Free Sleep Calculators & Planners
Our sleep calculators and planners are simple, free tools designed to make everyday sleep decisions easier. From finding the best bedtime to planning naps, cutting off caffeine, or choosing bedding, each tool gives you clear, practical guidance without gimmicks. There’s nothing to download, no sign-ups, and no tracking – just quick answers you can use right away.
Browse the tools below to explore calculators for sleep cycles, naps, caffeine cutoff times, pillow loft, duvet warmth, and polyphasic sleep schedules. All tools are for general information only and not a substitute for professional advice.
Sleep Cycle Bedtime Calculator
Enter your wake time (or bedtime) to get 4–6 optimal bed/wake options using 90-minute cycles plus sleep-onset.
OpenNap Planner & Timer
Plan power naps (15–25m) or one full cycle (90m) with one-click timers and smart warnings near bedtime.
OpenCaffeine Cutoff Calculator
Pick your bedtime and sensitivity to get the latest advisable time for coffee/tea based on half-life.
OpenPillow Loft Finder
Recommended pillow height by sleep position, shoulder width, and mattress firmness — in cm and inches.
OpenDuvet TOG & Room Temp Guide
Map bedroom temperature and preference to the right TOG and fabrics, with seasonal layering tips.
OpenPolyphasic Sleep Calculator
Explore monophasic, biphasic, Everyman, Uberman, and Dymaxion schedules. Build a 24h timetable with naps and core sleep.
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