// SLEEP-CALCULATOR-HUB.v3
Backwards from
your wake time.
18 free calculators for bedtime, wake time, sleep debt, chronotype, and more. Built on sleep science, not guesswork. No account, no paywall.
· based on sleep cycle science· shareable results· mobile-friendly· no account needed
§01 · ALL CALCULATORS
18 / 18- .01Sleep Cycle Calculatortiming
- .02Bedtime Calculatortiming
- .03Wake Up Time Calculatortiming
- .04Nap Duration Calculatortiming
- .05Caffeine Cutoff Calculatortiming
- .06Sleep Debt Calculatorhealth
- .07How Much Sleep Do I Needhealth
- .08Sleep Deprivation Costhealth
- .09Sleep Quality Scorehealth
- .10Baby Sleep Calculatorlife
- .11Shift Work Sleep Calculatorlife
- .12Jet Lag Recovery Calculatorlife
- .13Chronotype Calculatorcirc.
- .14Sleep Schedule Fixercirc.
- .15Melatonin Timing Calculatorcirc.
- .16Alcohol & Sleep Calculatorcirc.
- .17Teen Sleep Calculatorcirc.
- .18Sleep Banking Calculatorcirc.
§02 · SLEEP SCIENCE
all articles →◆ sleep science
Sleep Cycles Explained
What happens in each 90-minute cycle, and why waking mid-cycle feels terrible.
◆ circadianWhat Is a Chronotype?
Lion, Bear, Wolf, Dolphin, and the biology that determines which one you are.
◆ sleep scienceCaffeine and Sleep
Caffeine's 5 to 7 hour half-life means your 2pm coffee is still 50% active at 9pm.
§03 · NEW TOOLS
Get notified when new sleep tools launch.
We are adding new calculators and articles. No spam, just a note when something new ships.
◆ method
Every calculator is built on peer-reviewed research and named consensus guidelines. See the methodology for the full source list.