A broader sleep context
How much sleep might you need?
Choose an age range to see a published sleep-duration range. Use it as a starting point, separate from the cycle-based timing calculators.
Try the calculator
These are broad recommendations for regular sleep, not a diagnosis or a personal prescription.
Duration is not the same as timing
This calculator shows broad recommendations for how much sleep people in an age group generally need. It does not calculate a bedtime, detect sleep stages, or account for every personal factor.
Use the range as context
Regularity, sleep quality, daytime alertness, health, and individual variation all matter. The range is not a promise that one number will fit every person, and it is not medical advice.
Want to plan a time?
Use the bedtime calculator to work backward from a wake time, or the sleep cycle calculator to compare times around a simple 90-minute planning interval.
Sources
Ranges are based on the CDC's age-based sleep guidance, which references consensus recommendations from sleep and public-health organizations. Reviewed August 17, 2026.