How much sleep by age?
Sleep needs change across the lifespan and vary from person to person.
Important: Use current public-health or clinical guidance for age-specific recommendations. This page intentionally avoids hard-coding a medical recommendation table that can become stale or be misapplied.
What this calculator can—and cannot—do
The timing calculator can help you plan a sleep window. It cannot determine your personal sleep need, diagnose a sleep disorder, or tell whether you are getting restorative sleep.
Signs to pay attention to
Persistent difficulty sleeping, loud snoring with breathing pauses, or significant daytime sleepiness are reasons to seek professional guidance rather than relying on a timing calculator.