Calculate How Big Is My Baby
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Reviewed by Calculator Editorial Team
Determine your baby's size using our baby size calculator. Learn about fetal growth, ultrasound measurements, and what your measurements mean.
How to Use This Calculator
This calculator helps you estimate your baby's size based on ultrasound measurements. Simply enter the relevant measurements and click "Calculate" to see your baby's estimated size.
For most accurate results, use measurements from a professional ultrasound performed by a healthcare provider.
Steps to Use the Calculator
- Enter the baby's head circumference in centimeters
- Enter the baby's abdominal circumference in centimeters
- Enter the baby's femur length in centimeters
- Select the baby's estimated gestational age
- Click "Calculate" to see the results
The calculator uses standard fetal growth charts and formulas to estimate the baby's size based on the entered measurements.
What Measurements to Use
For the most accurate results, use measurements from a professional ultrasound. Common measurements include:
- Head circumference (HC)
- Abdominal circumference (AC)
- Femur length (FL)
- Biparietal diameter (BPD)
- Humerus length (HL)
Measurements should be taken in centimeters and recorded during the same ultrasound session for best results.
Example Measurements
For a baby at 20 weeks gestation, typical measurements might be:
- Head circumference: 2.8 cm
- Abdominal circumference: 5.2 cm
- Femur length: 1.8 cm
How to Interpret Results
The calculator provides an estimated size category for your baby based on the entered measurements. Common size categories include:
- Small for gestational age (SGA)
- Appropriate for gestational age (AGA)
- Large for gestational age (LGA)
Remember that fetal growth varies naturally, and these estimates are based on average measurements.
What to Do with the Results
If your baby's size falls outside the normal range, discuss the results with your healthcare provider. They can help determine if further monitoring is needed.
Frequently Asked Questions
How accurate is this baby size calculator?
This calculator provides estimates based on standard fetal growth charts. For precise measurements, consult your healthcare provider.
What measurements should I use?
Use measurements from a professional ultrasound, including head circumference, abdominal circumference, and femur length.
What does "small for gestational age" mean?
This means your baby's size is smaller than expected for their current gestational age, which may require additional monitoring.
Can I use this calculator for twins or multiples?
This calculator is designed for single pregnancies. For multiple pregnancies, consult your healthcare provider for specialized measurements.