Wondering whether your baby will have brown, green or blue eyes? Choose the parents' eye colors (and the grandparents' if you know them) to see the odds from a classic two-gene inheritance model. It's a fun estimate: real eye color depends on many genes.
Last updated:
Grandparents (optional)
Enter your values to see the result.
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How to use the Baby Eye Color Calculator
Pick the mother's and father's eye colors. Hazel counts as green and gray as blue.
Optionally tick the grandparents box and enter any grandparents' eye colors you know; leave the rest as Unknown.
Press Calculate odds to see the chances of brown, green and blue eyes.
Read the steps to see how hidden (recessive) alleles change the result.
Remember it's an estimate: babies' eyes can change color during the first year.
How eye color is inherited in this model
Genes (bey2 / gey)
Eye color
Why
BB or Bb / any
Brown
One brown allele is enough: brown is dominant over everything
bb / GG or Gb
Green / hazel
No brown allele, at least one green allele
bb / bb
Blue / gray
Only recessive alleles on both genes
Example: a brown-eyed mother with a blue-eyed parent must be Bb. With a blue-eyed father (bb/bb), each child has a 1 in 2 chance of getting her B allele and brown eyes; otherwise the green gene decides between green and blue.
Odds for common parent combinations
Parents
Brown
Green / hazel
Blue / gray
Brown × Brown
88.9%
8.3%
2.8%
Brown × Green
66.7%
27.8%
5.6%
Brown × Blue
66.7%
16.7%
16.7%
Green × Green
0%
88.9%
11.1%
Green × Blue
0%
66.7%
33.3%
Blue × Blue
0%
0%
100%
These figures assume no grandparent information and equally common alleles. Real-world results vary, and because many genes are involved, surprises happen in every family.
Frequently asked questions
How is baby eye color predicted?
This calculator uses a classic simplified model with two genes. One gene (bey2) has a dominant brown allele; the other (gey) has a green allele that is dominant over blue. Each parent passes one copy of each gene at random, and the calculator adds up every combination, like a two-gene Punnett square.
Can two blue-eyed parents have a brown-eyed baby?
In the simple two-gene model, no: blue-eyed parents only carry blue alleles. In real life it is rare but possible, because eye color is influenced by many genes, mainly OCA2 and HERC2 on chromosome 15 plus several others.
Why do grandparents matter?
A brown-eyed parent may carry a hidden non-brown allele. If one of their parents has blue eyes, they must have inherited a non-brown allele from that parent, which raises the baby's chance of lighter eyes. Without grandparent information the calculator assumes the alleles are equally common.
When does a baby's eye color become permanent?
Many babies, especially of European ancestry, are born with blue or gray eyes because melanin in the iris is still developing. Color usually settles by 6 to 12 months, and occasionally keeps changing until about age 3.
How accurate is this calculator?
It gives reasonable odds for the common cases but cannot be exact, because the real genetics involve more than two genes and many shades. Treat the percentages as a fun guide, not a prediction.
Which eye color is most common?
Brown is by far the most common eye color worldwide. Blue eyes are common mainly in people of northern European ancestry, and green is among the rarest colors.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.