A small tool with a small data footprint

Calculator preferences may be saved in local storage in your browser so the tool can remember simple choices such as a wake time or routine length. You can clear this data through your browser settings.

The application does not currently include advertising, analytics profiles, authentication, or a database. If third-party analytics or advertising is introduced later, this notice and any required consent controls will be updated before those services are enabled.

Hosting providers may process standard technical request information, such as IP addresses and user-agent strings, to deliver and secure the website.

Last updated: June 15, 2026.