Due Date Calculator Months And Weeks

Due Date Calculation:

\[ EDD = LMP + 280 \text{ days} \] \[ \text{Weeks} = \left\lfloor \frac{\text{Current Date} - LMP}{7} \right\rfloor \]

Estimated Due Date (EDD):

Current Pregnancy Weeks:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Due Date Calculation?

Due date calculation estimates the expected delivery date based on the last menstrual period (LMP). The standard calculation adds 280 days (40 weeks) to the LMP date to determine the estimated due date (EDD).

2. How Does the Calculator Work?

The calculator uses the following formulas:

\[ EDD = LMP + 280 \text{ days} \] \[ \text{Weeks} = \left\lfloor \frac{\text{Current Date} - LMP}{7} \right\rfloor \]

Where:

\( EDD \) — Estimated Due Date
\( LMP \) — Last Menstrual Period date
\( \text{Current Date} \) — Today's date or any specified date
\( \text{Weeks} \) — Number of completed weeks of pregnancy

Explanation: The calculation is based on the standard 40-week pregnancy duration from the first day of the last menstrual period.

3. Importance of Due Date Calculation

Details: Accurate due date calculation is crucial for prenatal care planning, monitoring fetal development, scheduling tests and screenings, and preparing for delivery.

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 the estimated due date and current pregnancy duration in weeks.

5. Frequently Asked Questions (FAQ)

Q1: Why is the calculation based on LMP rather than conception date?
A: LMP is used because it's typically easier to recall and provides a standardized reference point for pregnancy dating.

Q2: How accurate is the 280-day calculation?
A: This provides an estimate. Only about 5% of women deliver exactly on their due date, but 80% deliver within 2 weeks of the estimated date.

Q3: What if I don't know my LMP exactly?
A: An ultrasound in early pregnancy can provide a more accurate due date estimation based on fetal measurements.

Q4: Why are pregnancy weeks calculated from LMP rather than conception?
A: Medical professionals use gestational age (from LMP) rather than fetal age (from conception) for consistency in pregnancy dating.

Q5: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on ultrasound measurements, especially if there's a significant discrepancy from the LMP-based calculation.