Baby Eye Color Calculator

Health

Predict the likely eye color of a baby based on the parents' eye colors using Mendelian genetics.

Formula

Based on simplified Mendelian genetics for OCA2/HERC2 eye color genes
  • Simplified model: Brown > Green > Blue in dominance.
  • Actual eye color involves multiple genes (OCA2, HERC2, SLC24A4, etc.).
  • Two blue-eyed parents: ~98% chance of blue eyes.

Brown-eyed parent + Blue-eyed parent

Inputs
  • Parent 1 Eye Color: brown
  • Parent 2 Eye Color: blue

50% chance of brown eyes, 25% green, 25% blue.

Frequently asked questions

Is this genetically accurate?
It is a simplified model. Actual eye color genetics involves multiple genes and is more complex.
Can two blue-eyed parents have a brown-eyed baby?
Very rarely (about 1%). It can happen if one parent carries a recessive brown gene variant.
When do baby eye colors finalize?
Eye color is usually set by 12 months but can continue changing up to age 3.
What determines eye color?
The amount and distribution of melanin in the iris, controlled primarily by the OCA2 and HERC2 genes.