1in8B - A life, one in 8 billion
Right now, about four babies are born every second. Next, it's your turn to become one of them. Where you're born, your family, your sex — all decided by the world, just as it once was for you. Then you live that person's whole life in a few minutes.
The Book of Lives
- Be born somewhere in the world.
- Choose what matters as the years pass.
- Keep the moments that make this life yours.
If you were born right now
Weighted by each country's yearly births — being born in India is about 175× as likely as in Taiwan.
Includes child death, poverty, illness, war and loss. This fictional simulation combines statistical background with game rules; it does not reproduce real-world event rates individually. Recommended for ages 15 and above.
One in 8 billion: where might you be born?
What is 1in8B?
1in8B is a free browser life simulator about one in 8 billion. Begin with a random birth, follow a character’s life and make decisions when events arise. You do not need a download or an account.
Follow a life at reading pace. Stop at a turning point, open the country profile and see how its statistical background relates to the character's story.
Follow one life through the years and decide how to respond at its turning points. One in 8 billion begins with circumstances you do not choose; the events, your decisions and the moments you keep form this character’s story.
Put the birth certificate's odds in context
A country's share is its annual births or population, according to this life's draw mode, divided by the corresponding total in the dataset. The certificate turns that share into an approximate one-in-N figure. It describes the chance of drawing a birthplace in this model, rather than recreating every detail of one child. Each new life is another draw, so returning to the same country is possible.
Read the four states with the timeline
Health, Joy, Mind and Bonds show the character's game state as it changes. Look at a focus option's effect hints before choosing it; study, work and time with friends can make different trade-offs. Open the profile to read the country indicators alongside the story. A high score promises no particular ending, and a national average cannot serve as a personal forecast.
How birthplace weights work
1in8B draws from a dataset covering 172 countries. Annual births supply the default weights; before a new life, you can instead choose population weights from the same dataset. Both modes start at age 0, and countries do not have equal 1-in-172 chances. These are the simulation's probabilities, rather than a calculation of your personal chance of being born somewhere.
Choose your own pace
Read the birth certificate, then choose a focus as life moves forward. You can answer event choices yourself or enable automatic choices. Adjust the speed, pause to catch up with the timeline and star favourite moments. The character profile adds context, and the life summary gathers the outcome when the story ends.
Read the story alongside the numbers
Country statistics provide a background for the simulation; decisions and random events affect what happens within it. National averages cannot account for every individual. A simulated lifespan or cause of death is a game result, not a forecast of your health, income or future.
Data sources and limits
The data notes cite UN World Population Prospects 2024 and World Bank World Development Indicators (WDI). Complete reference years and original values are not recorded for every indicator, so figures are not guaranteed to be current or to match the databases’ present values. The links below explain the indicators and original statistics; they do not verify every game value.
Source databases
Before you begin
Can I choose my country of birth?
No. You can choose weights based on annual births (the default) or population, but you cannot select a particular country. Each new life is another draw and may begin in the same country.
Do I need to register or pay?
No. You can play in the browser for free without creating an account.
Can I return to an unfinished life?
Yes, when browser storage is available. Saves belong to this browser and website; other domains or devices have separate progress, and clearing site data can remove saves.
What changes when I switch language?
The game supports 14 language options. Life history and cause of death translate too, and the current life continues rather than restarting.