Sleep Quality Score Calculator
Score your nightly sleep quality using duration, efficiency, and wake-ups. Use it after any night to spot patterns and improve your rest over time.
About this calculator
This calculator combines three key pillars of sleep quality into a single 0–100 score. First, it scores your sleep duration: if you slept 7 or more hours you get the full 100 points; otherwise your hours are multiplied by 14.3 to scale proportionally. Sleep efficiency (the percentage of time in bed actually spent asleep) is added directly as a percentage points contribution. Night wakings are penalized at 10 points each, reflecting how fragmented sleep disrupts restorative cycles. The three components are then averaged: Score = ((duration ≥ 7 ? 100 : duration × 14.3) + efficiency − (wakings × 10)) / 3. A score above 80 is generally considered good sleep; below 60 suggests significant room for improvement.
How to use
Suppose you slept 6.5 hours, had a sleep efficiency of 85%, and woke up 2 times during the night. Step 1 — Duration score: 6.5 × 14.3 = 92.95. Step 2 — Efficiency score: 85. Step 3 — Waking penalty: 2 × 10 = 20. Step 4 — Combine: (92.95 + 85 − 20) / 3 = 157.95 / 3 = 52.65. Your sleep quality score is approximately 53 out of 100, indicating fragmented or insufficient sleep that could benefit from earlier bedtime and fewer disruptions.
Frequently asked questions
What is a good sleep quality score and how is it measured?
A score above 80 is generally considered good sleep quality, while 60–80 is fair and below 60 suggests poor sleep. The score blends duration (how many hours you slept), efficiency (how much of your time in bed was actual sleep), and fragmentation (how many times you woke up). Tracking your score nightly helps reveal whether lifestyle changes like earlier bedtimes or reducing blue light exposure are working. No single metric tells the whole story, which is why combining all three gives a more accurate picture.
How does sleep efficiency affect my overall sleep quality score?
Sleep efficiency is the percentage of time spent in bed that you actually spend asleep, and it contributes directly to your score on a point-for-point basis. An efficiency of 90% adds 90 points to the numerator before averaging, whereas 60% adds only 60. Poor efficiency often results from lying in bed awake for long periods, which can be improved through stimulus control techniques like only going to bed when sleepy. Wearables and sleep trackers can estimate this metric automatically if you prefer not to log it manually.
Why do night wakings lower the sleep quality score so significantly?
Each waking deducts 10 points from the score because fragmented sleep prevents you from completing full 90-minute sleep cycles, which are essential for deep (slow-wave) and REM sleep. Even if total duration looks acceptable, two or three wakings can cut your score by 20–30 points. Causes of night wakings include sleep apnea, stress, noise, or a full bladder. Addressing the root cause — rather than just extending time in bed — tends to produce the biggest improvements in score.