Color of Baby's Eyes Calculator

Determine the probable eye color of your baby using our genetics-based eye color calculator. This tool uses the most common eye color combinations to predict your baby's eye color based on your and your partner's eye colors.

How the Eye Color Calculator Works

Eye color is determined by a combination of genetic factors. The most common eye colors are brown, blue, green, and hazel. The calculator uses a simplified genetic model to predict the most likely eye color combination based on your and your partner's eye colors.

Eye color prediction is based on the following genetic principles:

Brown eyes are dominant over blue eyes
Green eyes are a combination of brown and blue genes
Hazel eyes are a mix of brown and green

The calculator uses a probability matrix to determine the most likely eye color based on the input colors. While genetics is the primary factor, other factors like environment and age can influence the final eye color.

How to Use This Calculator

Select your eye color from the dropdown menu
Select your partner's eye color from the dropdown menu
Click the "Calculate" button to see the predicted eye color
Review the probability chart for all possible outcomes

For the most accurate prediction, use the eye colors of both parents. If one parent's eye color is unknown, the calculator will use the most common eye color for that parent.

Eye Color Genetics

Eye color is primarily determined by the OCA2 gene, which is located on chromosome 15. This gene produces a protein called oculin, which helps regulate melanin production in the iris.

Common Eye Color Alleles

Brown eyes: OCA2 gene with normal function
Blue eyes: OCA2 gene with a mutation that reduces melanin production
Green eyes: Combination of brown and blue eye alleles
Hazel eyes: Mix of brown and green eye colors

Other factors that can influence eye color include:

Age (eyes tend to lighten as we age)
Sun exposure
Eye conditions
Genetic mutations beyond the OCA2 gene

Common Eye Color Combinations

The table below shows the most common eye color combinations and their predicted outcomes:

Parent 1	Parent 2	Most Likely Baby's Eye Color	Probability
Brown	Brown	Brown	90%
Brown	Blue	Brown	75%
Blue	Blue	Blue	85%
Green	Green	Green	80%
Brown	Green	Brown or Green	60%

These are general probabilities and actual outcomes may vary based on individual genetics.

Factors That Affect Eye Color

While genetics is the primary factor, several other factors can influence your baby's eye color:

Environmental Factors

Sun exposure can cause eyes to lighten over time
Certain medications can affect eye color
Eye conditions like albinism or heterochromia can cause unusual eye colors

Age

Eye color tends to lighten as we age. This is most noticeable in brown eyes, which may become lighter brown or even blue as we get older.

Other Genetic Factors

Beyond the OCA2 gene, other genes can influence eye color. For example, the HERC2 gene can affect eye color in people of African descent.

Frequently Asked Questions

Can eye color change over time?

Yes, eye color can change due to aging, sun exposure, and certain medical conditions. Brown eyes often lighten with age, while blue eyes may become lighter blue or even green.

Are there other eye colors besides brown, blue, green, and hazel?

Yes, rare eye colors include gray, amber, and violet. These are often caused by genetic mutations or eye conditions.

Can eye color be predicted with 100% accuracy?

No, eye color prediction is probabilistic. While genetics provides a strong indication, other factors can influence the final eye color.

What if one parent's eye color is unknown?

The calculator will use the most common eye color for the unknown parent. You can adjust this if you have additional information.

Can eye color be changed?

No, eye color is determined by genetics and cannot be changed. However, certain eye conditions or treatments may affect the appearance of the eyes.