The Royal College of Obstetricians and Gynaecologists (RCOG) recommends that a fetal abdominal circumference (AC) or estimated fetal weight (EFW) less than 10th centile can be used to diagnose a small for gestational age (SGA) fetus.

Our fetal weight percentile calculator computes your child's growth and compares it to the general population. Our BPD, HC, AC, and FL calculator uses all the necessary ultrasound fetal measurements to compute your child's weight at a given week of the pregnancy.

Mar 3, 2020 · This calculator uses data from the NICHD Fetal Growth Study to calculate Estimated Fetal Weight (EFW) for a singleton (one) fetus between 10 weeks 0 days and 41 weeks 6 days of pregnancy. Depending on the ultrasound measurements included, the calculator can provide four estimates of EFW percentiles.

Apr 5, 2023 · Press the corresponding button to calculate the percentile and its position in the graph. If you already have entered the individual head circumference, abdominal circumference and femur length, press the button of EFW to calculate the estimated fetal weight, the corresponding percentile and its graphical representation.

Apr 20, 2007 · From the polynomial models of the mean and SD of EFW, it was possible to calculate the required centiles for any given gestational age (GA) by using the formula:

Feb 22, 2020 · Establishing an estimated fetal weight (EFW) percentile involves two distinct steps: first, calculating the EFW based on one or more fetal biometric variables (such as head circumference (HC), abdominal circumference (AC) and femur length (FL)); and, second, plotting the EFW against the gestational age (GA) on an EFW standard, to derive a ...

By applying these measurements in specific formulas, healthcare providers can assess the estimated fetal weight (EFW) and track how a baby grows throughout pregnancy. Why Is Hadlock Measurement Important? Hadlock measurements play a …

Feb 4, 2025 · For example, an EFW at the 50th percentile means that the estimated weight is right in the middle of the range for that gestational age. An EFW below the 10th percentile may be considered small for gestational age, while an EFW above the 90th percentile may be considered large for gestational age.

Equations for parameters and computation of Z-scores and centiles for EFW according to GA

Enter the gestational age in weeks and fetal measurements in mm to calculate percentiles. This estimated fetal weight calculator will calculate percentiles as well as the estimated fetal weights based ultrasound data and on many published formulas.*