Fetal Weight Percentile Calculator
Fetal Weight Percentile
Determine the estimated fetal weight percentile based on ultrasound measurements and gestational age
weeks
grams
Formula
Percentile = Z-Score based on (Estimated Weight - Median Weight) / Standard Deviation
Frequently Asked Questions
What fetal weight percentile is considered normal?
Fetal weights between the 10th and 90th percentile are generally considered appropriate for gestational age. Weights below the 10th percentile may indicate growth restriction.
How accurate are ultrasound weight estimates?
Ultrasound estimates of fetal weight have a margin of error of about 10 to 15 percent. The accuracy can vary based on fetal position and gestational age.