Baby Eye Color Calculator

A baby's eye color develops from the amount and distribution of melanin in the iris. Brown eyes generally contain more melanin, green or hazel eyes contain an intermediate amount, and blue eyes contain relatively little. Genes influence how pigment is produced and arranged, but eye color is not controlled by one simple brown-versus-blue switch. Researchers have identified multiple genes, including important variants near OCA2 and HERC2, that work together to create a broad spectrum of shades. This calculator uses a simplified inheritance table based only on the visible eye colors of two biological parents. It reports approximate chances for three broad categories: brown, green, and blue. The model is useful for illustrating why two parents can have children with different eye colors, but it cannot account for every gene carried by the parents. Grandparents and earlier relatives can pass along variants that are not obvious from a parent's appearance, so family history may change the real probability substantially. The percentages describe possibilities, not a prediction for an individual child. A 50 percent chance does not guarantee that half of a particular family's children will have that color. Each conception is a separate combination of inherited variants. The categories also simplify hazel, amber, gray, and mixed-color eyes, which do not fit neatly into three labels. Lighting, pupil size, clothing, camera settings, and surrounding colors can make the same iris appear different. Many newborns, especially those with less pigment at birth, have blue-gray eyes that darken as melanocytes produce more melanin. Most changes happen during the first year, though subtle shifts can continue into early childhood. For that reason, an infant's early eye color may not be permanent. Changes later in life, a sudden difference between the two eyes, pain, or visual symptoms should be discussed with an eye-care professional. Use this estimate as a fun introduction to genetics rather than medical or paternity evidence. Only genetic testing can examine the relevant variants directly, and even modern tests may express eye color as probabilities. The diversity of real eye color reflects polygenic inheritance, ancestry, development, and natural variation that no short calculator can capture completely.