All sleep tools

Every calculator runs entirely in your browser. No signup, no upload, no ads. Each one targets one specific question and answers it in under a second.

Bedtime calculator

Enter the time you need to wake up. Get bedtimes that land at the end of a complete 90-minute sleep cycle so you wake easy, not groggy.

Answers: what time should i go to bed to wake up at 6amOpen

Wake-up time calculator

Going to bed soon? Set your bedtime and see wake times that catch you in light sleep, avoiding the dull "sleep inertia" of waking mid-deep-sleep.

Answers: what time should i wake up if i go to bed at 11pmOpen

Nap calculator

Three useful nap lengths: 20-minute power nap, 60-minute recovery, 90-minute full cycle. Pick one — see exactly when to set the alarm.

Answers: how long should i napOpen

Caffeine cutoff calculator

Set your dose and bedtime. Uses caffeine’s 5-hour half-life to show how much is in your system at bedtime and your latest safe intake.

Answers: how late can i drink coffeeOpen

Jet lag calculator

Departure and arrival cities in, days-to-recover out — plus light-exposure strategy and a three-day pre-trip schedule shift.

Answers: jet lag recovery calculatorOpen

Chronotype quiz

Five questions, based on the validated rMEQ. Find out if you’re a morning, intermediate, or evening type — and your ideal sleep schedule.

Answers: am i a morning person quizOpen

Sleep debt calculator

Enter the last 7 nights. See accumulated debt, severity, and a realistic recovery plan. No, you can’t fix it by sleeping in Saturday.

Answers: sleep debt calculatorOpen

Sleep need by age

How much sleep does a newborn, teen, or 60-year-old need? Pick an age, see the National Sleep Foundation consensus range plus a midpoint target.

Answers: how much sleep do i need by ageOpen

Melatonin timing

When to take 0.3–0.5 mg melatonin — either as a sleep onset aid tonight, or as part of a phase-advance protocol to shift your schedule earlier.

Answers: when to take melatoninOpen

Sleep efficiency

Are you using your time in bed effectively? Time in bed minus latency and wake time, expressed as a percentage. 85% is the clinical normal cutoff.

Answers: sleep efficiency calculatorOpen

More tools may come later. The next candidates: sleep cycle visualizer (interactive timeline), shift work planner, DST adjustment helper, polyphasic schedule planner.