Baby Hair Color Calculator
Find out what hair color your baby is likely to have — based on the genetics of both families.
STEP 1
Predict Your Baby's Hair Color
Hair color is one of the most complex traits in human genetics — controlled by over a dozen genes, not just one. Enter both parents' and grandparents' hair colors below, and our calculator will estimate the probability of each hair color your baby could inherit, including rare outcomes like red hair.
STEP 2
Your Baby's Hair Color Revealed
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Frequently Asked Questions
Hair color genetics can be full of surprises. Here are the questions parents ask most about our baby hair color calculator.
How does the Baby Hair Color Calculator work?
Unlike eye color — which is largely controlled by one or two genes — hair color is a polygenic trait influenced by over a dozen genes. Our calculator focuses on the most impactful ones, including the MC1R gene (responsible for red hair) and the genes controlling eumelanin and pheomelanin levels. By analyzing both parents' and grandparents' hair colors, we estimate probability percentages for each hair color your baby could inherit.
Can two brunette parents have a blonde or red-haired baby?
Yes, and it's more common than people think. Many people carry recessive genes for lighter or red hair without expressing them. If both parents carry a hidden blonde or red hair gene (often traceable to grandparents), there's a real chance their baby inherits both copies and expresses that color. Our calculator specifically accounts for this by factoring in grandparent hair colors.
Why do I need to enter grandparents' hair colors?
Grandparents reveal hidden genetics. A parent with brown hair might carry a recessive blonde or red gene they inherited from their own parent — a gene that never showed up in them but could easily show up in your baby. The more family data you provide, the more accurately we can map out the full range of possibilities. You can leave any field as "Unknown" if you're not sure.
Is the Baby Hair Color Calculator free?
Yes — the hair color calculator is completely free to use. If you want to go further and see what your baby will actually look like, you can generate a realistic AI photo of your future baby using PredictMyBaby's AI Baby Generator.
Does my baby's hair color change after birth?
Often, yes. Many babies are born with darker hair that lightens significantly in the first year, or with very light hair that gradually darkens through childhood. The hair color your baby settles into by age 3–5 is a better indicator of their permanent color. Our calculator predicts the likely settled color based on family genetics, not just the newborn shade.
How accurate is the Baby Hair Color Calculator?
Hair color is one of the harder traits to predict precisely because so many genes contribute to it. Our calculator is most accurate for common outcomes (dark hair from two dark-haired families) and provides meaningful probability ranges for surprising outcomes like red or blonde hair. Think of it as an informed genetic estimate — educational, fun, and a great conversation starter for expecting parents.
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