Fetal length Calculator

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Femur length  mm
 Predicted Fetal length cm
 Predicted Fetal length  inches

Fetal length in centimeters = 6.18 + 0.59 x femur length in millimeters.


Vintzileos AM, Campbell, et al. The ultrasound femur length as a predictor of fetal length.
Obstet Gynecol. 1984 Dec;64(6):779-82. PMID: 6390277

All calculations must be confirmed before use. The suggested results are not a substitute for clinical judgment. Neither nor any other party involved in the preparation or publication of this site shall be liable for any special, consequential, or exemplary

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