Heart & metabolism
Poor sleep raises blood pressure, insulin resistance, and inflammatory markers.
60-Second Assessment
Your Sleep Age Calculator
Your body has two ages. Find out what your sleep is really doing to yours.
250,000+ usersBacked by sleep scienceNothing is sent to a server
Find your sleep age.
10 quick questions. Your answers stay on your device — nothing is sent to a server.
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What is sleep age?
Your sleep age is a biological score that estimates how old your body effectively is based on the quality, duration, and consistency of your sleep — independent of how old you actually are. While you can't change the year you were born, the way you sleep can move your sleep age years younger or older than your chronological age.
Two 30-year-olds with very different sleep habits can have sleep ages 15+ years apart. The Sleep Age Calculator quantifies that gap so you can see — and shrink — it. For broader context — including the 75+ verified sleep statistics the model is calibrated against — see our 2026 statistics page.
Sleep age vs. biological age
Biological age is a broader measure that includes diet, exercise, genetics, and cellular markers. Sleep age is the slice of biological age driven specifically by your sleep habits. Sleep is the lever you can move fastest — most habit changes show up in sleep age within 2–4 weeks. The full scoring methodology and every cited study are public, and the calculator can be embedded on any site for free.
How is sleep age calculated?
The calculator scores ten evidence-based sleep and lifestyle factors. Each factor adds or subtracts years from your chronological age depending on how it compares to research-backed optimal ranges.
Sleep duration
Total nightly sleep compared to the 7–9 hour adult range.
Sleep quality
How restorative your sleep feels on a 1–10 self-rated scale.
Sleep latency
How long it takes you to fall asleep after lights-out.
Night wakings
Frequency of nighttime arousals that fragment sleep.
Schedule consistency
Whether bedtime and wake time are stable across the week.
Caffeine intake
Daily caffeine load and how late in the day it's consumed.
Screens before bed
Pre-sleep blue-light and stimulating-content exposure.
Exercise frequency
Days per week of moderate-to-vigorous physical activity.
Stress level
Self-rated psychological load that affects sleep onset.
Why sleep age matters
Decades of peer-reviewed research link chronic sleep deficit to faster biological aging. Sleeping less than six hours a night raises the risk of cardiovascular disease, type 2 diabetes, cognitive decline, and weakened immunity. The reverse is also true: people who consistently sleep well live longer, think more clearly, and recover from illness faster.
Brain health
Deep sleep clears beta-amyloid; chronic deprivation accelerates cognitive aging.
Mood & performance
Sleep regulates emotional reactivity, focus, reaction time, and learning consolidation.
Frequently asked questions
Everything you've wondered about the Sleep Age Calculator, sleep scoring, and what your result actually means.
- Sleep age is a biological score that estimates how old your body effectively is based on the quality, duration, and consistency of your sleep — independent of how old you actually are. Two 30-year-olds with very different sleep habits can have sleep ages 15+ years apart.
- The calculator analyzes 10 evidence-based sleep and lifestyle factors — total sleep time, subjective quality, sleep latency, night wakings, schedule consistency, caffeine intake, screen time before bed, exercise frequency, and stress level — and adds or subtracts years from your chronological age based on how each factor compares to research-backed optimal ranges.
- Yes. The Sleep Age Calculator is completely free, requires no sign-up, and stores no personal data. Your inputs are processed in your browser and never sent to a server.
- About 60 seconds. There are 10 quick questions, most of them sliders or single-tap choices.
- It is a wellness estimate, not a clinical diagnosis. The model is based on peer-reviewed sleep research, but every body is different — use the result as a directional signal and a starting point for habit changes, not a substitute for a sleep study or medical advice.
- If your sleep age is significantly higher than your chronological age, or if you experience symptoms like loud snoring, daytime sleepiness, frequent insomnia, or gasping during sleep, talk to a primary-care physician or a sleep specialist about a formal evaluation.
- Every 4 to 12 weeks. Sleep habits take a few weeks to change measurably; testing daily produces noisy results that don't reflect real progress.
- No. Biological age is a broader measure that includes diet, exercise, genetics, inflammation markers, and cellular aging. Sleep age is the slice of biological age driven specifically by your sleep habits — a single, fast-moving lever inside the larger biological-age picture.
- Yes — and faster than most people expect. Sleep age responds to habit changes within 2–4 weeks. The highest-leverage moves are a consistent bedtime/wake time, treating any underlying sleep disorder, and trimming caffeine after 2 PM.
- No mainstream wearable currently outputs a 'sleep age' metric, though many provide sleep score, sleep stages, or readiness scores. You can feed the weekly averages from those devices into the Sleep Age Calculator to get an evidence-based age estimate.
- No. The calculator is a wellness tool that estimates how your sleep habits compare to research-backed optimal ranges. It does not diagnose insomnia, sleep apnea, or any other condition. If your result is high or you have symptoms like loud snoring, daytime sleepiness, or gasping during sleep, see a sleep specialist.
- Each habit that drifts away from research-backed optimal ranges adds a small number of years. Short or fragmented sleep, irregular schedule, late caffeine, screen time before bed, low exercise, and high stress all stack. The result page shows which factors moved your number the most.
- A sleep age equal to or younger than your chronological age is excellent. A gap of up to 2 years is good, 2–5 years is fair, 5–10 is poor, and more than 10 is critical. The category is shown alongside your number on the result screen.
- Above 80 indicates strong overall sleep health. 60–80 is a solid baseline with clear improvements available. Under 60 means several factors are working against you — focus on the high-priority recommendations on your result page first.
- It still gives a useful estimate, but the schedule-consistency factor will count against most rotating-shift workers regardless of habits. Use the result as a directional signal rather than a fixed score, and prioritize the modifiable factors (caffeine timing, screen exposure, exercise).
- The calculator is built for adults (18+). Teens need 8–10 hours of sleep, not 7–9, and their circadian biology is shifted later — the model's optimal ranges don't fully apply.