A simple two-gene model, for fun. At least 16 genes affect eye colour, so surprises happen — grandparents' eye colours matter too.
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Eye colour is inherited through several genes, with brown generally dominant over green and green over blue. This calculator uses the common two-gene model to estimate the chance of brown, green/hazel or blue eyes from the parents' colours.
It's a fun estimate: two brown-eyed parents can have a blue-eyed baby if both carry the gene, and grandparents' eye colours matter too.
| Father's Eye Colour | Brown |
| Mother's Eye Colour | Blue |
| Most likely eye colour | Brown or Blue / grey (about 50% each) |
| Brown | 50% |
| Green / hazel | 0% |
| Blue / grey | 50% |
| When it settles | Eye colour can change during the first year and usually settles by 1–3 years; babies of Indian, African and East Asian origin are mostly born with brown eyes that stay brown |
Brown or Blue / grey (about 50% each).
Try this example →| Father's Eye Colour | Green |
| Mother's Eye Colour | Green |
| Most likely eye colour | Green / hazel (about 75%) |
| Brown | 1% |
| Green / hazel | 75% |
| Blue / grey | 24% |
| When it settles | Eye colour can change during the first year and usually settles by 1–3 years; babies of Indian, African and East Asian origin are mostly born with brown eyes that stay brown |
Green / hazel (about 75%).
Try this example →Yes, about 1 in 16 on this model, if both carry a hidden blue gene.
Mostly in the first 6–12 months, and colour can keep shifting until about age 3.
Almost always — most babies with brown-eyed parents are born with dark eyes that stay brown.