What an Eye Color Calculator Does
An eye color calculator estimates a baby's likely eye color from the parents' (and sometimes grandparents') eye colors.
It applies probability models based on genetics, so it gives you odds, not a guarantee.
The Genetics Behind Eye Color
Eye color is polygenic, meaning several genes shape it, especially OCA2 and HERC2, along with others like SLC24A4, TYR, and IRF4.
That is why the old "two blue-eyed parents can't have a brown-eyed child" rule is not always true. Inheritance is more layered than a single dominant gene.
Where Hazel and Green Fit In
Calculators that include hazel and green are more realistic, because these shades come from a mix of pigment and light scattering rather than a simple on/off gene.
A child can end up with hazel or green eyes even when neither parent has exactly that shade, depending on the combination of genes passed down.
Baby Eye Color Changes Over Time
Many babies are born with lighter eyes because melanin has not fully developed. Eye color usually settles by around age 3.
A baby with blue eyes at birth may end up with hazel, green, or brown eyes as melanin increases over the first few years.
From Prediction to Real Color
A calculator is fun for curiosity, but to know an actual eye color, you need to look at the iris itself once the color has settled.
At that point, an AI analysis from a photo identifies the exact shade and hidden undertones far more reliably than any genetic prediction.
