All sleep tools
Ten free calculators, each built around a different question about sleep.
Sleep calculatorBedtimes and wake-up times that fall between sleep cycles.
Bedtime calculatorWork back from your alarm to the right time to sleep.
Wake-up time calculatorGoing to bed at a set time? Find the best alarm.
Nap calculatorPower nap or full cycle, with the exact alarm time.
Sleep need by ageHours of sleep from newborns to grandparents.
Sleep debt calculatorAdd up last week's lost sleep and plan the payback.
Night shift sleep plannerA sleep schedule for BPO, IT, hospital and factory shifts.
Baby sleep scheduleWake windows and nap timing for 0 to 3 year olds.
Brahma Muhurta calculatorToday's Brahma Muhurta for your city, with a bedtime to match.
Chai and coffee cut-offWhen to have your last cup so it doesn't steal your sleep.
Pre-calculated times
Looking for one specific time? These pages show the answers worked out in advance.
What time should I sleep if I wake up at…
What time should I wake up if I sleep at…