Tools · Sleep

Baby Sleep Calculator: How Much Sleep Does Your Baby Need by Age?

Free baby sleep calculator. Enter your baby's age to see recommended total sleep, naps, nap count, and wake windows — based on pediatric sleep guidance.

Select your baby's age

These are evidence-based average ranges, not strict targets. Every baby is different — use them as a flexible guide.

Baby Sleep Needs by Age (Full Chart)

Age	Total sleep	Night	Daytime naps	Naps/day	Wake window
Newborn (0–6 weeks)	14–17 hrs	8–9 hrs	7–9 hrs	4–6+	45–60 min
2–3 months	14–16 hrs	9–10 hrs	5–6 hrs	3–5	60–90 min
4–5 months	12–15 hrs	10–11 hrs	3–4 hrs	3	1.5–2.5 hrs
6–8 months	12–15 hrs	11 hrs	2.5–3.5 hrs	2–3	2–3 hrs
9–12 months	12–14 hrs	11 hrs	2–3 hrs	2	2.5–3.5 hrs
13–18 months	11–14 hrs	11 hrs	2–3 hrs	1–2	3–4 hrs
18–24 months	11–14 hrs	11 hrs	2 hrs	1	4–6 hrs
2–3 years	10–13 hrs	11 hrs	1–2 hrs	0–1	5–6 hrs

Frequently Asked Questions

How accurate is a baby sleep calculator?

A sleep calculator gives evidence-based averages from pediatric guidance, but every baby is different. Use the numbers as a flexible guide, not a strict rule. Some healthy babies need a little more or less than the typical range — watch your baby's mood and energy rather than chasing exact hours.

What is a wake window?

A wake window is the amount of time a baby can comfortably stay awake between sleeps before becoming overtired. Wake windows grow with age — from about 45–60 minutes for newborns to 5–6 hours for toddlers. Timing sleep to your baby's wake window is one of the most effective ways to make settling easier.

Does daytime sleep count toward total sleep?

Yes. The total sleep figure includes both night sleep and daytime naps combined. As babies get older, more of their total sleep shifts to nighttime and nap time gradually decreases until naps are dropped entirely, usually between ages 3 and 5.

My baby sleeps less than recommended — should I worry?

Ranges are averages, so a baby slightly outside them can still be perfectly healthy, especially if they are happy, growing well, and generally content. If your baby is consistently far below the range, seems chronically overtired, or you are concerned, it is worth discussing with your pediatrician.