Free baby calculators for parents
Estimate due dates, formula amounts and growth percentiles, or explore sleep ranges and corrected age. No sign-up needed; calculations run in your browser.
These are the quick calculations parents ask about most. The growth percentile calculator uses the WHO Child Growth Standards, the nap schedule and sleep calculators use the same age-based wake windows and sleep ranges as Plumi's Sleep Forecast, and the due date calculator applies the standard 40-week estimate from your last period, conception date or IVF transfer. The feeding calculator gives a weight-based starting point for formula amounts, and the solids quiz walks through the readiness signs pediatric guidance describes.
Every result is an estimate, not advice for your baby. Growth, sleep and feeding vary a lot between healthy babies, so use the numbers as context for a conversation with your pediatrician. Nothing you enter leaves your browser. If you want the same calculations kept up to date automatically, the Plumi app does them from your baby's own log.
Due Date Calculator
Estimate your baby’s due date from your last period, conception, or IVF transfer.
Open →Baby Feeding Calculator
Estimate daily and per-feed formula amounts from your baby's weight.
Open →Baby Sleep Needs Calculator
See typical sleep ranges for your baby's age.
Open →Nap Schedule Generator
A sample day of naps and bedtime from your baby’s age and wake-up time.
Open →Growth Percentile Calculator
Estimate weight, length or head circumference percentiles using WHO charts.
Open →Corrected Age Calculator
For babies born early. Work out your baby’s corrected age from their due date.
Open →Ready for Solids Quiz
Is your baby ready for solids? Four quick questions on age and the three readiness signs.
Open →
Keep track of your baby's day
Log feeds, sleep, diapers and more for free. No account needed to start.
