Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Caffeine Metabolism Calculator
Calculate exactly when caffeine will drop below a safe threshold in your bloodstream so it stops disrupting your sleep. Ideal for coffee drinkers planning their last cup of the day.
Sleep Hygiene Score Calculator
Scores your overall sleep hygiene on a 0β100 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
| Caffeine Metabolism Calculator | Sleep Hygiene Score Calculator | |
|---|---|---|
| Category | Sleep | Sleep |
| Inputs required | 3 | 4 |
| Result | Hours to Clear (hours) | Sleep Hygiene Score (%) |
| What it does | Calculate exactly when caffeine will drop below a safe threshold in your bloodstream so it stops disrupting your sleep. Ideal for coffee drinkers planning their last cup of the day. | Scores your overall sleep hygiene on a 0β100 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. |