1. What Is Pregnancy Calculator Off Last Period?

The Pregnancy Calculator Off Last Period estimates the due date based on the first day of your last menstrual period (LMP). This method, known as Naegele's rule, adds 280 days (40 weeks) to the LMP date to calculate the estimated delivery date.

2. How Does The Calculator Work?

The calculator uses the standard obstetric calculation:

Where:

• Last Period Date — First day of last menstrual period
• 280 days — Standard gestation period (40 weeks)

Explanation: This calculation assumes a regular 28-day menstrual cycle and that conception occurred approximately 14 days after the last period.

3. Importance Of Due Date Calculation

Details: Accurate due date estimation is crucial for monitoring fetal development, scheduling prenatal care, preparing for delivery, and identifying potential preterm or post-term pregnancies.

4. Using The Calculator

Tips: Enter the first day of your last menstrual period in the date field. Ensure the date is accurate for the most reliable estimation. This method works best for women with regular menstrual cycles.

5. Frequently Asked Questions (FAQ)

Q1: How Accurate Is This Calculation Method?
A: This method provides a good estimate but may vary based on individual cycle length. Only about 5% of women deliver exactly on their estimated due date.

Q2: What If My Cycle Isn't 28 Days?
A: For cycles longer or shorter than 28 days, the calculation can be adjusted. Consult with your healthcare provider for a more personalized estimate.

Q3: When Should I Confirm With Ultrasound?
A: Early ultrasound (8-12 weeks) can provide a more accurate due date, especially if your cycles are irregular or LMP date is uncertain.

Q4: Can The Due Date Change?
A: Yes, healthcare providers may adjust the due date based on ultrasound measurements, especially if there's a significant difference from LMP calculation.

Q5: What's The Normal Delivery Range?
A: Most deliveries occur between 37-42 weeks gestation. A pregnancy is considered full-term at 37 weeks.