Free Online Sleep Calculator (Bedtime and Wake-Up Time by Sleep Cycles)

Sleep Calculator

Find your best bedtime or wake-up time using sleep cycles • 100% free • Runs in your browser

1. Tell us your plan

What do you want to calculate?

Mode I need to wake up at... (find my bedtime) I will go to bed at... (find my wake-up time) I am going to sleep right now Wake-up time

Fine tuning

Time to fall asleep (minutes)

Most people need 10 to 20 minutes to fall asleep.

Length of one sleep cycle 80 minutes 90 minutes (average) 100 minutes 110 minutes Clock format 12-hour (AM / PM) 24-hour

2. Your best bedtimes Click a card to build your evening routine

Waking up at the end of a sleep cycle usually feels easier than waking up in the middle of one. Adults generally need 7 to 9 hours of sleep.

3. Evening routine for the selected bedtime

4. Nap planner

When will you lie down?

Nap start time

Wake-up times include the minutes you need to fall asleep.

All processing happens in your browser. This tool gives general guidance only and is not medical advice. If you often feel tired or have trouble sleeping, talk to a doctor.