Sleep Calculator By Age And Gender

1. Choose the age group. Ranges run from newborns to adults over 65.
2. Add your usual sleep (optional). The calculator shows how it compares with the recommended range. For children under 6, include naps.
3. Add a wake-up time (optional). You get a bedtime window that fits the recommended hours.

Each bar shows the recommended hours of sleep per day for one age group. The calculator highlights the group you choose and marks your own hours on it: green inside the range, red outside it.

A sleep calculator by age shows how many hours of sleep a person of a given age needs, based on expert guidelines. Sleep need is highest in newborns and falls steadily through childhood, settling at 7 to 9 hours for most adults.

Gender does not change the recommendation. The National Sleep Foundation and MedlinePlus set ranges by age only, so a woman and a man of the same age have the same target. Sex can still affect sleep in other ways, for example through pregnancy or menopause, which is covered in our menopause sleep tool.

The calculator looks up the recommended range for your age group, then compares it with your own sleep and builds a bedtime window.

1. Find the range for the age group (adult: 7 to 9 hours).
2. Weekly target: 7 x 7 = 49 hours to 9 x 7 = 63 hours.
3. Compare your hours: 6.5 hours is 30 minutes below the range.
4. Bedtime window for a 6:30 AM wake-up: 9:30 PM (9 hours) to 11:30 PM (7 hours).

These are hours of sleep, not time in bed. Leave extra time to fall asleep; the bedtime calculator adds that and aligns your bedtime with sleep cycles.

Take a 34-year-old who usually sleeps about 6.5 hours and wakes at 6:30 AM. The calculator shows a range of 7 to 9 hours, 49 to 63 hours a week.

Thirty minutes below the range is close to the flexible zone the National Sleep Foundation describes, but if they feel tired in the day, moving bedtime 30 to 60 minutes earlier is the simplest fix.

Age

The biggest factor. Newborns need 14 to 17 hours a day; adults over 65 need 7 to 8.

Individual Differences

Some people do well at the low end of the range, others need the top of it. The National Sleep Foundation notes that an extra hour or two either side can be appropriate for some people.

Illness, Pregnancy And Recovery

Being unwell or pregnant can raise the need for rest. Talk to a doctor about big changes.

Sleep Quality

Broken sleep can leave you tired even within the range. The sleep duration calculator separates time asleep from time in bed.

No official guideline gives different hours for men and women. What differs between sources is how they group children.

Bedtime windows that give the recommended hours of sleep for each wake-up time. These are sleep times, so lights out should be 15 to 30 minutes earlier.

For a 13-year-old, the National Sleep Foundation range is 9 to 11 hours; MedlinePlus, which groups ages 13 to 18 together, gives 8 to 10.

• Parents checking whether a baby, toddler or teenager is getting enough sleep.
• Adults wondering whether their usual sleep is enough.
• Older adults whose sleep pattern is changing.

Using Time In Bed

The ranges are for sleep, not time in bed.

Forgetting Naps For Young Children

For children under 6, naps count toward the daily total.

Assuming Older Adults Need Much Less

Adults over 65 still need 7 to 8 hours; sleep often becomes lighter, not less necessary.

Expecting A Different Target By Sex

Guidelines are the same for women and men of the same age.

The ranges come from expert guidelines and fit most healthy people, but individual needs vary.

Adults 18 to 64 need 7 to 9 hours, adults over 65 need 7 to 8, teens 8 to 10, and school-age children 9 to 11, according to the National Sleep Foundation.

Official guidelines give the same range for women and men of the same age. Pregnancy and menopause can disturb sleep, but the target is the same.

Newborns aged 0 to 3 months need 14 to 17 hours a day, including daytime naps.

Teens aged 14 to 17 need 8 to 10 hours a night, and many regularly get less.

That is 8 hours in bed. The National Sleep Foundation recommends 9 to 11 hours at 13, so a bedtime nearer 9:30 PM fits a 6:30 AM wake-up better.

For a 7:00 AM wake-up, 9 to 11 hours of sleep means falling asleep between 8:00 and 10:00 PM. Aim for the earlier half to allow time to fall asleep.

Slightly less: 7 to 8 hours for adults over 65, compared with 7 to 9 for younger adults.

Six hours is below the 7-hour minimum for adults. Some people may cope at the low end, but regular short sleep is linked to health risks.

For babies and young children, yes: their ranges include naps. For adults, the ranges refer mainly to night sleep.

No major guideline adjusts sleep hours for activity level, so the calculator uses age alone.

There is no separate official figure. A 2021 expert consensus in the British Journal of Sports Medicine says a one-size-fits-all 7 to 9 hours is unlikely to be ideal for athletes and recommends an individual target based on the athlete’s own sense of how much sleep they need. It also notes that elite athletes often sleep less than 7 hours.

• National Sleep Foundation: How much sleep do you really need? (age-group ranges; flexible hour)
• MedlinePlus: Healthy sleep (ranges by age, including naps)
• NHLBI: How much sleep is enough (sleep need by age)
• Walsh et al. Sleep and the athlete: 2021 expert consensus recommendations (Br J Sports Med) (individual sleep targets for athletes)