Pregnancy Due Date
Estimate your likely due date and weeks of pregnancy (Naegele's rule).
Estimate: last period + 280 days. Confirm with your doctor.
Pick a date.
How it works
Estimate the due date from the first day of the last menstrual period using Naegele’s rule.
Frequently asked questions
How is the due date estimated?
Naegele’s rule adds about 280 days to the first day of the last menstrual period.
Is the date exact?
It is an estimate; birth can naturally occur earlier or later.
What about an irregular cycle?
The last-period estimate is less reliable and should be confirmed by a healthcare professional.