Free wake-up calculator
When should I wake up?
Going to bed now? Find suggested alarm times based on estimated sleep cycles, then choose a result that gives you enough total sleep.
Calculate your wake-up time
The live calculator uses your current device time, adds a 15-minute buffer and displays several alarm options.
Calculate wake-up timesChoosing an alarm time
Do not simply choose the first available result. Compare the total sleep shown with each option. For most adults, sufficient sleep is more important than trying to hit an exact 90-minute boundary.
Allow time to fall asleep
The tool allows 15 minutes as a convenient default. If you normally need 30 minutes, mentally add that difference or start your wind-down earlier.
Keep your schedule consistent
A regular wake-up time can make it easier to maintain a stable routine. Large changes between weekdays and weekends may make Monday mornings harder.
An online calculator cannot measure REM, deep sleep or medical sleep problems. Speak with a healthcare professional if you regularly struggle to sleep or remain very tired.