Weekly Pregnancy Calculator



Calculating the weekly progress of pregnancy is a crucial aspect for expectant mothers and healthcare providers. A Weekly Pregnancy Calculator simplifies this process, offering an efficient way to estimate the gestational age and due date. In this article, we’ll explore how to use and implement a Weekly Pregnancy Calculator using HTML and JavaScript.

How to Use

To use the Weekly Pregnancy Calculator, enter the first day of your last menstrual period (LMP) in the provided input field. Click the “Calculate” button to obtain an accurate estimate of your current week of pregnancy and the expected due date.


The calculation is based on the standard Naegele’s Rule, which estimates the due date by adding 280 days (40 weeks) to the first day of the last menstrual period. The formula is as follows:


Assuming the last menstrual period started on January 1, 2024:

This means the estimated due date would be October 7, 2024.


Q1: How accurate is the Weekly Pregnancy Calculator?

The calculator provides a reasonably accurate estimation based on the Naegele’s Rule. However, individual variations may exist.

Q2: Can the calculator be used for irregular menstrual cycles?

While it gives a general estimate, irregular cycles may affect accuracy. Consult with a healthcare professional for precise information.

Q3: Is it suitable for all pregnancy stages?

Yes, the calculator is designed for use throughout pregnancy to estimate the gestational age and due date.


In conclusion, the Weekly Pregnancy Calculator serves as a handy tool for expectant mothers to estimate their due dates. It simplifies the complex calculations involved, providing a quick and reliable result. Remember that this tool offers estimates and it’s always advisable to consult with a healthcare professional for personalized information.

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