A population clock is a real-time estimator that uses demographic data to project population changes between official census updates. Since no one is counting every birth and death in real time, the clock relies on statistical models.

The core inputs are birth rates, death rates, and migration rates, typically sourced from national statistical offices and international bodies like the United Nations Population Division and the World Bank. These rates are applied to a base population to estimate changes over time.

Globally, about 4.3 babies are born and 1.7 people die every second, yielding a net increase of roughly 2.6 people per second. That translates to about 226,000 more people each day and over 80 million per year.

Our dashboard pulls base data from the World Bank Open Data API and the UN World Population Prospects, then interpolates in real time using each country's growth rate. The counter updates every second to give you a live feel for the pace of global population change.

It's important to note that these are estimates, not exact counts. Census data is typically collected every 10 years, and even birth and death registration systems have gaps in many countries. The clock is a best-effort approximation that becomes more accurate as new data arrives.