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Frequently Asked Questions
Quick answers to the questions people ask most about the calculators, privacy, and offline use.
How accurate is the age calculator?
Very accurate. The age calculator performs exact calendar arithmetic and reports your age in years, months, days, and smaller units — down to the second when a birth time is provided. Results are exact for the documented leap-year conventions.
How are leap years handled?
The calculator follows a documented convention: someone born on February 29 has their birthday recognized on February 28 in non-leap years when age in years is calculated. This is a standard convention and is explained on the Disclaimer page.
What is sleep latency?
Sleep latency is the time it takes you to fall asleep after getting into bed. The Sleep Calculator uses a default latency of 15 minutes, and you can adjust it to match your own experience.
Why 90-minute sleep cycles?
Sleep alternates between light, deep, and REM stages in cycles that average roughly 90 minutes in adults. The calculator aligns suggested bedtimes and wake times to those cycle boundaries. Individual cycles vary, so the results are estimates, not prescriptions.
Is this medical advice?
No. The calculators provide estimates for general informational purposes only and are not medical advice. If you have concerns about your sleep, please consult a qualified professional. See the Disclaimer for details.
Do you store my data?
No. All calculations run locally in your browser, and your inputs are never transmitted or stored anywhere. The only thing saved on your device is your theme preference. See the Privacy Policy for the full details.
Does it work offline?
Yes. The site is a progressive web app (PWA). After your first visit, pages and calculators are cached by a same-origin service worker, so the tools keep working even with no internet connection.
How does dark mode work?
A theme toggle switches between light and dark. Your choice is remembered in your browser's local storage under the key ascc-theme, so it persists across visits. No personal data is involved.
Do you use cookies?
No cookies, ever. There are no tracking, advertising, or analytics cookies — in fact, no analytics at all. You can read more on the Cookies page.
Can I use it on mobile?
Yes. The site is fully responsive and works on phones and tablets. You can also install it to your home screen like an app, and it keeps working offline.
Did not find your answer? See Help for step-by-step guides, or email minitoolszz@gmail.com.