Free tool
Put in the first day of your last period. You get the due date, the week you are in today, and how long is left.
one date, and everything around it
It is an estimate, and it is the same one midwives start from: forty weeks from the first day of your last period. The date that counts is the one from your dating scan, and it can move by a few days. Fewer than one baby in twenty is born on the due date — being early or late is the normal case, not the exception.
Forty weeks — 280 days — counted from the first day of your last period, plus or minus the difference if your cycle is not 28 days. It assumes you ovulated around day 14, which is why a scan measurement beats it.
From here on the app follows the weeks for you: what changes this week, which scans come when, and a page of the album to fill in each week.
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