1. What is Pregnancy Date Calculation?

The pregnancy date calculator estimates the due date based on the last menstrual period (LMP) using Naegele's rule, which adds 280 days (40 weeks) to the first day of the LMP.

2. How Does the Calculator Work?

The calculator uses the standard formula:

Where:

• 280 days represents 40 weeks of gestation
• Calculation assumes a regular 28-day menstrual cycle
• Ovulation is assumed to occur at day 14

3. Importance of Due Date Calculation

Details: Accurate due date estimation is crucial for prenatal care scheduling, monitoring fetal development, and determining the optimal time for certain tests and procedures.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period in the date field. The calculator will estimate your due date and current gestation period.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: It provides an estimate - only about 5% of women deliver on their exact due date. Most deliver within 2 weeks before or after.

Q2: What if my cycles aren't regular?
A: For irregular cycles, early ultrasound dating is more accurate than LMP-based calculation.

Q3: Why 280 days?
A: This represents 40 weeks from LMP (which includes approximately 2 weeks before conception actually occurs).

Q4: How is this different from conception date?
A: Conception typically occurs about 2 weeks after LMP, so conception date would be LMP + 14 days.

Q5: Can this be used for IVF pregnancies?
A: For IVF, use the embryo transfer date plus 266 days (or 263 days for day 5 embryos).