Sleep Calculator – Bedtime & Wake Up Time Calculator

Sleep Calculator

Use this free Sleep Calculator to find recommended bedtimes and wake-up times based on 90-minute sleep cycles. Getting enough sleep and waking between sleep cycles may help you create a more consistent sleep schedule.

How to Use the Sleep Calculator

1. Choose whether you want to calculate your bedtime or wake-up time.
2. Select your preferred time.
3. Click the Calculate button.
4. The calculator will show recommended times based on sleep cycles.

What Is a Sleep Cycle?

A typical sleep cycle is often estimated at around 90 minutes. People usually go through several sleep cycles during a night. This calculator uses an approximate cycle length to provide suggested times.

Important Note

This calculator provides general estimates for planning your sleep schedule. Individual sleep needs and sleep-cycle lengths can vary. It is not medical advice.

Frequently Asked Questions

How many hours of sleep should I get?

Sleep needs vary by age and individual circumstances. Most adults generally need around 7 to 9 hours of sleep per night.

What is the 90-minute sleep cycle?

Sleep cycles are commonly estimated at around 90 minutes, although actual cycle length can vary from person to person and throughout the night.

Does the calculator guarantee better sleep?

No. The calculator provides estimated times only. Maintaining a regular sleep schedule and getting adequate sleep are more important than precisely timing individual sleep cycles.