Baby Hair Color Predictor
Wondering whether your baby will have dark, blonde or red hair? Enter both parents' natural hair colors, and grandparents if you know them, to see which shades fit your family.
Accuracy: low鈥搈edium
Build your family tree
Tap a person, then pick their natural hair color as a child or young adult (not dyed or gray). Grandparents are optional but can reveal hidden red or light hair.
Hair color is shaped by more than a hundred genetic regions, and a parent's hair cannot show which ones they carry. So we show likelihood levels, not percentages. For comparison, blood type follows clear rules and can be predicted much more exactly.
Most expected for your family
Rare surprises (less likely, but possible)
Red or auburn hair
Clues from grandparents
How to read this: Likely = matches the parents' range 路 Possible = happens in a meaningful share of families like yours 路 Less likely = needs hidden variants 路 Unlikely = rare but not impossible. We do not show percentages because visible hair color cannot reveal the exact genes a parent carries.
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A picture of your family tree and result, made inside your browser. It is only shared if you choose to send or save it.
Understanding your result
The predictor gives two separate answers, because hair color is really two traits working together:
- Shade (black to blonde) depends mostly on how much dark pigment, called eumelanin, the hair makes.
- Red tones depend mostly on a lighter pigment, pheomelanin, which is controlled largely by the MC1R gene.
Each outcome gets one of four labels:
| Label | What it means |
|---|---|
| Likely | Falls within the range the parents show. These are the most expected outcomes. |
| Possible | Needs hidden variants, but your family details make it plausible. |
| Less likely | Can happen, but needs hidden variants from both sides of the family. |
| Unlikely, but possible | Rare for families like yours. Never treat it as impossible. |
How the hair color predictor works
- Shade range. Hair shade behaves like a trait with many small genetic effects. Children most often land within the range spanned by their parents, so those shades are marked "Likely". A black-haired and a blonde-haired parent can have children anywhere from black to blonde.
- Lighter or darker than both parents. Shades one step lighter than both parents are "Possible", because dark-haired parents can carry light-hair variants. Shades darker than both parents are less common in our model.
- Grandparent hints. If a parent's own mother or father had lighter hair, that parent may carry hidden light-hair variants, which moves lighter shades up one level (never above "Possible"). A grandparent with darker hair does the same for darker shades.
- Red hair. A red-haired parent is treated as carrying two MC1R red-hair variants. An auburn-haired parent, or a parent with a red-haired mother or father, is treated as carrying at least one. The label then follows simple inheritance: for example, a red-haired parent and a carrier parent would, in a one-gene model, give about half of their children two red-hair variants.
The full rules are on our methodology page.
The genetics of baby hair color
Two pigments, many genes
Hair color comes from the amount and type of melanin in each hair. Eumelanin gives brown and black hair; small amounts give blonde. Pheomelanin gives red and yellow tones. According to MedlinePlus Genetics, the type and amount of melanin is determined by many genes, and little is known about most of them.
A 2018 study of nearly 300,000 people of European ancestry (Hysi and colleagues, Nature Genetics) found 124 genetic regions linked to hair color, more than 100 of them new. With so many genes involved, two parents can pass on many different mixes, which is why siblings often have different shades.
Red hair and the MC1R gene
MC1R is the best-studied hair color gene. When both copies carry certain changes, the pigment pathway makes mostly pheomelanin and the hair is almost always very red. One changed copy can give strawberry blonde, auburn or red tones. In the UK Biobank, about 93% of red-haired people carried two MC1R variants, but only about 15% of people with two variants actually had red hair (Morgan and colleagues, 2018). Other genes matter, so even two red-haired parents cannot be promised a red-haired baby.
Why baby hair changes
Many babies are born with fine, light hair that darkens through childhood. MedlinePlus Genetics notes this is especially common in people of European descent, and many blonde children have darker hair by adolescence. The predictor describes natural childhood and young adult hair, not newborn hair.
Accuracy and limitations
- Visible hair color cannot reveal which variants a parent carries, so results are likelihood levels, not percentages.
- The model simplifies more than a hundred genetic regions into two rules: a shade range and a red-hair gene.
- Most large hair color studies were done in people of European ancestry. The model may describe other families less well.
- It does not predict gray hair, texture, or how fast an individual child's hair will darken.
- Dyed or graying hair gives wrong inputs. Use each person's natural color when young.
- It is not a paternity test or a medical test.
Frequently asked questions
Can two dark-haired parents have a blonde baby?
Yes. Hair color depends on many genes, and dark-haired parents can carry variants for lighter hair without showing them. If both parents pass on enough of these variants, a child can have noticeably lighter hair. It is more likely when a grandparent had light hair.
Can my baby have red hair if neither parent has red hair?
Yes, but it is uncommon. Red hair mostly comes from variants in the MC1R gene. A parent can carry one variant without having red hair. If both parents carry one and both pass it on, the child can have red hair. A red-haired grandparent on each side makes this more plausible.
Does baby hair color change?
Often, yes. MedlinePlus notes that light hair may darken as people grow older, especially in people of European ancestry, and many blonde children have darker hair by adolescence. A newborn's hair is not a reliable preview of their adult color.
Is dark hair dominant over light hair?
Not in a simple one-gene way. Older textbook examples treat dark hair as dominant, but hair shade is controlled by more than a hundred genetic regions that each add a small effect. That is why this tool shows likelihood levels instead of a single answer.
Why do you not show exact percentages?
Because they would be guesses dressed up as facts. A parent's visible hair color does not reveal which of the many hair-color variants they carry, so no honest calculator can give a precise percentage from hair colors alone. Blood type is different, and our blood type tool will show exact probabilities.
How accurate is this hair color predictor?
We rate it low to medium. It gives a reasonable picture of which shades fit your family, but it cannot see your genes, does not model every pigment gene, and cannot predict age-related darkening for an individual child.
Scientific sources
- MedlinePlus Genetics (U.S. National Library of Medicine).Is hair color determined by genetics?
- MedlinePlus Genetics. MC1R gene.
- Morgan MD, et al. Genome-wide study of hair colour in UK Biobank explains most of the SNP heritability.Nature Communications. 2018;9:5271.doi:10.1038/s41467-018-07691-z
- Hysi PG, et al. Genome-wide association meta-analysis of individuals of European ancestry identifies new loci explaining a substantial fraction of hair color variation and heritability. Nature Genetics. 2018.doi:10.1038/s41588-018-0100-5