Free calculators for sleep, mental wellbeing, recovery, fitness, nutrition and everyday health.
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Find bedtimes to wake up feeling alert between 90-minute sleep cycles.
Open ➔Find exact times to go to bed based on your wake-up time and cycles.
Open ➔Find the best wake-up times based on your bedtime and complete cycles.
Open ➔Determine how much sleep you missed over the past week and recover.
Open ➔Find out how much caffeine remains in your body from morning coffee.
Open ➔Calculate recommended hours based on age, lifestyle, and activity level.
Open ➔Find ideal target sleep duration based on age and lifestyle factors.
Open ➔Calculate optimal sleep opportunity window for maximum rest.
Open ➔Pick where you are today.
70+ calculator tools across Sleep, Mind, Body, Family and Lifestyle.
Bedtimes, wake-up alarms & cycles
Debt, efficiency, consistency
Jet lag, shifts, chronotypes
Nap duration and relaxation
Mood, stress and recovery
Burnout recovery & stress
Your choices and inputs stay privately in your browser where possible. No personal health accounts or complex passwords required to use our tools.
Every calculator shows how results are computed.
Guided by scientific literature on sleep architecture.
Tested for usability and clear, honest information.
We tell you when a tool is not suitable for your needs.
Educational tools, not a substitute for medical advice.
Formulas are maintained with current sleep guidelines.