How many people were born on your exact day? Of them, how many share your gender? And of those — if you ever met — how many could trade clothes with you, and stand close enough to see eye to eye? They may be strangers, but they were born with you.
A collaboration between Poetry Culture & The Studies Show
Every figure here is an estimate, not a record of real people. Starting from total global births in your birth year, I count the slice born on your exact calendar date, halve it roughly to your gender, then narrow to people standing within about an inch of your height. The life-outcome rates are applied to that group as global averages; real outcomes vary enormously by country, wealth, and circumstance, which is the point of this page.
A few figures move with your birth year. Secondary-school completion and literacy are both set by birth decade and gender — far lower for people born early in the last century, and lower still for women then, with the gaps closing (and reversing in places) for those born since 2000. The share no longer living is a rough global cohort estimate that folds in the much higher child mortality older generations faced; it is not a regional or personal prediction. The calculator accepts birth years back to 1926 (age 100), though it's tuned for accuracy mainly for people aged 80 and under — figures for the oldest cohorts are rougher.
One deliberate simplification, partly addressed: the tool builds on a single worldwide height curve, shifted shorter for older birth years (people have grown taller over the last century, so your percentile is judged against your own generation). The language shares are also tilted by your height, since height correlates with region — taller cohorts lean toward European-language speakers, shorter ones toward South and Southeast Asian languages. It's a rough kernel weighting, not a full nationality model, so the remaining life-outcome rates (wealth, food, connectivity) stay global averages. Read them as "the world your body was born into," not a precise regional portrait.
Internet use is adjusted for age — younger cohorts are far more connected (the ITU finds roughly four in five people aged 15–24 are online, versus about 74% of the world overall), so a younger birth year reads higher. The roughly one-third of humanity still offline isn't on remote islands: it's concentrated in rural South Asia and sub-Saharan Africa, with India alone home to over 400 million people who have never been online. Food insecurity uses the FAO's measure of moderate or severe food insecurity in a single year (~28% of the world); a true once-in-a-lifetime rate would be higher. Language shares are total speakers as a share of world population, and because many people are multilingual they overlap and don't sum to 100%.
If you add your blood type, the compatibility figures follow standard red-cell rules across the ABO and Rh systems — O-negative is the universal donor, AB-positive the universal recipient — applied to a rough global type distribution. Eye color uses rough global frequencies (brown is by far the most common worldwide), now lightly tilted by your height like the languages, since blue, green and gray eyes cluster in taller European populations. Your Chinese zodiac sign accounts for the lunar new year — which falls between late January and late February — so births early in the year are correctly assigned to the previous animal.
Sources:
Born With You — a collaboration between Poetry Culture and The Studies Show, built by Alexander Webb and vibe coded with love with Claude.