Tools & calculators
Free, evidence-based pregnancy and parenting calculators — each one shows the method it uses, is reviewed against clinical guidance, and comes with a plain-language explainer.
Pregnancy Due Date Calculator (When Will Your Baby Arrive?)
Estimate your due date, today's gestational age and trimester from your last period or conception date.
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How Far Along Am I? Pregnancy Weeks Calculator
Turn your due date into today's gestational age — weeks, days, trimester and how much of the pregnancy is done.
Reverse Due Date Calculator (Find Your Conception Date)
Work backwards from a due date or a birth date to your estimated conception and last-period dates.
Your Ovulation & Fertile Window Calculator
Estimate your likely ovulation day and fertile window from your last period and average cycle length.
Pregnancy Weight Gain Calculator (By Pre-Pregnancy BMI)
See your recommended total gain and weekly pace by pre-pregnancy BMI, using the IOM 2009 guidelines.
Contraction Timer & 5-1-1 Labor Tracker
Track contraction length and spacing and see when the 5-1-1 pattern suggests it's time to call your provider.
Baby Age Calculator (In Weeks, Months and Days)
Enter a birth date to see your baby's exact age in months and weeks, plus total days, weeks and months.
Baby Weight & Percentile Growth Calculator
Plot your baby's weight against WHO growth standards to understand which percentile they sit in.
Baby Sleep Schedule & Wake Windows by Age
Get recommended total sleep, a typical nap count and age-appropriate wake windows from newborn to toddler.
Breast Milk Storage Calculator: How Long Expressed Milk Lasts
See how long expressed milk lasts at room temperature, in the fridge or freezer, and label your batches.