When you select traits on Avortas, we calculate how rare your combination is using the multiplication rule for independent events. Each trait has a known frequency in the global population — for example, green eyes occur in roughly 2% of people, while O+ blood is found in about 38%. When two traits are independent (not genetically linked), the probability of having both is simply the product of their individual probabilities.
For example, if 2% of people have green eyes and 7% have red hair, the probability of having both is 0.02 × 0.07 = 0.0014, or about 1 in 714 people. Add more traits and the number shrinks rapidly — this is why having just 5 or 6 common traits together can make you statistically rare. Our calculator applies this math across all the traits you select and shows how many people on Earth would statistically share your exact combination.
Keep in mind: some traits are correlated (like skin color and hair color), so the true probability may differ slightly from a pure multiplication model. We account for major correlations where data is available, but the result should be treated as an estimate rather than an exact figure. The goal is to give you a meaningful sense of just how unique your particular combination is among 8 billion people.