Wellness Tools
Science-backed calculators connecting sleep, hydration, caffeine, fitness, and body metrics—free, private, and designed alongside our 90-minute sleep cycle planner.
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Plan bedtimes and wake times aligned to 90-minute sleep cycles.
Track caffeine cutoff times, sleep debt, and workout windows for deeper rest.
BMI screening and daily water targets linked to energy and sleep quality.
Quick utilities that complement your wellness routine.
Get recommendations tailored to your unique health profile and lifestyle.
Make informed decisions about sleep, fitness, and wellness.
All calculators are based on research-backed formulas and guidelines.
Simple, intuitive interfaces that work on any device.
Each free tool connects a daily habit—caffeine, exercise, hydration, or body weight—to sleep quality. Use them alongside our 90-minute sleep cycle calculator to build a complete bedtime routine.
Caffeine has a half-life of about 5–6 hours, so afternoon coffee can still block adenosine at bedtime. Our caffeine cutoff calculator estimates remaining mg in your system. Pair it with the workout timing tool—vigorous exercise within 3 hours of bed can delay sleep onset, while morning cardio can deepen slow-wave sleep.
Sleep debt accumulates when you consistently sleep less than your body needs. Tracking nightly hours against your target reveals whether you need a recovery weekend or a consistent earlier bedtime. Completing full 90-minute cycles—rather than chasing raw hours—helps clear debt without grogginess.
Dehydration disrupts sleep architecture and raises nighttime awakenings. The water intake calculator estimates daily liters from weight and activity. BMI screening highlights weight ranges linked to sleep apnea risk—excess weight is one of the strongest predictors of fragmented sleep.