Estimated Date of Delivery Calculator

Calculate your estimated delivery date based on your last menstrual period or conception date.

Calculation Method: Last Menstrual Period (LMP) Conception Date Ultrasound Date

First Day of Last Menstrual Period:

Please enter a valid date

Average Length of Cycles: 28 days (average) 21 days 22 days 23 days 24 days 25 days 26 days 27 days 29 days 30 days 31 days 32 days 33 days 34 days 35 days

Date of Conception:

Please enter a valid date

Date of Ultrasound:

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Gestational Age at Ultrasound (weeks):

Please enter a value between 6 and 20

Your Estimated Due Date

January 1, 2023

You are currently 10 weeks pregnant

You are in your 1st trimester

280 days left until your due date

Understanding Due Date Calculation

Your estimated due date (EDD) is calculated based on your last menstrual period, conception date, or ultrasound measurements. A typical pregnancy lasts about 40 weeks from the first day of your last menstrual period.

Last Menstrual Period Method

Adds 280 days (40 weeks) to the first day of your last period, assuming a 28-day cycle.

Conception Date Method

Adds 266 days (38 weeks) to your conception date.

Ultrasound Method

Uses measurements from early ultrasound to determine gestational age and calculate due date.

Pregnancy is an exciting journey, and knowing when your baby is expected to arrive is essential for planning. The Estimated Date of Delivery (EDD) Calculator helps predict the due date based on the mother's last menstrual period (LMP) or ultrasound results.

What is EDD?

Estimated Date of Delivery (EDD) is the approximate date when a pregnant woman is expected to give birth. It is usually calculated based on the first day of the last menstrual period (LMP) and assumes a 40-week pregnancy cycle.

How is the Due Date Calculated?

The most common method for calculating EDD is Naegele’s Rule, which follows these steps:

EDD = LMP + 280 days (or 40 weeks)

Where:

• LMP: First day of the last menstrual period
• 280 days: The average length of a full-term pregnancy

Alternative Methods for EDD Calculation

Besides Naegele’s Rule, doctors may estimate the due date using:

• Ultrasound Scan: Measures fetal growth and development.
• Conception Date: If known, add 266 days to determine EDD.
• IVF Transfer Date: For IVF pregnancies, due dates are based on embryo transfer.

Why is the EDD Important?

Knowing the Estimated Date of Delivery is important for:

• Tracking pregnancy progress and fetal growth.
• Scheduling prenatal checkups and necessary medical tests.
• Preparing for labor, delivery, and postnatal care.
• Ensuring proper nutrition and health monitoring.

Factors That May Affect the Due Date

Although the EDD provides an estimated timeframe, several factors can influence the actual delivery date:

• Irregular menstrual cycles: Can affect the accuracy of LMP-based calculations.
• Multiple pregnancies: Twins or triplets often arrive earlier.
• First-time mothers: May experience longer pregnancies.
• Health conditions: Conditions like gestational diabetes or preeclampsia may lead to early delivery.

How Accurate is the EDD Calculator?

While the EDD Calculator provides a useful estimate, only about 4% of babies are born on their exact due date. The majority of births occur within a two-week window before or after the estimated date.

Conclusion

The Estimated Date of Delivery (EDD) Calculator is a valuable tool for expecting mothers. It helps them prepare for the arrival of their baby while ensuring proper prenatal care. However, since every pregnancy is different, regular medical checkups are essential for monitoring progress and ensuring a healthy delivery.