What will the world population be in 2100?

By 2100 the world is projected to be home to about 10.19 billion people under the UN's medium scenario, up from roughly 8.13 billion in 2024 but growing far more slowly than in the 20th century. The global total passes through about 9.64 billion around mid-century before flattening out.

The composition of that population will have shifted dramatically. Africa's share rises sharply, several of today's largest countries fall down the rankings, and the world as a whole is markedly older. The end-of-century figure is best understood as the midpoint of a wide range that depends, above all, on how fertility evolves.

These projections come from the United Nations World Population Prospects 2024, the most widely used source for long-range demographic estimates. They are scenarios, not predictions. But the broad shape of the century ahead, a slowdown and eventual peak, is consistent across the main variants.