A standard estimated due date is 280 days from the first day of the last menstrual period.
Enter your cycle details
The calculation uses 40 weeks and adjusts for your average cycle length.
Enter the first day of your last period to estimate your due date, current pregnancy week, trimester, and approximate baby size.
Calculate your due dateThe calculation uses 40 weeks and adjusts for your average cycle length.
This page goes beyond a single date. It summarizes the current week, trimester, approximate size, and key pregnancy dates in easy-to-read cards.
A standard estimated due date is 280 days from the first day of the last menstrual period.
The due date and related pregnancy dates adjust in the same direction as your average cycle length.
Dates are displayed with English month names so they are easy to read and share.
Move easily from cycle tracking to ovulation, gestational age, due date, conception date, and a week-by-week chart.
All results are estimates intended to provide a helpful overview. They do not replace an ultrasound, diagnosis, or medical advice. Length is shown around a weekly reference value. Weight ranges from week 22 use the 10th-90th percentiles from the INTERGROWTH-21st standard.
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