sleep Calculators
Last updated: May 2026
Sleep Cycle Calculator
Find your ideal bedtime by working backward from your wake-up time in complete 90-minute sleep cycles.
Sleep Debt Calculator
Quantify how many hours of sleep you owe your body by comparing your ideal sleep need against actual sleep over a period of days.
Sleep Efficiency Calculator
Measure what percentage of your time in bed is actually spent sleeping — a key clinical marker of sleep quality used in insomnia diagnosis and treatment.
REM Sleep Calculator
Estimate how much of your nightly sleep is spent in REM based on total sleep time and age.
Caffeine Sleep Impact Calculator
Calculate how many milligrams of caffeine remain active in your system at bedtime based on when and how much you consumed, using a standard 5-hour half-life.
Sleep Quality Score Calculator
Score your nightly sleep quality using duration, efficiency, and wake-ups.
Optimal Nap Timing Calculator
Find your ideal nap window based on when you wake up and when you go to bed.
Sleep Need by Age Calculator
Find how many hours of sleep you should be getting based on your age and activity level.
Shift Work Sleep Calculator
Calculate when you should go to sleep to get 8 hours of rest before your shift, accounting for commute time.
Jet Lag Recovery Calculator
Estimate how many days you'll need to recover from jet lag based on time zones crossed, travel direction, and age.
Sleep Debt Calculator
Quantify how many hours of sleep you owe your body after days of short nights.
REM Sleep Cycle Calculator
Find the ideal bedtime to wake up refreshed by aligning your alarm with the end of a complete 90-minute sleep cycle.
Caffeine Sleep Impact Calculator
Estimate how much caffeine remains active in your body at bedtime based on when you last consumed it and your personal sensitivity.
Shift Work Sleep Calculator
Plan your sleep window around rotating or night shifts by accounting for shift times, commute, and adjustment buffers.
Sleep Efficiency Calculator
Calculate your sleep efficiency percentage — the ratio of actual sleep to time spent in bed — adjusted for night wakings and how long it takes you to fall asleep.
Jet Lag Recovery Calculator
Estimates how many days you'll need to recover from jet lag based on time zones crossed, travel direction, age, and pre-travel preparation.
Strategic Nap Timing Calculator
Calculates the ideal nap duration in minutes based on your sleep goal and how much sleep debt you're carrying.
Sleep Temperature Optimizer
Recommends an ideal bedroom temperature in °F for better sleep quality based on season, sleepwear, and bedding weight.
Sleep Hygiene Score Calculator
Scores your overall sleep hygiene on a 0–100 scale by rating bedtime consistency, pre-bed screen time, last caffeine intake, and sleep environment.
Power Nap Productivity Calculator
Estimates your post-nap productivity level (0–95 scale) based on current alertness, nap duration, and the time of day you plan to nap.
Sleep Cycle Optimizer
Find your ideal bedtime or wake time by aligning sleep with natural 90-minute cycles.
Caffeine Metabolism Calculator
Calculate exactly when caffeine will drop below a safe threshold in your bloodstream so it stops disrupting your sleep.
Jet Lag Recovery Calculator
Estimate how many days it will take to recover from jet lag based on time zones crossed, travel direction, age, and your chronotype.
Personal Sleep Need Calculator
Calculate your personalized nightly sleep requirement based on age, activity level, stress, and health status.
Sleep Quality Score Calculator
Score your sleep quality out of 100 by rating duration, consistency, morning alertness, disturbances, and environment.
Sleep Cycle Calculator
Find the ideal bedtime or wake-up time by aligning with 90-minute sleep cycles.
REM Sleep Calculator
Estimate how much REM (dream) sleep you get each night based on your age, total sleep, quality, and alcohol intake.
Melatonin Timing Calculator
Determine the best time to take melatonin to shift your body clock to a new bedtime.
Nap Optimization Calculator
Calculate the ideal nap length and timing to boost alertness or memory without causing sleep inertia or disrupting nighttime sleep.
Age-Based Sleep Requirement Calculator
Calculate your personalized nightly sleep target based on age, physical activity, stress, and health status.
Melatonin Timing Calculator
Find your ideal melatonin dose and when to take it based on your weight, age, and sleep issue.
Caffeine Half-Life Sleep Impact Calculator
See exactly how much caffeine remains in your bloodstream at any point after consumption.
Optimal Bedtime Calculator
Work out exactly what time to go to bed so you wake up feeling rested and aligned with full sleep cycles.
Chronotype Sleep Schedule Calculator
Discover your biologically ideal bedtime and wake time based on your chronotype, energy patterns, work schedule, and light exposure.
Weekly Sleep Debt Calculator
Compares the sleep you need each night with the sleep you actually get and totals the shortfall across a week.