This calculator has been superseded
This older fetal-age calculator is no longer the preferred Perinatology.com tool for calculating gestational age on a specific date.
Please use the updated Due Date and Gestational Age Calculator instead.
Open the updated Due Date and Gestational Age CalculatorHow to calculate gestational age on a specific date
- Open the updated calculator: Due Date and Gestational Age Calculator.
- Enter the pregnancy dating information, such as LMP, ultrasound dating, known EDD, or assisted-reproduction dating, as appropriate.
- Use the section labeled Enter Date for Gestational Age Calculation.
- Enter the date for which gestational age is needed, then calculate to display the gestational age on that date.
Recommended replacement: https://www.perinatology.com/calculators/Due-Date.htm
This page is retained only to direct users and search engines to the current calculator.
Why this page is archived
This legacy calculator estimated fetal age on a selected date from LMP or a known EDD. The newer Due Date and Gestational Age Calculator provides the preferred workflow for dating and gestational-age calculations on Perinatology.com.
For clinical use, confirm all dating inputs and results before relying on calculated gestational age.
Created: 11/10/2002. Updated 2026 as a superseded, noindex page.
All calculations must be confirmed before use. Calculator results are not a substitute for clinical judgment.