Pregnancy Due Date Calculator Week By Week

Pregnancy Due Date Calculation:

\[ EDD = LMP + 280 \text{ days} \] \[ Week = \lfloor (\text{Current Date} - LMP) \div 7 \rfloor \]

Estimated Due Date (EDD):

Current Pregnancy Week:

Days Since LMP:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What Is Pregnancy Due Date Calculation?

Pregnancy due date calculation estimates the expected delivery date based on the first day of the last menstrual period (LMP). The standard calculation adds 280 days (40 weeks) to the LMP date, providing a week-by-week timeline of pregnancy progression.

2. How Does The Calculator Work?

The calculator uses the standard pregnancy calculation formulas:

\[ EDD = LMP + 280 \text{ days} \] \[ Week = \lfloor (\text{Current Date} - LMP) \div 7 \rfloor \]

Where:

\( EDD \) — Estimated Due Date (date)
\( LMP \) — Last Menstrual Period (date)
\( Current Date \) — Today's date or specified date (date)
\( Week \) — Current pregnancy week (weeks)

Explanation: This method assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. The calculation provides week-by-week tracking of pregnancy progression.

3. Importance Of Due Date Calculation

Details: Accurate due date calculation is essential for monitoring fetal development, scheduling prenatal care, preparing for delivery, and identifying potential pregnancy complications. It helps healthcare providers track appropriate growth milestones.

4. Using The Calculator

Tips: Enter the first day of your last menstrual period and the current date (or any date you want to check). The calculator will provide your estimated due date and current pregnancy week. Ensure dates are entered in the correct format.

5. Frequently Asked Questions (FAQ)

Q1: How Accurate Is The Due Date Calculation?
A: The calculation is accurate for women with regular 28-day cycles. Only about 5% of babies are born exactly on their due date, with most deliveries occurring within two weeks before or after.

Q2: What If My Cycle Is Not 28 Days?
A: For irregular cycles, the calculation may need adjustment. Ultrasound dating in early pregnancy often provides more accurate dating than LMP-based calculations.

Q3: When Should I Confirm With Ultrasound?
A: Early ultrasound (8-12 weeks) is recommended to confirm dating, especially if cycle dates are uncertain or if there are discrepancies in size measurements.

Q4: Can The Due Date Change?
A: Yes, healthcare providers may adjust the due date based on ultrasound findings, especially if there's more than a 5-7 day difference from LMP dating in the first trimester.

Q5: What Are The Pregnancy Trimesters?
A: First trimester: weeks 1-13, Second trimester: weeks 14-27, Third trimester: weeks 28-40+. Each trimester has specific developmental milestones and care requirements.