Gestational Age Calculator

Choose Calculation Method: By Last Menstrual Period (LMP) By Estimated Due Date (EDD) By IVF Transfer Date

Enter Date:

Calculate Gestational Age

What Is a Gestational Age Calculator?

A gestational age calculator is a digital tool that estimates how far along a pregnancy is, typically in weeks and days. It uses various inputs like the last menstrual period (LMP), expected due date (EDD), IVF transfer date, or ultrasound measurements (like CRL or BPD) to determine the baby’s gestational age.

Accurate gestational age is crucial for tracking fetal development, planning prenatal care, and anticipating key milestones in pregnancy.

How to Use the Gestational Age Calculator

1. Select your calculation method – LMP, EDD, or IVF transfer date.
2. Enter the date relevant to your selected method.
3. Click “Calculate Gestational Age”.
4. Get an instant estimate in weeks and days.

This tool offers flexibility and accuracy whether you’re using a clinical approach or home tracking.

Gestational Age Calculation Methods Explained

• By LMP: The most common and traditional method used in early pregnancy.
• By EDD: Calculates backwards from the expected delivery date (40 weeks prior).
• By IVF: Accounts for embryo transfer, with fertilization usually considered 14 days before.
• By Ultrasound (CRL/BPD): CRL (Crown-Rump Length) and BPD (Biparietal Diameter) can be used by healthcare professionals for precise gestational dating.
• Apps and Tools: Mobile gestational age calculator apps and web tools like ours help track progress daily.
• Medi Mouse or Custom Devices: Some clinical environments use gestational age calculator medi mouse tools for physical charting.

FAQs About Gestational Age

How is gestational age calculated in ultrasound?

Ultrasound estimates fetal age using biometric measurements like CRL or BPD, especially effective in the first trimester.

What is the difference between fetal age and gestational age?

Gestational age starts from the last menstrual period, whereas fetal age starts from conception—typically about 2 weeks later.

How to calculate gestational age from IVF?

Subtract 14 days from the embryo transfer date and calculate from there as if it were an LMP.

Can I use this calculator if I don’t remember my LMP?

Yes! Use the calculator via due date, IVF date, or consult an ultrasound-based method.

How accurate is a gestational age calculator?

When paired with medical data, it provides a reliable estimate, especially in early pregnancy.