Crown-Rump Length Calculator
Estimate gestational age and due date from ultrasound measurements
Note: Crown-rump length (CRL) is most accurate for dating pregnancies between 6-14 weeks gestation.
Results should be interpreted by qualified healthcare professionals.
Gestational Age (CRL-based)
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Estimated Due Date
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Gestational Age Range
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LMP-Based Gestational Age
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Date Discrepancy
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Interpretation
Enter CRL measurement and click calculate to see interpretation.
Clinical Note: CRL measurements are most accurate between 6-14 weeks gestation.
After 14 weeks, other measurements (biparietal diameter, head circumference, etc.) are preferred for dating.
Always correlate with clinical findings and patient history.