use reasonable technical and organizational measures to protect the site, but no internet service can guarantee absolute security. We may update this policy when our services, providers, or legal obligations change. Material changes will be reflected by the updated date shown above.
12. Contact
Privacy questions and general questions: [email protected]