Fetal Weight Calculator (Hadlock Formula)

Calculate estimated fetal weight (EFW) using the Hadlock formula (BPD, HC, AC, FL). Monitor fetal growth during pregnancy.

Fetal Biometry & EFW (Hadlock)

Medical Disclaimer

This tool is for educational and screening purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

Biparietal Diameter (BPD) (mm)

Head Circumference (HC) (mm)

Abdominal Circumference (AC) (mm)

Femur Length (FL) (mm)

Hadlock Formula: This is the most widely used formula in obstetric ultrasound to estimate fetal weight using four basic biometric measurements.

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About Estimated Fetal Weight (Hadlock)

The Estimated Fetal Weight (Hadlock) tool provides a crucial calculation for assessing fetal growth during pregnancy. Utilizing established biometric parameters—Biparietal Diameter (BPD), Head Circumference (HC), Abdominal Circumference (AC), and Femur Length (FL)—this tool applies the Hadlock formula to accurately estimate fetal weight. It is indispensable for obstetricians, sonographers, and other healthcare professionals to monitor fetal development, identify potential growth restrictions (IUGR) or macrosomia, and guide appropriate clinical management. By offering a standardized and reliable method, it aids in timely interventions and supports informed decision-making for maternal and fetal well-being.