The length of the fetus from the crown (top of the head) to the bottom of the buttocks (the area above where legs begin) is called as Crown Rump Length (CRL). It is measured from 6 – 13 weeks of pregnancy. In this online CRL calculator, you can find the crown rump length for the number of weeks.

Calculator of Crown Rump Length

Number of Weeks
Crown Rump Length

Typical CRL will be around 0.4cm for 6.1 Weeks, 1cm for 7.2 Weeks, and grow up to 8.0 cm at 14.0 weeks. The measurement is done using ultrasound scan.


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