Baby Eye Color Prediction Calculator
The Baby Eye Color Prediction Calculator estimates the probability distribution of a baby’s eye color based on parental genetics. This tool helps expecting parents understand inheritance patterns using a simplified Mendelian model. Whether you are curious about how dominant traits work or predicting if light eyes might appear, this tool offers a fun and educational glimpse into genetics.
How Eye Color Is Calculated
This calculator uses a simplified Mendelian genetics model with a two-allele system to estimate probabilities.
P(eye color) = Σ P(genotype producing that color)
Allele Hierarchy:
- B (Brown): Dominant over all
- G (Green/Hazel): Dominant over blue, recessive to brown
- b (Blue): Recessive
We assume each parent carries potential genotypes consistent with their eye color (e.g., a brown-eyed parent might be BB, Bb, or BG). The tool calculates every possible combination of these parental genotypes to determine the probability of the child inheriting specific phenotypes. If a family history of light eyes is present, we statistically weight the results slightly toward lighter colors before normalizing the final percentages.
What Your Results Mean
High Brown Probability
If your result shows a 75% or higher chance for brown eyes, it indicates that at least one parent likely carries two dominant alleles. Brown is the most common dominant trait globally, meaning it often masks other colors in the genotype.
Mixed Probabilities
If you see a near-even split (e.g., 50% Brown, 50% Blue), it usually means one parent has brown eyes carrying a recessive gene (Bb) and the other has blue eyes (bb). This scenario often results in a "toss-up" where the child could inherit either trait.
Important Note on Genetics
Real-world eye color is polygenic, involving up to 16 different genes. While this tool offers a solid statistical estimate based on classical Mendelian inheritance, actual outcomes can vary significantly from these predictions.
Disclaimer: This result is an estimate for informational and educational purposes only. Actual eye color is determined by complex polygenic interactions and may change during infancy. Consult a genetic counselor for specific medical advice.
Calculation logic verified using publicly available standards.
View our Accuracy & Reliability Framework →