1. What Is NZ Week By Week?

NZ Week By Week is a pregnancy calculator that determines the number of weeks pregnant based on the last menstrual period (LMP) and current date. It follows the standard New Zealand method for calculating gestational age.

2. How Does The Calculator Work?

The calculator uses the formula:

Where:

• \( \text{LMP} \) — Last menstrual period date
• \( \text{Current Date} \) — Today's date or any specified date
• \( \left\lfloor \right\rfloor \) — Floor function (rounds down to nearest whole number)

Explanation: The calculation determines the complete weeks that have passed since the first day of your last menstrual period.

3. Importance Of Pregnancy Week Calculation

Details: Accurate week-by-week tracking is essential for monitoring fetal development, scheduling prenatal appointments, determining due dates, and ensuring appropriate medical care throughout pregnancy.

4. Using The Calculator

Tips: Enter the first day of your last menstrual period and the current date (defaults to today). The calculator will display the number of completed weeks of pregnancy.

5. Frequently Asked Questions (FAQ)

Q1: Why use LMP instead of conception date?
A: LMP is used because it's easier to recall and provides a standardized method for calculating gestational age across healthcare providers.

Q2: How accurate is this calculation?
A: This provides a good estimate, but ultrasound measurements in early pregnancy are more accurate for determining gestational age.

Q3: What if I don't know my exact LMP?
A: Use your best estimate. An early pregnancy ultrasound can provide a more accurate gestational age if LMP is uncertain.

Q4: Does this work for irregular cycles?
A: The calculation assumes a standard 28-day cycle. Women with irregular cycles may need ultrasound confirmation for accurate dating.

Q5: When should I see a healthcare provider?
A: Contact a healthcare provider as soon as you suspect pregnancy for proper prenatal care and confirmation.