Evaluate fetal growth by comparing estimated weight (EFW) to gestational norms.
Biometry Data
Growth Assessment
Fetal Percentile0.0th
Mean Weight11563593g
Potential Fetal Growth Restriction (FGR)
Growth Analysis
Threshold Reference
< 10thSmall (SGA/FGR)
10th - 90thAppropriate Growth
> 90thLarge (LGA)
About this calculator
Overview
Fetal Weight Percentile tracks how a baby's weight in the womb compares to other babies at the same stage of pregnancy. It is usually based on calculations from ultrasound biometry (head circumference, abdominal circumference, and femur length) and is a key indicator of fetal health and placental function.
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Pro Tips
Ultrasound estimation of fetal weight has an error margin of approximately +/- 15%.
Consistency in measurements over time (the growth 'trend') is more important than a single one-off reading.
Parental size and ethnicity are important considerations when interpreting 'small' or 'large' babies.
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Fun Facts
"A percentile between 10th and 90th is generally considered normal."
"Below the 10th percentile may indicate Small for Gestational Age (SGA) or Fetal Growth Restriction (FGR)."
"Above the 90th percentile suggests Large for Gestational Age (LGA) or Macrosomia."
"The abdominal circumference (AC) is often the most sensitive individual parameter for predicting growth restriction."
Formula: Standard fetal growth curves (e.g., Hadlock, WHO, or INTERGROWTH-21st).
