Pick each parent's eye color to instantly see the probability your baby will have brown, green, hazel, or blue eyes — plus the full genetics chart and answers to the most common inheritance questions.
Mother's eye color
Father's eye color
Most likely: Brown (50%)
Eye color is controlled by several genes, the main ones being OCA2 and HERC2 on chromosome 15. HERC2 acts as a switch that regulates how much pigment OCA2 produces in the iris. High melanin gives brown eyes, medium melanin plus light scattering gives green or hazel, and very low melanin gives blue.
Brown is generally dominant over green, and green is dominant over blue — but because at least a dozen genes contribute to iris pigment, real-world outcomes are probabilities, not guarantees. Two brown-eyed parents can absolutely have a blue-eyed baby, and two blue-eyed parents can occasionally produce a brown-eyed one.
For a deeper walkthrough of the biology behind the pigment, read Baby Eye Color Genetics Explained.
This chart summarizes the estimated probability distribution for every parent combination our calculator supports. Percentages are rounded and reflect population averages, not an individual guarantee.
| Mother × Father | Brown | Green / Hazel | Blue |
|---|---|---|---|
| brown × brown | 75% | 18% | 7% |
| brown × hazel | 70% | 22% | 8% |
| brown × green | 50% | 38% | 12% |
| brown × blue | 50% | 12% | 38% |
| hazel × hazel | 50% | 36% | 14% |
| hazel × green | 40% | 45% | 15% |
| hazel × blue | 40% | 25% | 35% |
| green × green | 12% | 70% | 18% |
| green × blue | 10% | 45% | 45% |
| blue × blue | 1% | 4% | 95% |
A classic Punnett square models a single gene with two alleles — big B for the dominant brown variant and little b for the recessive blue one. Each parent contributes one allele:
The real story is more complex because green and hazel eyes need extra genes to express, but the Punnett square is still a solid mental model for why hidden recessive variants can surprise a family.
Most babies are born with eyes that look grey, dark blue, or slate. Melanin production in the iris only ramps up after birth, so eye color usually darkens and stabilizes between 6 and 12 months. A subset of children keep changing until around age 3, especially those heading toward green or hazel.
We break down the melanin timeline in Why a Baby's Permanent Eye Color Takes Months to Settle.
It's a probability estimate, not a guarantee. Eye color is polygenic — OCA2 and HERC2 on chromosome 15 are the dominant contributors, but at least 10 other genes influence pigment. Population studies show the ~75% brown / ~19% blue split for one brown-eyed and one blue-eyed parent, and our calculator matches those baselines. A real newborn can still fall outside the most likely bucket.
Yes — rare, but possible. Because eye color depends on more than one gene, a hidden variant on OCA2 or HERC2 can pass through two blue-eyed parents and produce a brown-eyed child. It happens in roughly 1 in 100 cases. We estimate a 1% chance in this scenario.
Absolutely. If both parents carry a recessive blue-eye variant, there's about a 25% chance per child that the baby gets both copies and develops blue eyes. This is one of the most common 'surprise' outcomes in the calculator.
Most babies' eye color stabilizes between 6 and 12 months, though changes can continue up to age 3. Melanin production in the iris ramps up gradually, so the light blue or grey eyes many newborns are born with often darken to green, hazel, or brown by the first birthday.
Indirectly, yes. Grandparents pass genetic variants to the parents, and any recessive allele that skipped a generation can express itself in the grandchild. This is why blue or green eyes can 'reappear' after a generation of brown.
Yes. Green eyes occur in roughly 2% of the world's population, versus about 55% brown and 8–10% blue. The green phenotype needs a specific combination of low melanin plus scattering in the iris stroma, which is why it's uncommon.
In most cases, no. After age 3 the iris is fully pigmented and the color you see is usually permanent. Adult eye-color changes are unusual and can sometimes signal a health issue worth discussing with a doctor.
Neither parent dominates on principle. Each parent contributes half of the baby's DNA, and inheritance depends on which specific alleles get passed on. A brown-eyed father with a hidden blue-eye variant contributes exactly as much as a blue-eyed mother.
A probability chart is only half the picture. For a visual AI preview of your future baby — face shape, hair color, skin tone, and predicted eye color — try the full BabyMorph AI baby generator or read more on the BabyMorph blog.
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