What is a Sleep Calculator?

A Sleep Calculator estimates ideal bedtimes and wake-up times based on natural sleep cycles, helping you plan a more consistent sleep schedule.

How long is one sleep cycle?

A typical sleep cycle lasts about 90 minutes, although the exact duration varies between individuals.

Why do I feel tired after sleeping eight hours?

You may have woken during deep sleep, experienced poor sleep quality, or had interruptions during the night. Sleep timing and consistency also influence how rested you feel.

Sleep Calculator: Calculate Your Ideal Sleep Schedule

Sleep Calculator: Find Your Best Bedtime & Wake-Up Time