Nigeria: The Country Rewriting the Population Rankings

By the populationclock.org team · Published September 17, 2026 · All figures: UN World Population Prospects 2024, medium variant

The short answer

Nigeria holds about 240 million people in 2026, which makes it 6th in the world and the largest country in Africa. The medium variant of the UN projection puts it near 357 million by 2050 and 477 million by 2100, a gain of roughly 237 million people, or about 99% on top of what is there now. That is enough to move it from 6th to 4th in the global size table, behind only India, China and Pakistan.

The two crossings that get noticed happen in the middle of the century. Nigeria passes Indonesia around 2041, covered on our Nigeria overtakes Indonesia page, and the United States around 2057, on the Nigeria overtakes the United States page. By 2100 the gap is no longer close: 477 million against 421 million, which you can see side by side on our Nigeria vs United States comparison.

It has been climbing this table for seventy years

None of this is a new trend. In 1950 Nigeria was 14th in the world, with about 36.9 million people. It crossed 100 million in 1992 and 200 million in 2018, and along the way it moved past Japan around 2001, Russia around 2006 and Brazil around 2019. The projection simply continues a ladder it has been climbing steadily for three generations: about 2038 for 300 million, about 2061 for 400 million.

What changes is the company it keeps. The countries still ahead of it are not shrinking so much as slowing: Indonesia is growing at about 0.7 percent a year and peaks around 2059, while the United States grows at roughly 0.5 percent and keeps growing through the horizon. Nigeria, at about 2.0 percent a year, passes them both by holding a pace they gave up decades ago rather than by accelerating. The full national detail sits on our Nigeria population page.

The engine is births, and nothing else

Nigeria records about 7.7 million births in 2026 against roughly 2.8 million deaths: one birth every 4.1 sec, one death every 11 sec, and a natural increase of some 4.9 million people in a single year. Net migration is modelled at a net outflow of roughly 2,810 people, which against a population of 240 million is indistinguishable from zero. Everything Nigeria gains this century, it gains at home.

Measured by babies rather than by people, Nigeria is already 3rd in the world, behind India and China, and supplies roughly 6% of the children born on earth this year while holding about 3% of the world’s people. Around 2048 it passes China on that measure too, and by 2050 the projection already has it 2nd in annual births worldwide, behind only India.

Nigeria is not the fastest-growing country

This is the part most coverage gets wrong. In percentage terms Nigeria grows by about 107% between 2024 and 2100, which places it 21st among the 65 countries in this dataset with more than 20 million people today. Angola, DR Congo and Tanzania all grow faster relative to their current size, and the leaders of our fastest-growing countries list are faster still.

In absolute terms it looks different but still not first: Nigeria adds about 237 million people between 2026 and 2100, which is 3rd in the world behind DR Congo and Pakistan. What makes it the country that rewrites the rankings is the combination, a large base growing at a sustained rate, rather than either one alone. Its 237 million gain is equivalent to roughly 12% of the net growth of the entire world over the same stretch, a figure that says as much about how many countries are shrinking as about Nigeria.

One more corrective. Nigeria’s share of Africa actually falls, from about 15.3% today to roughly 12.5% in 2100, because several other African countries grow faster. Its share of the world rises from 2.9% to about 4.7%. Both things are true at once, and the continental picture behind them is in the African century and in our African century ranking, which Nigeria heads.

Why the growth runs so long

Fertility in Nigeria has been falling for decades, from about 6.4 births per woman in 1950 to roughly 4.2 today, and the projection has it near 2.7 by 2050. The population keeps rising anyway, for the same reason it does across most of the continent: age structure. About 52% of Nigerians were under twenty in the most recent age breakdown. Most of the parents of the 2040s and 2050s have already been born, so even a steep fall in births per woman produces a rising number of births for decades.

The dates make the point. Nigeria’s fertility rate does not drop below the 2.1 replacement level until around 2078 on this path, and its annual growth rate does not fall below one percent until about 2058. The dataset ends in 2100 with Nigeria still growing, one of 76 entries out of 237 that never peak inside the projection horizon at all. Whatever happens to Nigerian birth rates from here, the arithmetic of the next thirty years is largely settled.

The quietest input is mortality

Life expectancy at birth in Nigeria is about 55.0 years in 2026, the lowest of any country or territory in this dataset. The projection has it reaching roughly 64.7 by 2100. That improvement is not a side note to the growth story, it is part of it: a large share of the extra people in 2100 are there because fewer children and adults die, not because more are born.

It also means Nigeria’s projection carries unusual uncertainty on both sides. The UN publishes a low and a high fertility variant alongside the central one, and for Nigeria in 2100 they run from about 337 million to 658 million. That is a spread of some 321 million people, close to the entire current population of the United States, and the 4th widest band of any entry in the dataset, behind only India, China and Pakistan.

It is worth being exact about what that does and does not show. Measured against the size of the country it belongs to, the band is unremarkable: Nigeria ranks 44th of the 65 countries over 20 million on that basis, which is to say its projection is no more speculative in proportion than anyone else’s. It is wide in absolute terms because the country is large and young, so small differences in fertility compound over three generations across a very big base. The central number is the one everyone quotes; the band is the honest version.

What 477 million people would actually mean

Density gives the clearest sense of scale. Nigeria holds about 266 people per square kilometre today, 11th among the 65 countries over 20 million, and the central projection takes that to roughly 523 by 2100. Only two of those countries are that crowded today. Land does not grow. Everything else on the list, schools, clinics, power, water, housing, jobs for a workforce far larger than today’s, has to absorb the difference.

That is where projections stop being demography and start being politics, and where this site stops. The numbers on this page describe how many people the UN expects, on stated assumptions, not how well they will live. The demographic dividend that a young population can deliver is a possibility rather than a promise, and it depends on things no population model contains.

A caveat worth stating plainly: Nigeria’s figures rest on a thinner statistical base than most countries of comparable size, because its most recent full census is now many years old and the estimates lean on surveys and modelling instead. That affects the current level, not only the projection. All figures here are the UN World Population Prospects 2024 medium variant, processed as described in our methodology, with population read on 1 January of each year. A projection is a conditional statement about what follows from a set of assumptions, not a forecast.