Baby sleep schedule calculator
Use age, morning wake time and actual naps to see a transparent bedtime planning window.
Direct answer: infants aged 4–11 months generally need 12–16 total hours of sleep in 24 hours, including naps. This calculator subtracts the naps you enter and shows the bedtime range that would leave the remaining nighttime sleep before wake-up.
Enter actual nap time—not an assumed nap count. The bedtime window is simple sleep-budget math and does not predict when your child will fall asleep.
With 3.0 hours of naps, this leaves roughly 9.0–13.0 hours for nighttime sleep.
The evidence-based part: total sleep in 24 hours
The American Academy of Sleep Medicine sleep advisory recommends 12–16 hours for ages 4–12 months, 11–14 hours for ages 1–2 years and 10–13 hours for ages 3–5 years. Each range includes naps.
Those are total-duration ranges, not fixed clock schedules. Temperament, development, illness, childcare and family rhythms can all affect how sleep is distributed. The tool therefore asks for real nap hours instead of inventing a universal nap count.
Safe sleep comes before schedule
American Academy of Pediatrics safe-sleep guidance recommends putting infants on their backs for every sleep, in their own sleep space, on a firm and flat mattress with a fitted sheet. Keep pillows, loose blankets, bumpers, stuffed toys and other soft items out of the sleep space.
A bedtime calculation does not make an unsafe sleep surface safe and cannot assess breathing, illness or a medical sleep problem.
Baby sleep schedule questions
How much sleep does a baby need?
The AASM recommends 12–16 hours per 24 hours, including naps, for infants 4–12 months old. Individual needs vary within that range.
Why does the calculator not give a sleep target under 4 months?
The AASM did not issue one duration recommendation for babies younger than 4 months because sleep duration and patterns vary widely at that age.
How is the bedtime window calculated?
The tool subtracts the nap hours you enter from the age-based total sleep range, then counts the remaining nighttime sleep backward from the wake time. It is transparent sleep-budget math, not a prediction.
What is the safest sleep position for a baby?
AAP guidance recommends placing babies on their backs for every sleep on a firm, flat, noninclined sleep surface, without soft bedding, pillows, toys or other people in the sleep space.
Coordinate daytime care with the baby feeding schedule calculator, or explore all free tools for growing families.