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Gestational Age Calculator

Calculate gestational age (weeks + days), estimated due date (EDD), trimester, and key milestones — using LMP, EDD, ultrasound, conception date, or IVF transfer.

Today:

Gestational Age

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Fetal Age

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Estimated Due Date (EDD)

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Progress: 0%
Trimester: —

Milestones

MilestoneDateFrom today

• Gestational age is calculated from LMP. If your cycle is not 28 days, the tool adjusts LMP by (cycle − 28) days.
• When using EDD / ultrasound / IVF, the tool converts those inputs to an equivalent LMP before calculating.
• For medical advice, consult your healthcare provider.

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About the Gestational Age Calculator

The Gestational Age Calculator is a simple yet powerful tool designed to estimate how far along a pregnancy is. By entering the date of the mother’s Last Menstrual Period (LMP), the calculator quickly determines the gestational age in weeks and days, along with the estimated due date. This helps expectant parents, healthcare providers, and anyone planning prenatal care get accurate information instantly.

How It Works

  1. Based on LMP (Last Menstrual Period) – The tool uses the standard obstetric calculation method, which assumes an average pregnancy lasts 280 days (40 weeks) from the first day of the last menstrual period.

  2. Date Calculation – From the LMP date you provide, the calculator counts the total days passed to determine gestational age, and adds 280 days to estimate the due date.

  3. Quick and Accurate – The method aligns with common clinical practice and is widely accepted for estimating pregnancy progress, especially in the early weeks.

💡 Note: This tool provides an estimate only and should not replace professional medical advice or ultrasound confirmation.

Frequently Asked Questions

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A Gestational Age Calculator is an online tool that estimates how far along a pregnancy is in weeks and days. It also calculates the estimated due date (EDD), trimester, and key pregnancy milestones.

Gestational age is calculated from the first day of the last menstrual period (LMP), not the conception date. The calculator counts the number of days from LMP to today and expresses it in weeks and days.

You can calculate gestational age using multiple methods, including:

- Last Menstrual Period (LMP)
- Estimated Due Date (EDD)
- Conception date
- Ultrasound results
- IVF transfer date

If your cycle is shorter or longer than 28 days, the calculator adjusts the LMP accordingly to improve accuracy.

Yes. You can use alternative inputs such as:

- Due date
- Ultrasound measurements
- IVF transfer date
- The tool converts these into an equivalent LMP to calculate gestational age.

No. This tool provides estimates only. Always consult a healthcare professional for accurate diagnosis and pregnancy care.

Yes. The calculator also shows key milestones during pregnancy, helping you understand important stages of fetal development.

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