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Gestational Age Calculator

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Gestational Age

Calculate current Gestational Age (GA) and accurate due dates based on advanced clinical parameters including early Ultrasound dating and Assisted Reproductive Technology (IVF).

Dating Method

CANVATOOLS

Obstetrics & Gynecology

Gestational Age Report

Jul 2, 2026, 12:39 AM

ID: GA-445492

Patient Name

Jane Doe

Current Gestational Age

14w3d

US DATING

Estimated Due Date (EDD)

Mon, December 28, 2026

Calculation Baseline

Scan Date6/18/2026
Scan GA12w 3d
TrimesterTRIMESTER 2

First-trimester ultrasound dating (CRL measurement) is considered the most accurate method for establishing estimated due date.

*** End of Report ***

Clinical Precision & Methodology

The Gestational Age Calculator utilizes advanced dating methods—specifically early ultrasound scans and IVF transfer dates—which provide significantly higher clinical accuracy than standard LMP-based rules.

Ultrasound Dating

Calculates current gestational age by projecting forward from a known, clinically measured ultrasound baseline (such as Crown-Rump Length). According to ACOG, a first-trimester scan is the most accurate dating method.

ART & IVF Protocols

Supports precise calculations for Assisted Reproductive Technology, utilizing exact day-3 cleavage or day-5 blastocyst transfer dates rather than relying on assumed follicular phases.

Thermal Receipt Export

Generates a high-resolution, perfectly scaled PNG image designed specifically for 80mm thermal printers, enabling instant clinical handouts.

IVF Calculation Logic

Day-5 Blastocyst TransferEDD = Transfer Date + 261 Days

Assumes conception occurred 5 days prior to transfer.

Day-3 Cleavage TransferEDD = Transfer Date + 263 Days

Assumes conception occurred 3 days prior to transfer.

How Gestational Age Works

Our high-performance online utility runs entirely client-side, processing your files securely and instantly inside your web browser. For related functions, you can also use our Due Date and All Medical Tools utilities.

Enter LMP Date

Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.

Or Ultrasound Date

Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.

Get Current Age

Step-by-step interactive processing designed for simple, fast, and high-fidelity execution.

Clinical Dating Methods

Designed for professional results, privacy, and maximum compatibility across all modern desktop and mobile browsers:

IVF Transfer

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Ultrasound Dating

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Due Date

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Trimester Tracking

Full digital precision and optimized performance with zero server-side latency or external data transfers.

Frequently Asked Questions About Gestational Age

Is this gestational age calculator free?

Which dating methods are supported?

Is it clinically accurate?

Do you store pregnancy data here?