Privacy Policy

Last updated: March 23, 2026

This policy describes how Sleep Calculator Tool (“we,” “us”) handles information when you use this website. We aim to be transparent about analytics, advertising, and cookies.

What we collect

This calculator does not require account creation. We do not intentionally collect personal data that you type into wake-time or bedtime fields for storage in our own database—those calculations are meant to run in your browser as described below.

How the calculator works

Sleep cycle calculations are processed in your browser (client-side). We do not operate a login system on this Site for saving your schedules to our servers.

Analytics

We use Google Analytics (Google tag / gtag) to understand aggregate traffic—such as page views, general geography, and device types—so we can improve the Site. Google may collect identifiers and usage data subject to Google’s policies. You can learn more in Google’s Privacy Policy and use browser add-ons or settings to limit analytics where available.

Advertising and cookies

We may display ads using Google AdSense and other advertising partners. These vendors may use cookies, local storage, or similar technologies to serve personalized or non-personalized ads, cap how often you see an ad, measure performance, and reduce fraud.

Typical categories include:

  • Essential / functional: needed for basic Site operation or your cookie choices where applicable.
  • Analytics: helps us see which pages are used and how the Site performs.
  • Advertising: used by ad networks to show and measure ads.

You can manage ad personalization in Google Ads Settings and control or delete cookies through your browser. Industry opt-out tools (where available in your region) may also help limit interest-based advertising.

Third-party services

Hosting providers, analytics tools (such as Google Analytics), and advertising platforms may log technical data such as IP address, browser type, approximate location, referrer, and timestamps for security, billing, and performance. Those parties process data under their own terms.

Retention

We do not maintain a user account database on this Site for your sleep inputs. Data retained by third parties (analytics, ads, hosting) is governed by their retention practices and your choices where applicable.

Children’s privacy

The Site is not directed at children under 13 (or the minimum age in your jurisdiction). We do not knowingly collect personal information from children for targeted marketing. If you believe we have received such information, contact us via the Contact page.

Your rights

Depending on where you live, you may have rights to access, correct, delete, or restrict certain processing of personal data, or to object to certain uses. Because much of the data here is processed by third parties (Google, ad networks, host), you may need to exercise some choices directly with those services or through browser and device settings.

International transfers

Third-party providers may process data in the United States or other countries. When data moves across borders, it may be subject to the laws of those jurisdictions.

Policy updates

We may update this Privacy Policy from time to time. The “Last updated” date will change when we do. Continued use of this Site after an update means you accept the revised policy for new activity going forward.

Contact

If you have privacy questions, use the contact details on the Contact page.