Baby Eye Color Calculator
Predict baby eye color probabilities from parent eye colors using a 3-allele Mendelian model.
Predicting Baby Eye Color
This calculator estimates the probability of brown, green, or blue eyes using a simplified three-allele Mendelian model (B > G > b). Real eye color involves many genes, so treat results as approximations. For related tools, see the APGAR Score Calculator and Adjusted Age Calculator.
Default Genotype Assumptions
Brown-eyed parents are assumed to be heterozygous: 50% Bb and 50% BG. Green-eyed parents are assumed to be Gb. Blue-eyed parents are homozygous bb. Advanced settings let you change these assumptions for each parent.
Understanding the Results
Two brown-eyed parents most often produce a brown-eyed child (about 75% in the default model), but green and blue outcomes remain possible. Brown and blue parents each contribute a 50% chance of brown eyes in the default model. Actual newborn eye color may change during the first year of life.
Frequently Asked Questions
Can two brown-eyed parents have a blue-eyed baby?
Yes. If both parents carry recessive blue alleles, a blue-eyed child is possible. Under the default model, two brown-eyed parents have about a 6% chance of a blue-eyed baby.
Why are these results only approximations?
Eye color is influenced by more than a dozen genes and environmental factors. This tool uses a simplified three-allele model for educational purposes.
What do the advanced genotype settings do?
They let you specify whether a brown-eyed parent is Bb, BG, or the default mixed heterozygous assumption, and whether a green-eyed parent is Gb or GG.
When do babies' eyes change color?
Many babies are born with lighter eyes that darken over the first 6–12 months as melanin develops. Final eye color may not be apparent until after infancy.
What does B > G > b mean?
Brown (B) is dominant over green (G), and green is dominant over blue (b). A child with any B allele typically has brown eyes; with G but no B, green; with only b alleles, blue.
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