Baby Hair Color Predictor
Predict your baby's likely hair color based on parents' hair colors using simplified genetics. See probability percentages for each color.
Select both parents' hair colors.
How Does the Formula Work?
The baby hair color predictor uses a simplified genetic model to estimate the probability of different hair colors based on both parents' hair colors. Hair color in humans is a polygenic trait — meaning it is controlled by many genes working together — but the basic patterns of inheritance follow predictable dominant and recessive relationships that make general predictions possible.
Dominance hierarchy: Black > Dark Brown > Brown > Light Brown > Blonde
Red: separate recessive gene (MC1R)
6 hair colors × 6 = 21 unique parent combinations
Each combination → probability % for all possible baby colors
Key genetic principles:
• Dark alleles are dominant over light alleles
• Parents can carry hidden (recessive) light alleles
• Red requires two copies of the MC1R variant
• Two blonde parents rarely produce dark-haired children
• Two dark parents can produce light children (if both carry recessive alleles)
How Hair Color Genetics Works
Hair color is primarily determined by melanin — a pigment produced by melanocyte cells. Two types of melanin affect hair color: eumelanin (which produces brown and black shades) and pheomelanin (which produces red and yellow tones). The relative amounts of these pigments, controlled by multiple genes, create the full spectrum of human hair colors. The MC1R gene plays a special role — variants in this gene reduce eumelanin and increase pheomelanin, producing red hair. Because these variants are recessive, red hair only appears when a child inherits two copies.
Dominant vs Recessive
In simplified terms, alleles for dark hair are dominant over alleles for light hair. A person with one dark allele and one light allele will typically have dark hair but can pass the light allele to their children. This is why two brown-haired parents can have a blonde child — if both carry a hidden blonde allele, there is approximately a 25% chance each child inherits two light alleles and displays blonde hair. The predictor models this by assigning probability percentages that account for the likelihood of carrying recessive alleles.
Why Predictions Are Approximate
Real hair color genetics involves over 100 genes, including HERC2, OCA2, SLC24A4, SLC45A2, TYRP1, and many others beyond the simplified dominant/recessive model. Environmental factors, epigenetics, and gene interactions also play roles. Many babies are born with different hair than they will have as adults — blonde babies often darken to brown by age 10, and red-haired newborns may lighten or darken. This predictor shows general tendencies based on the most important genetic patterns, but individual results vary widely.
The Red Hair Factor
Red hair deserves special attention because it follows a clearer recessive pattern than other colors. Approximately 1–2% of the global population has red hair, but up to 40% of people in Ireland and Scotland carry one copy of the MC1R variant without showing red hair themselves. When two carriers have children, each child has a 25% chance of having red hair. The predictor assigns higher red probabilities when one or both parents have red hair, and lower but non-zero probabilities for non-red parents to reflect the possibility of hidden carrier status.
Tips & Recommendations
Black, dark brown, brown, light brown, blonde, and red — 21 unique parent combinations with probability bars.
Color-coded probability bars show each outcome's likelihood at a glance. Sorted from most to least likely.
Two dark-haired parents can have a blonde or red child. The predictor accounts for hidden recessive alleles.
Real hair color involves 100+ genes. This simplified model shows general trends — enjoy it as entertainment, not science.
Frequently Asked Questions
How does the hair color predictor work?
It uses a simplified genetics model based on dominant and recessive hair color alleles. You select each parent's hair color, and the calculator shows probability percentages for each possible baby hair color.
How accurate is this prediction?
This is a simplified model for entertainment. Real hair color genetics involves over 100 genes. The predictor shows general tendencies (dark dominates light, red is recessive) but cannot account for the full genetic complexity.
Why is dark hair dominant?
Dark hair results from higher melanin production, controlled by multiple dominant alleles. When a dark-haired parent and light-haired parent have children, dark shades are more likely because the dominant alleles mask the recessive light ones.
Can two dark-haired parents have a blonde child?
Yes. If both parents carry a recessive blonde allele, there is roughly a 25% chance each child inherits two copies. The predictor accounts for this by showing a small percentage for lighter colors.
Why is red hair treated differently?
Red hair is caused by variants in the MC1R gene and is recessive. Both parents must carry the MC1R variant for a child to have red hair. This is why two red-haired parents have a very high chance of red-haired children.
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