Privacy Policy

Last updated: October 9, 2026

Bedtime Calculator does not require an account and does not ask for personally identifying information to use the sleep calculators. Calculations run in your browser. This website uses Google Analytics to understand page visits and calculator interactions, as described below.

Calculator inputs

Wake times, bedtimes, and fall-asleep buffer settings are processed in your browser to generate results. Sleep-debt targets and reported durations are also processed locally. The calculators do not save a server-side sleep history, and there is no saved sleep history, profile, or account database attached to the calculator.

Local device data

The bedtime and wake-up tools remember your entered clock times, calculator mode, clock format, and fall-asleep allowance in local browser storage. You can remove these settings by clearing this site's browser data. Sleep-debt entries are kept only while that calculator is open and are not saved between visits. Shared timing results use a URL fragment, which is not sent in normal server requests. Anyone you share the link with can see the timing settings it contains.

Cookies

The core calculators do not require cookies. This public website loads Google Analytics 4, which may use cookies or similar browser storage according to Google's practices. You can manage cookies and site storage through your browser settings. Clearing local site data removes remembered timing settings; it does not delete data already sent to analytics. The website does not currently provide an in-page analytics preference control.

Analytics

The site records page views and coarse interaction events such as calculator completion, validation type, number of nights entered, a selected target total, fall-asleep allowance, and a bucketed sleep-debt range. Individual nightly durations and entered clock times are not sent as separate event fields. Page-view events include the full page URL, so opening a shared timing link can send its fragment settings to analytics. Do not share a link whose timing settings you want to keep private.

External links

Pages such as the sleep planning guides may link to other resources over time. External sites have their own privacy practices, and this policy applies only to Bedtime Calculator.

Updates

We update this policy when the website's data practices change materially. You can also review the terms of use or return to the bedtime calculator.

Contact

Questions about this policy can be sent to support@bedtimecalculator.rest.