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The Global Insight

Is the due date the same as the estimated due date?

Author

John Hall

Updated on February 06, 2026

The due date, also known as the estimated date of confinement, is an estimation of when a pregnant woman will deliver her baby. While the due date is often estimated as a single date, it can be helpful to consider a range of due dates, since only 4% of births occur on the estimated due date. 1

What’s the difference between 12 am and 12 noon?

By convention, 12 AM denotes midnight, while 12 PM denotes noon. Using the terms “12 midnight” and “12 noon” can remove ambiguity in cases where a person may not be accustomed to conventions. A 24-hour clock typically uses the numbers 0-23, where 00:00 indicates midnight, and a day runs from midnight to midnight over the course of 24 hours.

How is the due date of a pregnant woman calculated?

Pregnancy Due Date Calculator How is my due date calculated? Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle). Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy.

What happens if you deliver on your due date?

If you deliver on your due date, your baby is actually only 38 weeks old, not 40. Please remember that your due date is only an estimate. Every pregnancy is unique and your baby will come when it’s ready. Be sure to talk to your health care provider about your due date. On average only 5% of births take place exactly on the estimated due date.

When is the due date for Your Baby?

Your due date is December 15, 2020. Congratulations! You are 5 weeks and 5 days pregnant. Recalculate your due date. Did You Know? Only 1 in 20 babies are born on their actual due date. A normal pregnancy often lasts from 38 to 42 weeks, which keeps the majority of parents guessing right up until delivery day.

How is conception date used to calculate due date?

Using conception date to estimate due date is similar to using last menstrual period, except for a difference of about two weeks in the point of measurement, based on the timing between the last menstrual period and the date of conception.

How big was the 15th edition of the Dewey Decimal System?

The 15th edition, edited by Milton Ferguson, implemented the growing concept of the “standard edition”, designed for the majority of general libraries but not attempting to satisfy the needs of the very largest or of special libraries. It also reduced the size of the Dewey system by over half, from 1,900 to 700 pages.