1. What Is EDD LMP?

EDD LMP (Estimated Due Date from Last Menstrual Period) calculates the expected delivery date by adding 280 days (40 weeks) to the first day of the last menstrual period. This is the most common method used to estimate pregnancy due dates.

2. How Does The Calculator Work?

The calculator uses the standard EDD LMP formula:

Where:

• \( EDD \) — Estimated Due Date
• \( Last Menstrual Period \) — First day of last menstrual period
• \( 280 days \) — Standard pregnancy duration (40 weeks)

Explanation: This calculation assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. The 280 days represent the typical gestation period from the last menstrual period.

3. Importance Of EDD Calculation

Details: Accurate due date estimation is crucial for proper prenatal care, monitoring fetal development, scheduling important tests, and preparing for delivery. It helps healthcare providers track pregnancy progress and identify potential complications.

4. Using The Calculator

Tips: Enter the first day of your last menstrual period in the date field. Ensure the date is accurate for the most reliable due date estimation. The calculator will provide the estimated delivery date based on the standard 280-day pregnancy duration.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the EDD LMP method?
A: The EDD LMP method is generally accurate for women with regular 28-day cycles. However, individual variations in cycle length and ovulation timing can affect accuracy.

Q2: What if my menstrual cycle is irregular?
A: For irregular cycles, the EDD LMP may be less accurate. An early ultrasound (first trimester) often provides a more reliable due date estimate.

Q3: Why 280 days instead of 9 months?
A: 280 days equals 40 weeks, which is the standard medical calculation. Calendar months vary in length, so weeks provide more consistent measurement.

Q4: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on early ultrasound measurements, especially if there's a significant difference from the LMP calculation.

Q5: What percentage of babies are born on their due date?
A: Only about 5% of babies are born exactly on their due date. Most births occur within two weeks before or after the estimated due date.