Gestational Age Calculator

This Gestational Age Calculator allows users to determine their current gestational age, estimated due date, and important trimester milestones based on their last menstrual period and menstrual cycle length.

Use Our Gestational Age Calculator

How to Use the Gestational Age Calculator

This guide will walk you through the steps to effectively use the Gestational Age Calculator to estimate key pregnancy-related dates.

Step 1: Enter Last Menstrual Period Date

  • Field: First Day of Last Menstrual Period
  • Type: Date
  • Instructions: Use the date picker to select the first day of your last menstrual period. This date is crucial as it serves as the starting point for all calculations. Ensure the date is not in the future.

Step 2: Enter Average Menstrual Cycle Length

  • Field: Average Menstrual Cycle Length (days)
  • Type: Number
  • Instructions: Enter the average length of your menstrual cycle in days. The range should be between 20 and 45 days, and only whole numbers are accepted. This input helps to fine-tune the estimated conception date.

Step 3 (Optional): Enter Ultrasound Information

If you have had an ultrasound, you can provide additional details to refine the gestational age estimate.

  • Field: Ultrasound Date
  • Type: Date
  • Instructions: Enter the date when the ultrasound was performed. This is optional, but it can enhance the accuracy of the gestational age.
  • Field: Gestational Age at Ultrasound (weeks)
  • Type: Number
  • Instructions: Enter the gestational age reported during your ultrasound in weeks. The acceptable range is 0 to 42 weeks.

Step 4: View Results

Once you have provided the necessary inputs, the calculator will immediately provide the following insights:

  • Current Gestational Age: This displays how many weeks pregnant you are as of today.
  • Days in Current Week: This shows the number of days into the current week of pregnancy.
  • Estimated Due Date: Calculated based on a 280-day gestation period from the first day of your last menstrual period.
  • First Trimester Ends: Indicates the date when the first trimester is complete, calculated as 91 days from the last period date.
  • Second Trimester Ends: Marks the end of the second trimester, 189 days from the last period date.
  • Estimated Conception Date: Based on your menstrual cycle length, this suggests the estimated conception date.
  • Days Remaining Until Due Date: Shows the number of days until the estimated due date.