Sleep Calculator
Find optimal bedtime and wake-up times
Formula
Bedtime = Wake Time - (Cycles × 90min) - 15min
Sleep cycles are ~90 minutes. Waking between cycles reduces grogginess. 15 min to fall asleep.
Examples
Wake at 7:00 AM
Best bedtimes: 11:15 PM (5 cycles) or 9:45 PM (6 cycles).
Frequently Asked Questions
About Sleep
Calculate optimal bedtimes based on sleep cycle science.
Related Calculators
BMI Calculator
Calculate your Body Mass Index and health category
Use calculator
Calorie Calculator
Find your daily calorie needs based on goals
Use calculator
Body Fat Calculator
Estimate your body fat percentage
Use calculator
Ideal Weight Calculator
Find your ideal weight based on height and frame
Use calculator