Gestational Age Calculator
Determine gestational age in weeks and days using last menstrual period, conception date, or IVF transfer dates.
Input Parameters
Enter details for calculation.
Gestational Age
Expert Tip
Pregnancy is dated from the first day of the last menstrual period, meaning you are technically 2 weeks pregnant at conception.
Calculation Methodology & Details
Formula
Dating is calculated based on days elapsed since the LMP.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
How Gestational Age is Calculated
Follow these steps to use this calculator:
Enter Period Date
Input days elapsed since your last period started.
Read Weeks
Check current week of pregnancy and trimester.
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ℹ️ About this Calculation
This obstetrics and gynecology calculator provides accurate gestational dating, fetal biometry estimations, risk stratification, and maternal health tracking based on ACOG guidelines and clinical ultrasonography standards.
Variable Glossary
Clinical Parameters
Last menstrual period (LMP), ultrasound biometric measurements (CRL, BPD, AC, FL), or lab hCG levels.
Obstetric Metrics
Estimated due date (EDD), gestational age in weeks/days, fetal growth percentiles, and risk scores.
How to Calculate Step-by-Step
Step 1
Enter your last menstrual period (LMP) date or ultrasound biometry values.
Step 2
Select cycle length parameters or maternal clinical characteristics if required.
Step 3
Review calculated due date timeline, milestone projections, or risk scores immediately.