Fetal Weight Calculator
Estimate fetal weight (EFW) from ultrasound biometry measurements using Hadlock and Shepard formulas.
Important Health Disclaimer
This calculator provides general health information based on standard medical formulas and WHO guidelines. Results are for informational and educational purposes only and should not be considered as professional medical advice, diagnosis, or treatment recommendations.
For health concerns, medical conditions, fitness plans, or dietary decisions, please consult with qualified healthcare professionals, licensed physicians, registered dietitians, or certified fitness trainers who can evaluate your individual health status and medical history.
Individual health needs vary significantly. These calculations are general estimates and may not be appropriate for everyone, especially those with existing medical conditions, pregnant women, children, or elderly individuals.
Not a substitute for professional medical advice
Gestational Age
Ultrasound Measurements
Head width measurement
Head circumference
Belly circumference
Thigh bone length
Estimated Fetal Weight
0 g
0 lbs 0.0 oz
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
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