1. What Is LMP Calculator Based On EDD?

The LMP (Last Menstrual Period) Calculator Based On EDD calculates the first day of the last menstrual period when the estimated due date is known. This is commonly used in obstetrics to determine gestational age.

2. How Does The Calculator Work?

The calculator uses the standard pregnancy calculation:

Where:

• \( LMP \) — Last Menstrual Period (date)
• \( EDD \) — Estimated Due Date (date)
• \( 280 \) — Standard pregnancy duration in days

Explanation: This calculation assumes a 40-week (280-day) pregnancy duration from the first day of the last menstrual period.

3. Importance Of LMP Calculation

Details: Accurate LMP calculation is essential for determining gestational age, scheduling prenatal tests, monitoring fetal development, and planning for delivery.

4. Using The Calculator

Tips: Enter the estimated due date in the date field. The calculator will automatically compute the corresponding last menstrual period date.

5. Frequently Asked Questions (FAQ)

Q1: Why is 280 days used for pregnancy calculation?
A: 280 days represents the standard 40-week pregnancy duration calculated from the first day of the last menstrual period.

Q2: How accurate is this calculation?
A: This provides an estimate based on standard pregnancy duration. Actual delivery dates may vary by ±2 weeks.

Q3: What if I know my conception date instead of EDD?
A: If conception date is known, LMP is approximately 14 days before conception for women with regular 28-day cycles.

Q4: Does this work for irregular menstrual cycles?
A: The calculation assumes regular 28-day cycles. For irregular cycles, ultrasound dating is more accurate.

Q5: When should I consult a healthcare provider?
A: Always consult with a healthcare provider for accurate pregnancy dating and prenatal care guidance.