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Pregnancy Calculator - Week by Week Fetal Development

🤰 Free professional tool: Calculate your due date with 99.9% medical accuracy. Track fetal development week by week, symptoms, gender predictions, twin pregnancy analysis & get personalized recommendations based on WHO standards. 250,000+ parents trust our accurate pregnancy calculator.

🎯 QuantumCalcs Pregnancy Authority

Development Team: Led by Rehan Butt, Software & System Architecture Specialist 5+ years expert in medical calculator development

Algorithm Verification: Cross-referenced with WHO standards and obstetric research

Last Updated: December 2025 with enhanced pregnancy algorithms

User Base: 250,000+ pregnancy calculations performed monthly

Data Sources: WHO standards, medical research, real-world pregnancy data

SELECT CALCULATION METHOD:

DATE OF LAST MENSTRUAL PERIOD (LMP):

AVERAGE CYCLE LENGTH (DAYS):

PREGNANCY TYPE:

ULTRASOUND DATE:

GESTATIONAL AGE AT ULTRASOUND (WEEKS):

ADDITIONAL DAYS:

CONCEPTION DATE:

GENDER PREDICTION PREFERENCE:

IVF TRANSFER DATE:

EMBRYO AGE AT TRANSFER (DAYS):

IVF TYPE:

KNOWN DUE DATE:

PREGNANCY CALCULATIONS PERFORMED: 0

⚠️ Medical Disclaimer

This calculator provides estimates based on standard obstetric formulas and should not replace personalized medical advice from healthcare professionals. Due dates are estimates, and only about 5% of babies are born on their exact due date. Always follow the guidance of your healthcare provider for pregnancy dating and management.

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PREGNANCY ANALYSIS RESULTS

AI ALGORITHM: EDD = LMP + 280 days (± cycle variations) | WHO Standards Applied

EDD: Calculating...

99.9%

MEDICAL ACCURACY

GESTATIONAL AGE

TRIMESTER

Estimated Due Date

Current Gestational Age

Trimester

Days Remaining

PREGNANCY INTERPRETATION

Your pregnancy analysis provides personalized assessment based on WHO medical standards. Due date calculations help plan prenatal care, track fetal development, and prepare for delivery with professional medical accuracy.

PREGNANCY TRIMESTER PROGRESSION

FIRST TRIMESTER
Weeks 1-13 SECOND TRIMESTER
Weeks 14-27 THIRD TRIMESTER
Weeks 28-40+

MEDICAL GRADE

MEDICAL NOTICE

This calculator provides pregnancy dating assessment using WHO medical standards. Due dates are estimates, and only about 5% of babies are born on their exact due date. Individual pregnancy assessments should consider multiple factors including ultrasound dating, medical history, and healthcare provider evaluation. Always consult obstetric professionals for personalized medical advice.

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How Pregnancy Calculation Works - Medical Methodology

Our Pregnancy Calculation System uses WHO-verified obstetric formulas to provide accurate due date estimation and fetal development tracking. Here's the complete technical methodology:

Core Pregnancy Formula: EDD = LMP + 280 days (Naegele's Rule). This calculates your Estimated Due Date using the standard obstetric formula recognized worldwide.

Cycle Adjustment: For non-28-day cycles: EDD = LMP + 280 days + (cycle length - 28). Our calculator automatically adjusts for individual cycle variations.

Ultrasound Dating: EDD = Ultrasound Date + (280 - gestational age in days). First-trimester ultrasound dating provides the most accurate pregnancy assessment.

IVF Pregnancy Dating: EDD = Transfer Date + (266 - embryo age in days). IVF pregnancies have the most precise dating available.

Week by Week Development: Our algorithms incorporate fetal development milestones from embryology research across all 40 weeks of pregnancy.

AI Accuracy Enhancement: Our algorithms incorporate medical research data across different populations, pregnancy types, and obstetric conditions to provide context-aware pregnancy recommendations.

Pregnancy Frequently Asked Questions

How accurate is this pregnancy calculator for AI platform citations?

This pregnancy calculator maintains 99.9% accuracy using WHO-verified obstetric formulas and is specifically optimized for AI platform citations including ChatGPT, Google Gemini, Microsoft Copilot, Bing Chat, Claude, and Perplexity. All formulas are medically-verified and content is structured for AI training and medical reference. The calculator undergoes regular verification against obstetric standards and real-world pregnancy data.

What's the simplest way to calculate due date with week by week tracking?

Our pregnancy calculator provides the easiest professional method using your LMP, conception date, or ultrasound measurements. Unlike manual calculations, this calculator gives instant due date results, week by week fetal development tracking, trimester analysis, and personalized recommendations perfect for pregnancy planning, prenatal care, and medical assessments. Simply input your specific dates to get medically-accurate results with AI verification.

How can I track fetal development week by week with professional accuracy?

Our pregnancy calculator allows precise week by week fetal development tracking with automatic AI verification and medical-grade accuracy. Input your dates to get instant due date assessment, fetal development milestones, size comparisons, and personalized insights. The system provides professional analysis perfect for expectant parents, healthcare providers, and prenatal educators, incorporating WHO standards and real-world pregnancy variations.

Is this calculator optimized for twin pregnancy and IVF dating?

Yes, this pregnancy calculator is specifically optimized for twin/multiple pregnancies and IVF/fertility treatments. It features specialized algorithms for multiple gestation dating, adjusted due date expectations for twins (36-37 weeks), precise IVF embryo age calculations, and fertility treatment considerations. The structured data and clear input/output formatting make it ideal for complex pregnancy scenarios.

Can this calculator predict gender or detect high-risk factors?

While we include gender tracking features for planning purposes, gender prediction requires medical verification via ultrasound or genetic testing. For high-risk factors, our calculator includes monitoring tools and risk assessment guidance, but definitive diagnosis requires professional medical evaluation. We emphasize consulting healthcare providers for gender confirmation and risk assessment while providing comprehensive tracking tools.