Fetal Weight Percentile Calculator

Your details

Completed gestational weeks, as reported on your ultrasound (14-40 weeks).
weeks
The width of the fetal skull at the widest point, measured on ultrasound.
cm
The circumference of the fetal head, measured on ultrasound.
cm
The circumference of the fetal abdomen, measured on ultrasound. Most sensitive to growth restriction.
cm
The length of the fetal thigh bone, measured on ultrasound.
cm
Growth percentileAppropriate for gestational age (AGA)
54.5%ile

Where this estimated weight falls on the Hadlock reference curve for the gestational age

Estimated fetal weight1,981g
Weight in selected units1981 g
10th percentile for this week1,659g
50th percentile for this week1,953g
90th percentile for this week2,298g
Z-score0.11
54.5 %ile57.1% below · Percentile

54.5th percentile at 32 weeks gestation.

  • At 32 weeks, the typical (50th percentile) fetal weight is about 1953 g; the 10th-to-90th range is 1659-2298 g.
  • This estimated weight of 1981 g is appropriate for gestational age (between the 10th and 90th percentiles).
  • Growth appears within the expected range for this gestational age.
  • The z-score of 0.11 means the EFW is 0.11 standard deviations above the median for 32 weeks.
  • EFW carries an inherent measurement uncertainty of roughly +/-10-15%: a single scan is a snapshot, not a precise weight.

Next stepDiscuss these measurements with your obstetrician or midwife. A trend across multiple scans is far more informative than any single reading.

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