Yes, completely free. CalculateSleep will always be free to use. The site is supported by non-intrusive advertising through Google AdSense.
No. All calculations happen entirely in your browser. We never receive, store, or have access to any times you enter into the calculator.
Email us at panoramaholdings01@gmail.com with a description of the issue, your browser and device type, and a screenshot if possible. We'll investigate and fix it as quickly as we can.
Absolutely — we love hearing ideas from users. Send your suggestion to our email and we'll consider it for a future update. Popular requests get prioritized.
CalculateSleep is an independent project operated from Pakistan, built to help people wake up feeling refreshed using sleep cycle science. It is not affiliated with any medical institution.