About All Sleep Calculators

All Sleep Calculators is a free set of sleep planning tools. You enter a wake-up time and get sensible bedtime options, or enter a bedtime and see good times to wake up. There are also calculators for sleep cycles, sleep duration, sleep debt, naps, shift work sleep windows, and jet lag schedule planning, plus short guides that explain the ideas behind the numbers.

Everything is free and there is no account to create. Your inputs stay in your browser; nothing is sent to our servers. We explain exactly how each calculation works on the methodology page, including every assumption and simplification.

All Sleep Calculators is a planning aid, not a medical device. We do not diagnose sleep disorders, we do not track your actual sleep, and we do not promise that any suggested time will make you wake up refreshed. Sleep cycles vary from person to person and across the night, so every suggestion here is an estimate built on clearly documented averages.

If you snore heavily, gasp during sleep, struggle with insomnia most nights, or feel exhausted despite getting enough hours, please talk to a qualified health professional. No calculator can replace that conversation.

All Sleep Calculators is supported by advertising. Ad placements appear only when advertising is configured; otherwise the pages render without them. We do not sell data, because we do not collect any. Details are in the privacy policy.

Questions, corrections, or feedback? Write to us at hello@allsleepcalculators.com. More on the contact page.