Sleep Calculator
Find your ideal bedtime or wake‑up time using 90‑minute sleep cycles. Wake up refreshed, not groggy.
Suggested bedtimes for a 07:00 wake‑up:
💡 Sleep Cycle Tip: A full sleep cycle lasts ~90 minutes. Waking up between cycles (after 1.5, 3, 4.5, 6, 7.5, or 9 hours of sleep) is recommended to feel refreshed. The times above include your {{fallAsleep}}‑minute fall‑asleep window.
Frequently Asked Questions
Is this tool free to use?
Yes, all our tools are completely free to use with no hidden charges or subscriptions.
Is my data secure?
Absolutely. We prioritize your privacy. Most of our tools process data locally in your browser, meaning your data never leaves your device.
Do I need to install any software?
No installation is required. Our tools are web-based and work seamlessly in any modern browser on both desktop and mobile.
Can I use this tool on my mobile device?
Yes, our website is fully responsive and optimized for mobile devices, tablets, and desktops.