Family & growth tools
Baby Genetic Predictor
Combine both parents' traits to estimate your child's adult height, eye color and hair color using science-inspired probability models.
Height predictor
Estimate your child's adult height using the mid-parental height formula and a normal distribution to show a likely range.
Mother's height
Father's height
Predicted adult height
177 cm • 5′10″
Likely range (≈95% of children): 167–187 cm (5′6″ – 6′2″)
Eye color predictor
A polygenic-inspired probability model, based on common charts used by genetic counselors, to estimate eye color outcomes.
Parent eye colors
Most likely: Brown (50%)
Values are approximate and based on generalized population data.
Probability by eye color
Hair color predictor
Approximate hair color probabilities including dark, light, blonde and red phenotypes, assuming simplified inheritance of key genes such as MC1R.
Parent hair types
Most likely hair color: Light brown (45%)
Real-world genetics involve many genes; these values are illustrative, not diagnostic.
Probability by hair color
How this baby genetic predictor works
This tool combines classic mid-parental height calculations, polygenic-style eye color charts and simplified hair color inheritance models to give you visually clear, probabilistic insights into likely traits. It is for educational and illustrative purposes only and is not a medical or genetic test.
- Height: uses a normal distribution with a ±4" range around the mid-parental prediction.
- Eye color: based on aggregated counselor-style probability grids for brown, hazel, green, blue and gray eyes.
- Hair color: models dark, light, blonde and red outcomes using simplified dominance and recessive patterns.
How the Baby Genetic Predictor estimates traits
This baby genetic predictor is designed to be an educational way to explore how probabilities show up in common traits like adult height, eye color, and hair color. It does not read DNA, it does not know your family tree, and it cannot account for medical history or ancestry in the way a real genetic test might. Instead, it combines a few well-known population-style models into one clear interface so you can see approximate outcomes and how sensitive they are to different parent traits.
Height prediction: mid-parental height + natural variation
For height, the tool uses the classic mid-parental height formula, which is a rough method often used to estimate a child’s adult height from parent heights. Real outcomes vary widely because height is polygenic (influenced by many genes) and also shaped by environment, nutrition, and health over childhood. To reflect that uncertainty, the tool shows a likely range around the estimate and visualizes a simple probability distribution rather than one “exact” number.
Eye and hair color: probability charts, not Mendelian certainty
Eye color and hair color are not single-gene traits in the way simple classroom genetics examples sometimes imply. Multiple genes interact, and different populations have different baseline frequencies. For that reason, this tool uses counselor-style probability tables as an approximation. The donut chart for eye color and the percentage bars for hair color are meant to communicate relative likelihoods, not guarantees.
- Eye color calculator: estimates probabilities for brown, hazel, green, blue, and gray outcomes based on common parent-pair charts.
- Hair color genetics: uses simplified dominance patterns and a recessive-style red hair model to estimate black, brown, blonde, and red outcomes.
Privacy: your inputs stay on your device
Like the rest of LifeHackToolbox, this calculator runs entirely in the browser. There is no login, no account, and no server upload of the values you enter. That means you can explore different combinations privately, export an image if you want to share results, and then close the page without leaving data behind on a backend.
If you want to keep exploring family and growth tools, you can also try the Baby Name Generator or the Baby Kick Counter.