Sleep Calculator: Find Your Ideal Bedtime or Wake-Up Time
Use this free sleep calculator to estimate when to go to bed or wake up. It uses approximate 90-minute sleep cycles and allows about 15 minutes to fall asleep. Sleep cycles vary, so treat results as a planning guide, not a medical prediction.
Calculate Your Sleep Schedule
How to Use the Sleep Calculator
- Choose a bedtime or wake-up time.
- Select your preferred time.
- Compare estimates for four, five, or six approximate sleep cycles.
- Keep a consistent schedule and allow enough time for sleep.
How Much Sleep Do You Need?
Most adults need at least seven hours of sleep regularly. Sleep needs vary by age and individual factors. Sleep quality and consistency matter too. This calculator cannot diagnose sleep problems or replace professional medical advice.
Frequently Asked Questions
Are sleep cycles exactly 90 minutes?
No. Sleep cycles vary in length and between people. Ninety minutes is only a rough estimate.
Will this guarantee I wake up refreshed?
No. How rested you feel depends on total sleep, sleep quality, body clock, and other factors.