Fetal Growth Comparison Calculator

Enter Ultrasound Measurements

Gestational Age *

e.g., 20 weeks

e.g., 3 days

💡 Measurement Guide: Enter the values measured during your ultrasound examination. You don't need to enter all values; you can enter only the measured items.

BPD (Biparietal Diameter) - Head Width

Diameter of the widest part of the fetal head

HC (Head Circumference) - Head Circumference

Circumference of the fetal head

AC (Abdominal Circumference) - Abdominal Circumference

Circumference of the fetal abdomen

FL (Femur Length) - Femur Length

Length of the fetal femur

EFW (Estimated Fetal Weight) - Estimated Weight (Optional)

Estimated fetal weight calculated from ultrasound

What is the Fetal Growth Comparison Calculator?

The Fetal Growth Comparison Calculator is a tool that compares fetal body measurements from ultrasound examinations with standard growth curves to check if the fetus is growing normally.

📌 Key Measurement Items

• BPD (Biparietal Diameter): Head width - widest part from left to right
• HC (Head Circumference): Head circumference - total head circumference
• AC (Abdominal Circumference): Abdominal circumference - belly circumference
• FL (Femur Length): Femur length - length of the thigh bone
• EFW (Estimated Fetal Weight): Estimated weight - calculated fetal weight

🏥 Examination Timing

Fetal growth measurements are typically performed regularly during the 2nd trimester (14-27 weeks) and 3rd trimester (28-40 weeks). The detailed ultrasound examination at 20-24 weeks is particularly important.

⚠️ Note: This calculator is for reference only. For accurate fetal growth assessment, please consult with an obstetrician. Even if measurements are outside the standard range, individual differences may exist, so a comprehensive evaluation by a specialist is necessary.

Importance of Fetal Ultrasound Measurements

Values such as head circumference (HC), abdominal circumference (AC), and femur length (FL) measured during prenatal ultrasound examinations are compared with standard growth curves by pregnancy week to evaluate fetal development status. Early detection of growth delay or excessive growth allows for appropriate management.

Key Ultrasound Measurement Indicators

CRL (Crown-Rump Length): Fetal length in early pregnancy (6-13 weeks), determines pregnancy week

BPD (Biparietal Diameter): Distance between both ends of the skull

HC (Head Circumference): Head circumference, evaluates brain development

AC (Abdominal Circumference): Belly circumference, reflects nutritional status

FL (Femur Length): Thigh bone length, limb development

EFW (Estimated Fetal Weight): Estimated weight calculated from the above measurements

Signs of Fetal Growth Abnormalities

If measurements are below the 10th percentile, fetal growth restriction (IUGR) is suspected; if above the 90th percentile, macrosomia is suspected. Growth restriction may be caused by placental insufficiency, preeclampsia, infection, etc., while macrosomia may be related to gestational diabetes. If abnormalities are found, additional examinations and close observation are necessary.

Ultrasound Examinations by Pregnancy Week

6-8 weeks: First ultrasound to confirm heartbeat, 11-13 weeks: Birth defect screening (NT measurement), 20-24 weeks: Detailed ultrasound to check structural abnormalities, After 28 weeks: Evaluate fetal growth and amniotic fluid volume. Additional ultrasounds may be performed as needed to continuously monitor fetal status.

Fetal Growth Comparison Calculator

Enter Ultrasound Measurements

Fetal Growth Assessment

📏 Measurement Comparison

💡 Growth Assessment

📖 Current Week Information