Wake window calculator
Pick your baby’s age, add the time they woke up, and get the suggested window for their next nap.
When is the next nap?
Next nap window
Pick your baby’s age
Then add the time they woke up. The next nap window appears right here.
How the calculation works
Each age has a typical wake window: the span of time babies that age usually stay awake between sleeps. The calculator adds the short end and the long end of that range to your baby’s wake-up time. The result is the window when the next nap is likely to go most smoothly.
After the nap, start again from the new wake-up time. That’s the whole method, and it’s exactly what the Wake Window app does each time you tap “Baby Woke Up”.
The ranges it uses
| Age | Suggested wake window |
|---|---|
| 0–1 month | 30–60 min |
| 1–2 months | 60–90 min |
| 3–4 months | 1 hr 15 min – 2 hr |
| 5–6 months | 2 hr – 2 hr 45 min |
| 7–9 months | 2 hr 30 min – 3 hr 30 min |
| 10–13 months | 3 hr – 4 hr |
| 14–18 months | 4 hr – 5 hr 30 min |
Ages are completed months, so a baby who is 4 months and 3 weeks uses the 3–4 month range. See every age explained.
Common questions
What do I enter?
Your baby's age and the time they last woke up, whether that's in the morning or after a nap. The calculator adds the typical wake window for that age.
Why is the answer a window and not one time?
Babies vary, and so do days. A range gives you a sensible span to start winding down and watching for tired cues, rather than a single deadline.
What if my baby is older than 18 months?
The age-based ranges stop at 18 months. By then most children have their own rhythm. The Wake Window app lets you set a custom wake window.
Does the calculator store anything?
No. It runs in your browser. Nothing you enter is saved or sent anywhere.
