1. What is the Pregnancy Due Date Calculator?

The Pregnancy Due Date Calculator estimates the expected delivery date based on the first day of your last menstrual period (LMP) using the standard 280-day pregnancy calculation method commonly used in Australia.

2. How Does the Calculator Work?

The calculator uses the Naegele's rule:

Where:

• \( LMP \) — First day of last menstrual period
• \( 280\ days \) — Standard duration of pregnancy (40 weeks)

Explanation: This calculation assumes a regular 28-day menstrual cycle with ovulation occurring on day 14. The actual delivery date may vary by ±2 weeks.

3. Importance of Due Date Calculation

Details: Knowing your estimated due date helps with pregnancy planning, scheduling prenatal tests at the correct times, and identifying potential preterm or post-term pregnancies.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period (LMP) in the format YYYY-MM-DD. The calculator will show your estimated due date and current gestational age.

5. Frequently Asked Questions (FAQ)

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

Q2: What if my cycle isn't 28 days?
A: For cycles longer or shorter than 28 days, adjustments may be needed. Consult your healthcare provider.

Q3: When will I have my dating scan?
A: In Australia, dating scans are typically performed between 8-12 weeks gestation.

Q4: Can the due date change?
A: Yes, your healthcare provider may adjust your due date based on ultrasound measurements in early pregnancy.

Q5: What's considered full term in Australia?
A: Between 37-42 weeks. Babies born before 37 weeks are considered preterm.