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Are you getting enough sleep? The honest answer is rarely a single magic number — it is a range that shifts with age. This free sleep calculator tells you the typical nightly sleep range for your age group and works out a suggested bedtime from the time you normally wake, so the recommendation fits your real schedule. It also covers why waking refreshed is a better signal than the clock, and what to do when you sleep plenty but still feel drained. Educational guidance, not medical advice.
Find the typical sleep range for your age and a suggested bedtime that gets you there — wake refreshed, not by the clock.
A small minority genuinely thrive on short sleep, but most people who claim it are running on fatigue. If you need an alarm to wake and caffeine to function, you are probably in the 7-9 hour camp.
Quantity is only half the story — consistency, timing and sleep quality matter. If you regularly sleep long and still wake wrecked, mention it to a doctor; sleep apnoea and other conditions are common and treatable.
Big weekend shifts confuse your body clock and make Monday mornings brutal. Keeping your wake time roughly stable all week is one of the most effective sleep habits there is.
Every tool answers instantly from our own knowledge and calculators — educational only, never a diagnosis. Want the deeper, personalised version? Each has a $2.95 full report.