Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Caffeine Sleep Impact Calculator

Estimate how much caffeine remains active in your body at bedtime based on when you last consumed it and your personal sensitivity. Use it to decide your caffeine cutoff time so it doesn't wreck your sleep.

Caffeine Consumed (mg)

Time of Consumption (24h (e.g. 14.5))

Planned Bedtime (24h (e.g. 23))

Caffeine Sensitivity

Fill in the required fields to see your result.

Sleep

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.

Bedtime Consistency

Screen Time Before Bed

Last Caffeine Intake

Sleep Environment

Sleep Hygiene Score

75 %

Poor hygieneFair hygieneGood hygieneExcellent hygiene

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 Sleep Impact Calculator	Sleep Hygiene Score Calculator
Category	Sleep	Sleep
Inputs required	4	4
Result	Caffeine in System at Bedtime (mg)	Sleep Hygiene Score (%)
What it does	Estimate how much caffeine remains active in your body at bedtime based on when you last consumed it and your personal sensitivity. Use it to decide your caffeine cutoff time so it doesn't wreck your sleep.	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.