Free Baby Gender Prediction by Bpd Calculator

This free baby gender prediction calculator uses BPD (biparietal diameter) measurements to estimate the likelihood of your baby's sex. While not 100% accurate, BPD is one of the most reliable early indicators of fetal sex.

How the BPD Gender Prediction Works

The biparietal diameter (BPD) is the distance between the two sides of the fetal skull. Research shows that BPD measurements taken between 11 and 14 weeks of pregnancy can provide a reasonable estimate of fetal sex.

Gender Prediction Formula: - BPD < 55mm: Likely female - BPD 55-65mm: Indeterminate - BPD > 65mm: Likely male

The exact cutoffs may vary slightly between studies, but this general range is widely accepted in medical literature. The prediction becomes more accurate as the pregnancy progresses.

Why BPD is Used for Gender Prediction

Several factors contribute to BPD's usefulness for sex prediction:

BPD is one of the first measurable fetal parameters
It's relatively easy to measure with ultrasound
Research shows it correlates with fetal sex with about 85-90% accuracy
It's available before other more definitive methods like amniocentesis

Note: While BPD is useful, it should not be considered definitive. Other factors like genetic testing or chromosomal analysis provide more accurate results.

How to Use This Calculator

Using our free baby gender prediction calculator is simple:

Enter the biparietal diameter measurement in millimeters
Click "Calculate" to see the estimated gender probability
Review the interpretation of your results
Optionally view the chart visualization

Example Calculation

If you measure a BPD of 60mm:

The calculator will show "Indeterminate" as the result
This means the measurement falls in the middle range where sex prediction is less certain
You might want to wait for a more definitive test or get a second opinion

BPD Measurement Ranges and Probabilities
BPD Range (mm)	Estimated Probability	Interpretation
< 55	85% Female	Likely female
55-65	Indeterminate	More testing recommended
> 65	85% Male	Likely male

Interpreting the Results

When you get your gender prediction results, consider these factors:

Results are most accurate between 11-14 weeks of pregnancy
Indeterminate results suggest you should wait for more definitive tests
Remember that BPD is just one piece of information
Consult with your healthcare provider for personalized advice

What to Do with Your Results

Based on your results, you might want to:

If results are clear: Prepare for a baby of the predicted sex
If results are indeterminate: Schedule a follow-up ultrasound or genetic testing
In all cases: Keep open communication with your healthcare provider

Limitations of BPD Prediction

While BPD is useful, it has several limitations:

Accuracy decreases as pregnancy progresses
Can be affected by fetal position
Not as precise as genetic testing
Should be used as one piece of information, not the only factor

Important: This calculator provides estimates only. For definitive sex determination, consult with your healthcare provider and consider more accurate tests like amniocentesis or NIPT.

FAQ

How accurate is BPD for gender prediction?

BPD is about 85-90% accurate for gender prediction, especially between 11-14 weeks of pregnancy. The accuracy decreases as the pregnancy progresses.

When should I use this calculator?

This calculator is most useful between 11-14 weeks of pregnancy when BPD measurements are most reliable. After this period, other tests may be more accurate.

What if my results are indeterminate?

If your results fall in the indeterminate range (55-65mm), you should schedule a follow-up ultrasound or consider more definitive tests like amniocentesis.

Can BPD predict other fetal characteristics?

BPD is primarily used for gender prediction, but it can also provide some information about fetal growth and development.