Fetal Weight Calculator
Estimate your baby's weight using ultrasound measurements
Estimated Fetal Weight (g) = 0.23718 × AC² × FL + 0.03312 × AC × FL²
Example: AC=30cm, BPD=9cm, FL=7cm. Weight ≈ 3500g (7.7 lbs)
How accurate is fetal weight estimation?
Ultrasound estimates are typically within 10-15% of actual birth weight, though accuracy can vary.
What measurements are used?
Common measurements include abdominal circumference (AC), biparietal diameter (BPD), femur length (FL), and head circumference (HC).
When is fetal weight measured?
Typically during routine ultrasounds in the second and third trimesters to monitor fetal growth.
🔗 Related Calculators
📐 Formula
Estimated Fetal Weight (g) = 0.23718 × AC² × FL + 0.03312 × AC × FL²
📝 Example Calculation
Example: AC=30cm, BPD=9cm, FL=7cm. Weight ≈ 3500g (7.7 lbs)
❓ Frequently Asked Questions
How accurate is fetal weight estimation?▼
Ultrasound estimates are typically within 10-15% of actual birth weight, though accuracy can vary.
What measurements are used?▼
Common measurements include abdominal circumference (AC), biparietal diameter (BPD), femur length (FL), and head circumference (HC).
When is fetal weight measured?▼
Typically during routine ultrasounds in the second and third trimesters to monitor fetal growth.