Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Personal Sleep Need Calculator
Calculate your personalized nightly sleep requirement based on age, activity level, stress, and health status. Use it to set a realistic, science-backed sleep goal rather than guessing.
Sleep Need
8 hours
8-9 hours sits in the middle-to-upper part of NSF's 7-9 hour adult range; in this formula it means roughly 0.5-1.5 hours of combined activity, stress, or health load on top of a 7.5-8 hour base.
Thresholds follow National Sleep Foundation (NSF) guidance — 7-9 hours for adults, 8-10 for teens — with this formula adding up to 2 hours for activity, stress, and health load.
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. Use it to identify which habits are undermining your sleep.
Sleep Hygiene Score
75 %
75-90%, like the example's 75%, means most habits are solid with one or two to refine. Raising one remaining 2 or 3 to a 4 lifts you past 90%.
Score averages four habit ratings (each 1-4) scaled to 100, so each habit is worth 25 points; bands mark how many habits are at or near best practice.
Key differences
| Personal Sleep Need Calculator | Sleep Hygiene Score Calculator | |
|---|---|---|
| Category | Sleep | Sleep |
| Inputs required | 4 | 4 |
| Result | Sleep Need (hours) | Sleep Hygiene Score (%) |
| What it does | Calculate your personalized nightly sleep requirement based on age, activity level, stress, and health status. Use it to set a realistic, science-backed sleep goal rather than guessing. | Scores your overall sleep hygiene on a 0–100 scale by rating bedtime consistency, pre-bed screen time, last caffeine intake, and sleep environment. Use it to identify which habits are undermining your sleep. |