Eye Color Inheritance Calculator
Estimate the chance your child will have brown, green or blue eyes from each parent's eye color, using the established eye-color inheritance chart. Results are population-based estimates — eye color is controlled by many genes.
Estimated eye color of the child
Eye color inheritance calculator: what it does
This eye color inheritance calculator estimates the probability that a child will have brown, green or blue eyes based on both parents' eye colors, using the widely published empirical inheritance chart. Because eye color is polygenic (influenced by many genes), these are population-based probabilities, not guarantees — almost any parent pair can produce a range of outcomes.
How eye color inheritance actually works
Eye color comes from the amount and distribution of melanin in the front layer of the iris: a lot of melanin looks brown, a moderate amount looks green or hazel, and very little produces blue (blue is a structural/scattering effect, not a blue pigment). This is controlled by many genes, not one. The OCA2 and HERC2 genes on chromosome 15 have the biggest effect on the blue–brown spectrum — a switch in HERC2 (the rs12913832 variant) turns OCA2 activity up or down — but at least 16 genes (and over 100 genetic associations) contribute to the full range.
Eye color inheritance chart
The table below shows the approximate chance of each eye color for a child, by the parents' eye colors. Values are symmetric (Parent 1 × Parent 2 is the same either way).
| Parent 1 × Parent 2 | Brown | Green | Blue |
|---|---|---|---|
| Brown × Brown | 75% | 18.8% | 6.3% |
| Brown × Green | 50% | 37.5% | 12.5% |
| Brown × Blue | 50% | 0% | 50% |
| Green × Green | 0% | 75% | 25% |
| Green × Blue | 0% | 50% | 50% |
| Blue × Blue | 0% | 1% | 99% |
Hazel, amber and gray are intermediate shades on the same melanin spectrum. If you pick "hazel," the calculator approximates it as a green–brown intermediate, since robust hazel-specific probabilities are not established.
How to use the calculator
- Select Parent 1's eye color.
- Select Parent 2's eye color.
- Click Calculate to see the estimated percentage for brown, green and blue.
- Read the result as a probability, not a certainty — then export or copy it if you like.
Worked example
One brown-eyed parent and one blue-eyed parent. From the chart, the child has about a 50% chance of brown eyes and a 50% chance of blue eyes, with green unlikely. If the brown-eyed parent happens to carry a hidden variant for green, a green-eyed child becomes possible too — which is why real outcomes can differ from the headline numbers.
Will a baby's eye color change?
Often, yes. Many babies — especially those of European ancestry — are born with lighter blue or gray eyes because melanin is still developing. A baby's more permanent eye color usually settles by 6 to 12 months, though subtle darkening can continue for a couple of years.
Limitations & disclaimer
This calculator is an educational estimate based on population-level data and a simplified three-color model (brown/green/blue). It cannot account for every gene, ethnicity-specific frequencies, heterochromia, or medical conditions affecting the iris. It is not a paternity test and not medical advice. For questions about a specific genetic condition, consult a physician or a certified genetic counselor.
Frequently asked questions
Can two brown-eyed parents have a blue-eyed child?
Yes. If both brown-eyed parents carry recessive variants for lighter eyes, a child can inherit blue or green eyes. From the chart, two brown-eyed parents have about a 6% chance of a blue-eyed child and about 19% chance of green.
Can two blue-eyed parents have a brown-eyed child?
It's rare but possible. Two blue-eyed parents have roughly a 99% chance of a blue-eyed child and about 1% green; brown is very unlikely but not impossible because eye color is polygenic.
Is eye color determined by a single gene?
No. It's polygenic. OCA2 and HERC2 on chromosome 15 have the largest effect on the blue–brown spectrum, but at least 16 genes contribute, so the single-gene model is unreliable.
When does a baby's true eye color appear?
Usually by 6 to 12 months, as melanin develops. Eyes often start lighter and darken; subtle changes can continue for a few years.
Is green dominant over blue?
Roughly, brown tends to dominate green and green tends to dominate blue — but it's a simplification. Because several genes interact, outcomes are better given as probabilities.
Does this work as a paternity test?
No. Eye color cannot confirm or rule out biological parentage. Use it for curiosity and education only.
What is the rarest eye color?
Green is the rarest common color (about 2% of people). Gray, amber and true heterochromia are also uncommon.
Do grandparents' eye colors matter?
Yes. Parents can carry hidden variants from grandparents and pass them on, so a child's eyes sometimes resemble a grandparent's.
References
- MedlinePlus Genetics (U.S. National Library of Medicine) — Is eye color determined by genetics?
- HudsonAlpha Institute for Biotechnology — The Genetics of Eye Color
- American Academy of Ophthalmology — eye color and iris pigmentation resources.
Creator
Shakeel Muzaffar is the Founder and Editor-in-Chief of MultiCalculators.com, bringing over 15 years of experience in digital publishing, product strategy, and online tool development. He leads the platform's editorial vision, ensuring every calculator meets strict standards for accuracy, usability, and real-world value. Shakeel personally oversees content quality, formula verification workflows, and the platform's commitment to publishing tools that are genuinely useful for students, professionals, and everyday users worldwide.
Areas of Expertise: Editorial Leadership, Digital Publishing, Product Strategy, Online Calculators, Web Standards
