Fetal Weight Calculator
Estimate fetal weight (EFW) from ultrasound biometry measurements using Hadlock and Shepard formulas.
Gestational Age
Ultrasound Measurements
mm
Head width measurement
mm
Head circumference
mm
Belly circumference
mm
Thigh bone length
Estimated Fetal Weight
0 g
0 lbs 0.0 oz
👶EFW (Primary)
0 g
📅Gestational Age
32.0 weeks
📊Expected 50th %ile
118665 g
📈Average (Hadlock)
0 g
Growth Assessment
Small for gestational age (SGA)
Deviation from expected: -100%
Formula Comparison
Hadlock (BPD,HC,AC,FL): 0 g
Hadlock (BPD,AC,FL): 0 g
Hadlock (HC,AC,FL): 0 g
Hadlock (AC,FL): 0 g
Shepard (BPD,AC): 0 g
Accuracy Note
±15% is typical for ultrasound EFW. Actual birth weight may vary.
About Fetal Weight Estimation
Measurements
- BPD: Biparietal diameter (head width)
- HC: Head circumference
- AC: Abdominal circumference
- FL: Femur length
Clinical Notes
- SGA: <10th percentile
- LGA: >90th percentile
- Hadlock is most widely validated
- AC is most predictive of weight