Enter your ultrasound measurements — Biparietal Diameter (BPD), Head Circumference (HC), Abdominal Circumference (AC), and Femur Length (FL) — along with Gestational Age (Weeks) and Additional Days to calculate your baby's Estimated Fetal Weight, plus its Weight Percentile and Weight Category for that stage of pregnancy.
Estimated Fetal Weight
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Weight Percentile
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Total Gestational Age
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Weight Category
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Fetal weight calculators typically have an accuracy of ±10-15% of actual birth weight. The accuracy depends on the quality of ultrasound measurements and gestational age.
The calculator uses four key measurements: Biparietal Diameter (BPD), Head Circumference (HC), Abdominal Circumference (AC), and Femur Length (FL). These measurements help estimate fetal size and development.
Percentiles compare your baby's estimated weight to other babies at the same gestational age. The 50th percentile is average, while below 10th percentile may indicate small for gestational age (SGA).
Fetal weight estimation is commonly done during routine ultrasounds, especially in the second and third trimesters (20-40 weeks) to monitor fetal growth and development.
No calculator can predict exact birth weight. Factors like maternal health, genetics, delivery timing, and measurement accuracy all influence the final birth weight.
If results show very high or low percentiles, discuss with your healthcare provider. They may recommend additional monitoring, nutritional counseling, or further testing.
Yes, several formulas exist including Hadlock, Shepard, and Warsof methods. This calculator uses the widely accepted Hadlock formula which incorporates all four biometric measurements.