Biometry calculators for a given gestational age and to estimate fetal weight from biometric measurements.

Calculators are in the process of being redeveloped by ISUOG's developers and we will notify members when these are back online. 

Our calculators can be used to date pregnancies, convert biometric data to centiles and Z-scores for a given gestational age and to estimate fetal weight from biometric measurements. Please bear with us whilst we make improvements for our members. 

Please note: the formulas for our calculators are derived from studies published in peer review journals listed in index medicus. The final diagnosis is however the sole responsibility of the operators performing the examinations and ISUOG accepts no liability from the use of these calculators.

Formulae modified from:

Snijders and Nicolaides, UOG 1994
 

Snijders and Nicolaides


Chitty and Altman, BJOG 2002
 

Chitty and Altman

 

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