Is the Gestational Age Calculator free to use?

Yes. The Gestational Age Calculator on LoanPay Logic is completely free, runs entirely in your browser, and requires no sign-up or personal information.

What does the Gestational Age Calculator calculate?

The Gestational Age Calculator takes pregnancy due date and milestone calculator gestational age elite as inputs and returns accurate results instantly. Every calculation runs locally so your data never leaves the page.

Can I use the Gestational Age Calculator on my phone?

Yes. The LoanPay Logic Gestational Age Calculator is fully responsive and works on desktop, tablet, and mobile browsers with the same accuracy.

Is this tool medical advice?

No. Results are estimates for general awareness and should not replace professional medical guidance.

How accurate are the results?

The calculations use widely accepted standard formulas and are accurate to the precision shown.

How does the LMP dating method work?

The calculator corrects the LMP by cycle length if needed, then adds 280 days to estimate the due date.

When should ultrasound replace LMP dating?

Use ACOG discrepancy thresholds: small first-trimester differences can matter, while later pregnancy requires larger differences to change the estimated due date.

How is IVF due date calculated?

The due date is calculated from transfer date and embryo age using standard IVF/ART dating conventions.

LoanPay Logic

Pregnancy Due Date & Milestone Calculator

Home Tools CenterPregnancy Due Date & Milestone Calculator

Elite pregnancy tool

Pregnancy dating, milestone tracking, and ACOG-style calibration in one elegant page.

Use LMP, ultrasound, known EDD, IVF/ART, or conception date inputs to estimate the due date, gestational age, and estimated conception date with premium medical-grade presentation.

Method

LMP

Today

October 1, 2026

Status

Ready to calculate

Real imagery

Authentic medical and maternal imagery pulled from unsplash image URLs.

Calculator controls

Choose your dating method

LMP first dayCycle length

ACOG discrepancy thresholds

Ultrasound timing	Re-date if off by
Single CRL ultrasound before 9 weeks	≥ 5 days
Single CRL ultrasound 9w0d to 13w6d	≥ 7 days
Second-trimester ultrasound 14w0d to 21w6d	≥ 10 days
Second-trimester ultrasound 22w0d to 27w6d	≥ 14 days
Third-trimester ultrasound 28w0d and later	≥ 21 days

Results

Estimated due date, gestational age, and conception date

Ready for calculation

Enter the values above and click Calculate to reveal your due date, gestational age, and conception estimate.

Important dates & windows

Timeline of pregnancy milestones

6 weeks

Early ultrasound may confirm a gestational sac and embryo development.

10 weeks

NIPT and first-trimester screening commonly become available.

14 weeks

Second trimester begins; energy often improves.

20 weeks

Anatomy ultrasound is usually scheduled around this window.

28 weeks

Third trimester starts; glucose screening and Rh checks are commonly reviewed.

40 weeks

Estimated due date reached, though delivery commonly occurs before or after.

How calibration works

Perinatology-style decision logic

LMP dating uses corrected LMP = LMP + (cycle length − 28), then EDD = corrected LMP + 280 days.

Ultrasound dating can override LMP when the discrepancy exceeds accepted thresholds by gestational age.

IVF/ART uses transfer date and embryo age to estimate due date precisely.

Conception dating adds 266 days from the estimated conception day.

ACOG calibration table

When to re-date the pregnancy

Ultrasound window	Threshold for changing EDD
Single CRL ultrasound before 9 weeks	≥ 5 days
Single CRL ultrasound 9w0d to 13w6d	≥ 7 days
Second-trimester ultrasound 14w0d to 21w6d	≥ 10 days
Second-trimester ultrasound 22w0d to 27w6d	≥ 14 days
Third-trimester ultrasound 28w0d and later	≥ 21 days

These thresholds are presented as a practical clinical reference and are aligned with widely used ACOG-style dating principles.

Navigation

Continue to other pages and tools

This page keeps internal linking active so users can jump back to the home page or browse the tools center seamlessly.

Back to Home Tools Center Another Pregnancy Tool

About the Gestational Age Calculator

Gestational Age Calculator is a free, browser-based health & lifestyle tool that gives you accurate pregnancy due date and milestone calculator gestational age elite results in seconds — with no account and no data uploaded to any server.

This particular page focuses on the elite workflow of pregnancy due date and milestone calculator gestational age elite; use it alongside the related tools below to cover adjacent scenarios without switching sites.

Every input you enter is processed locally, so results appear instantly and your figures stay private. Preset examples give you a fast starting point, and the output updates live as you refine your numbers.

Last updated September 2026 · Reviewed by the LoanPay Logic editorial team

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Pregnancy dating, milestone tracking, and ACOG-style calibration in one elegant page.

About the Gestational Age Calculator

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