Sleep Need Calculator
Find out how much sleep you need based on age.
Get NSF-recommended sleep hour ranges from infants through older adults with tips for better sleep quality.
Sleep need by age and activity level combines official guidelines with individual adjustment factors to estimate your optimal nightly sleep target.
Base sleep recommendations (National Sleep Foundation):
| Age Group | Recommended Hours | Acceptable Range |
|---|---|---|
| Newborns (0–3 mo) | 14–17 hours | 11–19 hours |
| Infants (4–11 mo) | 12–15 hours | 10–18 hours |
| Toddlers (1–2 yrs) | 11–14 hours | 9–16 hours |
| Preschoolers (3–5) | 10–13 hours | 8–14 hours |
| School-age (6–13) | 9–11 hours | 7–12 hours |
| Teenagers (14–17) | 8–10 hours | 7–11 hours |
| Young adults (18–25) | 7–9 hours | 6–11 hours |
| Adults (26–64) | 7–9 hours | 6–10 hours |
| Older adults (65+) | 7–8 hours | 5–9 hours |
Activity-level adjustment:
- Sedentary (desk job, minimal exercise): Base recommendation
- Moderately active (3–4 workouts/week): Add 30–45 minutes
- Highly active (6–7 intense sessions/week): Add 45–90 minutes
- Elite athlete in training: Up to 10 hours recommended
Formula: Adjusted Sleep Need = Base Hours + (Activity Multiplier × 0.5–1.5 hours)
Worked example: A 34-year-old adult who exercises intensely 5 days per week: Base = 8 hours (mid-range for adults) Activity adjustment = +45 minutes Adjusted target = 8 hours 45 minutes
Sleep debt: Each hour of missed sleep accumulates as “sleep debt.” Research from the University of Pennsylvania shows that sleeping 6 hours per night for two weeks causes the same cognitive impairment as two full nights of complete sleep deprivation — but subjects don’t feel as impaired as they actually are. Recovery from chronic sleep debt requires multiple full-sleep nights, not just one.