1. What Is Pregnancy Calculator Accuracy?

Pregnancy calculator accuracy refers to how closely the estimated due date (EDD) calculated from the last menstrual period (LMP) matches actual delivery dates. The standard calculation of LMP + 280 days has approximately 95% accuracy when delivery occurs within 2 weeks of the estimated date.

2. How Does The Calculator Work?

The calculator uses the standard pregnancy calculation formula:

Where:

• \( EDD \) — Estimated Due Date
• \( LMP \) — Last Menstrual Period
• \( 280 \text{ days} \) — Standard pregnancy duration
• \( 2 \text{ weeks} \) — Acceptable variance window
• \( 95\% \) — Base accuracy rate

Explanation: The calculator compares your calculated EDD with standard medical calculation and assesses accuracy based on how closely they align within the 2-week variance window.

3. Importance Of EDD Accuracy

Details: Accurate EDD calculation is crucial for proper prenatal care timing, monitoring fetal development milestones, scheduling important tests, and preparing for delivery. It helps healthcare providers identify potential complications and ensure optimal care throughout pregnancy.

4. Using The Calculator

Tips: Enter your last menstrual period date and estimated due date. The calculator will assess the accuracy of the EDD calculation based on standard medical guidelines. Ensure dates are entered in the correct format (YYYY-MM-DD).

5. Frequently Asked Questions (FAQ)

Q1: Why is there only 95% accuracy with the standard calculation?
A: Only about 5% of women deliver exactly on their due date. The 95% accuracy reflects deliveries occurring within 2 weeks before or after the estimated date.

Q2: What factors affect pregnancy calculator accuracy?
A: Irregular menstrual cycles, incorrect LMP recall, variations in ovulation timing, and individual biological differences can all affect accuracy.

Q3: How can EDD accuracy be improved?
A: Early ultrasound dating (especially first-trimester) provides the most accurate EDD estimation, often correcting LMP-based calculations.

Q4: What if my dates don't match the calculation?
A: Consult your healthcare provider. They may recommend an ultrasound to confirm dating, especially if there's significant discrepancy.

Q5: Is the LMP method reliable for all women?
A: It's most reliable for women with regular 28-day cycles. Women with irregular cycles may need ultrasound confirmation for accurate dating.