Sleep Calculators
Last updated: September 2026
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.
Sleep Cycle Calculator
Find your ideal bedtime by working backward from your wake-up time in complete 90-minute sleep cycles.
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.
REM Sleep Calculator
Estimate how much of your nightly sleep is spent in REM based on total sleep time and age.
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.
Shift Work Sleep Calculator
Plan your sleep window around rotating or night shifts by accounting for shift times, commute, and adjustment buffers.
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.
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 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.
Strategic Nap Timing Calculator
Calculates the ideal nap duration in minutes based on your sleep goal and how much sleep debt you're carrying.
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 Temperature Optimizer
Recommends an ideal bedroom temperature in °F for better sleep quality based on season, sleepwear, and bedding weight.
Chronotype Sleep Schedule Calculator
Discover your biologically ideal bedtime and wake time based on your chronotype, energy patterns, work schedule, and light exposure.
Personal Sleep Need Calculator
Calculate your personalized nightly sleep requirement based on age, activity level, stress, and health status.
Caffeine Metabolism Calculator
Calculate exactly when caffeine will drop below a safe threshold in your bloodstream so it stops disrupting your sleep.
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.
Weekly Sleep Debt Calculator
Compares the sleep you need each night with the sleep you actually get and totals the shortfall across a week.
Melatonin Timing Calculator
Determine the best time to take melatonin to shift your body clock to a new bedtime.
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 what time to go to bed so you wake up aligned with a full 90-minute sleep cycle, factoring in the average 15 minutes it takes to fall asleep.
Sleep Quality Score Calculator
Score your sleep quality out of 100 by rating duration, consistency, morning alertness, disturbances, and environment.
Jet Lag Recovery Calculator
Estimate the number of days needed to fully resync your circadian rhythm after long-haul travel, weighted by time-zone shift, direction (eastward is harder), age, and travel frequency.