Choose a mode to calculate your best bedtime or wake-up times.
What do you want to calculate?
Selected wake-up time: --:--
Selected bedtime: --:--
This mode estimates your best wake-up times if you go to sleep now.
A full sleep cycle is around 90 minutes. A good night's sleep is usually 5-6 complete cycles.
Sleep Calculator Tool helps you pick better bedtimes based on complete sleep cycles so you can wake up feeling more refreshed.
Is this medical advice? No, this is a planning tool only.
Why do results cross midnight? Bedtimes are calculated backward from your chosen wake-up time.
Does this include time to fall asleep? Yes, the sleep-now mode includes a short 15-minute fall-asleep buffer.
Which option is best: 4, 5, or 6 cycles? Aim for 5 to 6 full cycles when possible; 4 cycles is a shorter-night fallback.