Sleep Need by Age Calculator
Find how much sleep you actually need based on your age, activity level, and current sleep-debt symptoms, with a recommended bedtime worked back from the wake time you want to hold.
General wellness guidance, not medical advice. See a doctor for chronic insomnia, suspected sleep apnea, or persistent symptoms. For the habits behind the numbers, read How to Sleep Better Tonight.
Calculate your sleep need and bedtime
Enter your age and the wake time you want to keep, then pick your activity level and how you have been sleeping lately. Results update live.
8 hours per night
For a 35-year-old at moderate activity, aim for an 11:00 PM bedtime to wake at 7:00 AM.
How to use this calculator
Enter your age and the wake time you want to keep seven days a week. Pick your activity level (active people need a little more recovery sleep) and how you have been sleeping lately. The calculator returns your recommended hours, a bedtime worked back from your wake time, and an estimate of your current sleep debt. It is general wellness guidance, not medical advice.
Recommended sleep by age
These ranges come from CDC, Health Canada, National Sleep Foundation, and American Academy of Pediatrics guidance. This calculator is designed for ages 5 and up; for younger children, consult your pediatrician, since sleep needs change rapidly in early childhood.
| Age group | Recommended sleep |
|---|---|
| Newborn (0 to 3 months) | 14 to 17 hours |
| Infant (4 to 11 months) | 12 to 16 hours |
| Toddler (1 to 2 years) | 11 to 14 hours |
| Preschool (3 to 5 years) | 10 to 13 hours |
| School age (6 to 13 years) | 9 to 11 hours |
| Teen (14 to 17 years) | 8 to 10 hours |
| Young adult (18 to 25 years) | 7 to 9 hours |
| Adult (26 to 64 years) | 7 to 9 hours |
| Older adult (65+ years) | 7 to 8 hours |
Tips for success
- Anchor on wake time, not bedtime. Pick a wake time you can hold all seven days, weekends included. Weekend variability, or social jet lag, is the single biggest sleep-schedule killer. Adjust your bedtime to that fixed wake time.
- Sleep debt does not repay in a weekend. A 10-hour debt from a tough week needs one to two weeks of consistent extra sleep, not a single sleep-in Saturday.
- CBT-I is the gold standard for chronic insomnia. Cognitive Behavioral Therapy for Insomnia outperforms sleeping pills long-term with no side effects. Free and paid apps include CBT-i Coach (free, built by the US VA), Sleepio, and Somryst (FDA-approved).
- Snoring plus daytime sleepiness means screen for sleep apnea. Ask your doctor for a sleep study. Treatment, usually CPAP, typically restores normal sleep within weeks.
- Active people need a little more. Athletes and people doing heavy physical work recover during deep sleep, so add roughly 15 to 30 minutes to the baseline for your age.
Canada: getting a sleep study
If the tool flags severe sleep debt or you suspect apnea, here is how the Canadian system handles it.
- Provincial coverage exists. OHIP (Ontario), RAMQ (Quebec), MSP (BC), AHS (Alberta), and the other provincial plans cover an overnight sleep study (polysomnography) at accredited labs when your family physician refers you for suspected apnea or another documented sleep disorder.
- Public wait times are long. Expect 3 to 12 months for a public sleep lab in most provinces.
- Private clinics are faster. Private sleep clinics schedule in 1 to 2 weeks at roughly $400 to $1,500 CAD out of pocket for a full study.
- CPAP help. Programs like Ontario's ADP and provincial equivalents cover part of a CPAP machine, and extended health insurance often fills the gap.
FAQ
How much sleep do I actually need?
Most adults aged 18 to 64 need 7 to 9 hours a night, with a working midpoint of 8. Teens need 8 to 10, school-age children 9 to 11, and adults 65 and over 7 to 8. Active people need a little more. Fewer than 1% of people are genetic short-sleepers; almost everyone who says they only need 5 hours is sleep-deprived.
Should I set my bedtime or my wake time first?
Set your wake time first and hold it seven days a week. Weekend variability, or social jet lag, is the single biggest sleep-schedule killer. Once your wake time is fixed, subtract your recommended hours to get a bedtime, which is exactly what this calculator does.
Can I repay sleep debt by sleeping in on the weekend?
Not really. A 10-hour debt from a hard week needs one to two weeks of consistent extra sleep, not a single sleep-in Saturday. Weekend catch-up also shifts your rhythm later and causes Sunday-night insomnia.
When should I see a doctor about my sleep?
See a doctor if you snore and feel sleepy during the day, if insomnia lasts three or more months, if you fall asleep during conversations or while driving, or if you act out dreams. Sleep apnea treatment and CBT-I both work well once diagnosed.
Is melatonin or a sleeping pill the answer to insomnia?
For chronic insomnia, no. Melatonin works for jet lag and shift-work transitions but not ongoing insomnia, since your body already makes it. CBT-I is the gold standard and beats medication long-term with no side effects.
Bottom line
Most adults need 7 to 9 hours, teens and children need more, and active people need a little extra recovery sleep. Fix your wake time, set bedtime to match, and treat sleep debt as something that repays over weeks, not weekends. For the habits behind the numbers see How to Sleep Better Tonight, and track your pattern with the Sleep Quality Log. This tool is general guidance, not a diagnosis.