Baby Eye Color Predictor
Predict the probability of your baby's eye color based on both parents' eye colors using Mendelian genetics.
Probabilities are based on simplified Mendelian genetics and are estimates only. Actual eye color is influenced by multiple genes and can differ from predictions.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
Can't find what you need?
Request a ToolHow to Use the Baby Eye Color Predictor
This tool uses simplified Mendelian genetics to estimate the probability that your baby will have brown, green, or blue eyes. Here is how it works:
- Select Parent 1's eye color. Choose brown, green/hazel, or blue from the dropdown.
- Select Parent 2's eye color. Choose the second parent's eye color.
- Read the probabilities. The result shows a percentage chance for each eye color, a bar chart visualization, and the most likely outcome.
Remember that these are probabilities, not guarantees. Eye color genetics is complex and involves many genes, not just the simplified dominant/recessive model used here. The most common deviation from predictions is when two blue-eyed parents have a brown-eyed child, which can happen due to genetic variation not captured in simple models.
About Eye Color Genetics
Eye color is primarily determined by the amount of melanin in the iris, controlled by several genes. The two most important are OCA2 and HERC2, located on chromosome 15. Brown is generally dominant over blue, meaning a person only needs one copy of the brown-producing allele to have brown eyes. Blue requires two copies of the recessive allele. Green/hazel falls in between and results from moderate melanin levels and light scattering effects.
This calculator uses a simplified two-gene model, which is sufficient for most predictions but does not capture rare outcomes. All babies are born with little melanin in their irises, so eye color at birth is not final. Most babies' eyes reach their permanent color by 6-9 months, though some continue to change until age 3.
Frequently Asked Questions
Can two blue-eyed parents have a brown-eyed baby?
It is very unlikely but possible. The simplified Mendelian model predicts about 99% blue and 1% green for two blue-eyed parents. However, real genetics is more complex. Multiple genes control eye color, and rare mutations or unexpected allele combinations can produce different outcomes. If paternity is not in question, a brown-eyed child from two blue-eyed parents is an unusual but documented genetic occurrence.
When do babies' eyes change color?
Most babies are born with blue or gray eyes because melanin has not yet fully developed in the iris. Eye color typically begins to change and stabilize between 6 and 9 months of age. However, some babies continue to see changes in eye color until 3 years old. Eyes that are still blue at 6-9 months have a good chance of staying blue, while eyes that appear darker or begin to show brown flecks are likely transitioning to their final color.
What is the most common baby eye color?
Brown is the most common eye color worldwide, accounting for approximately 55-79% of the global population. Blue eyes are most common in people of Northern and Eastern European descent. Green eyes are the rarest eye color globally, found in about 2-3% of the world population. The prevalence of each eye color in a baby depends heavily on the parents' ethnic backgrounds and genetic makeup.
Is eye color prediction accurate?
Simple Mendelian-based predictions are reasonably accurate for the most probable outcomes but miss edge cases. DNA-based eye color prediction tests (which analyze multiple genetic markers) can be up to 90% accurate. This calculator uses a simplified model based on two parent eye colors and is best used to understand the range of likely outcomes, not as a definitive prediction. Consider it an informed estimate rather than a certainty.