Baby Hair Color Calculator

Hair color comes from two pigments: eumelanin, which ranges from brown to black, and pheomelanin, which is reddish. Many genes influence how much of each pigment is produced, so hair color is a spectrum rather than a single on-off switch. This calculator uses a simplified published table that groups the result into four everyday categories: black, brown, blonde and red.

Dark brown and light brown are grouped into the brown category for the probability table. The result screen tells you when that grouping happened. Red hair is the special case: it is usually linked to recessive MC1R variants, so two brown-haired parents can have a red-haired child if both carry a hidden variant. The calculator never sets red to zero for brown × brown.

Grandparent colors are optional. A grandparent with red hair raises the red probability a little, because it suggests that a parent may carry a recessive red variant. A blonde grandparent nudges the blonde probability up. These are transparent heuristics on top of the base table, not a genetic test.

The optional texture module is a separate, deliberately simple model for straight, wavy and curly hair. It is there for fun and does not change the color result. Babies' hair often changes in the first few years, and many children who start blonde darken as they grow. Treat every result as a friendly estimate, not a promise.