Baby Eye Color Calculator
Estimate the likelihood of your baby's eye color by choosing the parents' eye colors. Calculations are based on simplified genetic models.
Results
Total probability accounted for: 100%
Brown — 50%
Brown dominates if passed
Blue — 50%
Equal chance if brown allele absent
How to Use This Calculator
Select both parents' eye colors
Choose the color that best represents each parent (or biological donor).
Review estimated probabilities
See which eye colors are most likely, along with explanations.
Understand variability
Keep in mind that genetic variation can lead to outcomes outside these estimates.
Formula
The calculator applies simplified Mendelian inheritance with adjustments for polygenic influence:
Actual eye color is determined by multiple genes (OCA2, HERC2, SLC genes, etc.). The percentages offer educational estimates, not guarantees.
About Baby Eye Color Genetics
Eye color is polygenic, meaning many genes contribute to the final phenotype. Melanin concentration in the iris stroma and epithelium drives visible color.
Babies commonly have lighter eyes at birth due to minimal melanin; pigment may darken over the first 12–24 months. Blue or gray eyes can shift to green or brown as melanin increases.
Factors influencing eye color
- Genetics: Combined alleles from both parents determine melanin production.
- Gene modifiers: Additional genes subtly adjust hue (hazel, gray).
- Ethnicity and ancestry: Populations have different allele frequencies, affecting probabilities.
Frequently Asked Questions
Can babies' eye color change?
Yes. Many infants start with blue/gray eyes that darken as melanin develops during the first two years.
Do grandparents' eye colors matter?
They can, because recessive genes may skip generations. Our simplified model uses parents only for clarity.
What about hazel or gray eyes?
Hazel eyes combine brown and green pigment. Gray eyes are rare variants of blue or green; we approximate them within the blue/green outcomes.
Are these predictions accurate?
They are educational estimates. Real genetics are more complex, so actual outcomes can differ, especially in diverse ancestries.
Do eye color genes affect health?
Eye color itself doesn't determine health. However, certain genetic syndromes involve pigmentation genes. Consult a healthcare provider for concerns.