Weeks Gestation Calculator



Calculating weeks of gestation is crucial for monitoring the progress of pregnancy. A Weeks Gestation Calculator simplifies this process, providing an accurate estimate based on the last menstrual period (LMP). In this article, we will guide you through the usage of a simple calculator implemented in HTML and JavaScript.

How to Use

To use the Weeks Gestation Calculator, enter the date of the last menstrual period in the input field. Click the “Calculate” button, and the result will be displayed instantly. It’s a user-friendly tool designed for quick and efficient gestation tracking.


The most accurate formula for calculating gestational weeks is:


Suppose the last menstrual period started on January 1, 2024, and the current date is January 12, 2024. By applying the formula:

The result is 1 week of gestation.


Q1: How accurate is the Weeks Gestation Calculator?
A1: The calculator employs a precise formula, making it highly accurate for estimating gestational weeks.

Q2: Can it be used at any stage of pregnancy?
A2: Yes, the calculator is designed to be effective at any point during pregnancy.

Q3: Is it necessary to input the exact LMP date?
A3: While it’s ideal to input the accurate LMP date, a close approximation can still provide a reliable estimate.

Q4: Does the calculator consider leap years?
A4: Yes, the formula accounts for leap years, ensuring accurate results.


In conclusion, the Weeks Gestation Calculator is a handy tool for monitoring pregnancy progress. With a precise formula and easy-to-use interface, it offers a quick estimate of gestational weeks. Whether you are a healthcare professional or an expectant parent, this calculator simplifies the process, providing valuable insights into the pregnancy timeline.

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