The Human Rarity Score is not a random number. Here is exactly how it works — the data sources, the weighting logic, and what each tier represents.
Your rarity score combines two distinct categories of information:
Together, these produce a composite score between 0 and 100. No single answer makes you rare or common — it is the combination that matters.
Name rarity is estimated using birth registration data from the UK Office for National Statistics (ONS), US Social Security Administration records, and global name frequency research. Names shared by more than 1 in 50 people score lower; names shared by fewer than 1 in 200 score significantly higher.
Eye colour prevalence data is drawn from published population genetics research. Brown eyes appear in 55–79% of the global population; green eyes in approximately 2%; grey eyes in under 1%; heterochromia in under 0.06%. These ratios directly inform the eye colour rarity score.
Birth frequency varies significantly by month due to seasonal conception patterns. September is statistically the most common birth month in many countries; February the least common. Scores reflect the inverse of population frequency for each month.
Questions about social style, emotional processing, self-perception, and motivation are scored against research into personality trait distributions. Profiles associated with introversion, high emotional sensitivity, systems thinking, and existential curiosity tend to score higher on rarity — because they are statistically less common in the general population.
Each question produces a rarity score between 0 and 100. The final score is calculated using a weighted average with a bonus multiplier applied for rare trait combinations — because having two or three genuinely rare characteristics simultaneously is exponentially rarer than having just one.
The formula is: Base average + (number of responses scoring above 70 × 2.2), capped at 99.
Your profile is shared by the majority of people. This is not a negative result — common profiles are highly relatable and easy to connect with. Most people score here.
Your combination of traits is noticeably less common than average. Roughly 1 in 3 people share a similar profile.
Genuinely rare. Only about 1 in 7 people share your profile type. You have a meaningfully distinct combination of characteristics.
Top 5% of rarity. Fewer than 400 million people on Earth share your combination of traits. Statistically remarkable.
Top 1%. In the entire history of humanity, very few people have shared your exact constellation of traits and personality profile.
The Human Rarity Score is designed to be fun, thought-provoking, and broadly informative. It is not a clinical psychological assessment, a genetic test, or a diagnostic tool of any kind. The scores are approximations based on available population data and should be treated as such. For more information, see our Terms of Use.