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Due date calculator

  • Last menstrual time: year month day
  • Average menstrual cycle: week
Calculation of due date
  • Your due date is:
  • You are now at the first stage of pregnancy week
The due date calculator can quickly and easily complete your due date calculation based on your menstrual cycle, telling you when you are most likely to give birth, and when is the due date? It is convenient for expectant mothers to prepare for the advent of the baby.

Expected Date Calculator Principle

How to calculate the expected period, the expected period is calculated from the date of the first day of the last menstrual period. The expected birth period is calculated as follows: the expected birth period is the number of months of the last menstruation plus 9 (or minus 3), and the number of days plus 7. The last menstrual period was March 20, 2011, and the due date was December 27, 2011. Full-term pregnancy is about 280 days (about 40 weeks), and delivery within the first two weeks or the next two weeks of the due date is normal. If the menstrual cycle before pregnancy is irregular, or the cycle is long, it is recommended to take the B-ultrasound as the standard. However, the B-ultrasound usually has an error of about one week.

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