Gestational Age Calculator
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
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
Assumes conception occurred 5 days prior to transfer.
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.