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Free baby tools and calculators
The four questions new parents look up most, answered in a few seconds. Every number here comes from published health guidance and links back to its source, so you can check it yourself — or show it to someone who asks.
Wake window calculator
How long should my baby be awake between naps?
Work out how long your baby can comfortably stay awake, and when the next nap is likely to land. Free wake window chart from newborn to 24 months, with the published ranges for every age.
Feeding amount calculator
How much milk does my baby need per day?
Estimate how much formula your baby needs per day and per feed, based on the published 150–200 ml per kilogram guidance, plus a feeding chart by age from the first week to 12 months.
Nappy count checker
How many wet nappies should my baby have a day?
Check how many wet and dirty nappies are expected at your baby's age, day by day through the first week and beyond, plus the signs of dehydration that mean you should get advice today.
Baby age calculator
How old is my baby in weeks and months?
Convert your baby's date of birth into weeks, months and days — the way health checks, milestone charts and sleep guides count it — including corrected age for babies born preterm.
Why we give these away for free
Every one of these calculations is something BubSync already does for you in the app, using your baby's own logged data instead of a generic chart. We put them here because a parent at 3 am should not have to install anything to find out whether five wet nappies is enough.
If they help, the app does the same job continuously — and keeps everyone caring for your baby looking at the same numbers.
See how BubSync works