Crown-rump Length Calculator
Estimate gestational age and fetal growth milestones based on ultrasound Crown-Rump Length (CRL) measurements.
Input Parameters
Enter details for calculation.
Gestational Age
Expert Tip
CRL is the most accurate ultrasound method for dating a pregnancy in the first trimester (up to 14 weeks).
Calculation Methodology & Details
Formula
Uses the Robinson/Fleming formula commonly integrated into prenatal ultrasound machines.
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 CRL is Calculated
Follow these steps to use this calculator:
Input CRL
Enter the length in millimeters from the ultrasound report.
Read Gestational Age
Check estimated weeks of pregnancy.
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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.