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Crown-Rump Length Calculator — Free Online Tool
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Crown-Rump Length Calculator

Estimate gestational age and due date from fetal Crown-Rump Length (CRL)

Ultrasound Dating Guidelines: Crown-Rump Length (CRL) measured during early first-trimester ultrasound (typically 6 to 13 weeks) is the most accurate method for establishing gestational age. Enter the ultrasound scan date and measured CRL below.
Ultrasound Measurement Input

Calculation Results

⚠️ Not medical advice. For obstetric ultrasound reference only. Fetal measurements and dating must be interpreted and confirmed by a qualified sonographer or obstetrician.

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