Between 2025 and 2050 the world's population grows by about 1.4 billion people. Almost all of the net increase happens in sub-Saharan Africa. Almost everywhere else, the line starts bending the other way.
Between 2025 and 2050 the world's population grows by about 1.4 billion people. Almost all of the net increase happens in sub-Saharan Africa. Almost everywhere else, the line starts bending the other way.
Population maps tend to read as a patchwork. This one does not.
A single contiguous band — from Senegal on the Atlantic through the Sahel, across the Horn of Africa, and south through Central Africa to Angola and Mozambique — will add people faster than anywhere else on Earth. The countries not in that band are mostly flat, and a growing list of them are shrinking.
The ten fastest-growing national populations over the next twenty-five years are all in sub-Saharan Africa. Not mostly. All.
The Democratic Republic of Congo leads at +93 percent. The Central African Republic, Angola, Somalia, and Niger each add between 88 and 92 percent to their current populations. A decade ago this would have been forecast cautiously; in the 2024 UN revision it is the base case.
Niger, Chad, Mali, Burkina Faso, and Mauritania sit adjacent on the map and cluster together on the chart. Each is projected to grow by more than 55 percent by 2050; Niger and Chad by close to 90.
These are countries where the fertility transition — the slow shift from large families to small ones that has happened almost everywhere else — has barely started. Water stress, food security, and the movement of people north toward the Mediterranean will all be downstream of the line this chart draws.
Strip out the growers and a different map appears.
Forty-five countries are projected to have fewer people in 2050 than in 2025. Most are in Eastern Europe, East Asia, and the Caribbean. The list includes some of the world's richest economies and some of its poorest.
China contracts by 11 percent over the quarter-century — roughly 155 million fewer people by 2050 than today. India grows by nearly 15 percent and overtakes China permanently somewhere around 2023, widening the gap every year after.
The handoff is the largest single demographic transition in modern history, and it has already happened. The chart is just its working out.
Italy (-12%), Greece (-11%), Spain (-6%), and Portugal (-6%) all shrink by the middle of the century. In each, below-replacement fertility has run long enough that the echo in the twenty-something cohort of 2050 is already smaller than the forty-something cohort of 2025.
Southern Europe is where the demographic story of the twentieth century — industrialisation, urbanisation, smaller families — finally meets its arithmetic.
Ukraine leads the decline at -18 percent; Moldova at -22; Bulgaria at -20; Lithuania and Latvia near -20. Bosnia and Herzegovina, at -22, is the sharpest faller in the Balkans.
Wartime displacement explains some of Ukraine's trajectory. The rest — Soviet-era fertility collapse, outmigration to EU labour markets, a thin twenty-something generation feeding an even thinner one — is structural.
Japan's 2050 population, at -15 percent, is projected to be about 104 million — a number it last hit in 1967. South Korea falls 13 percent; Taiwan, on a parallel path the UN data does not separately list, further.
What makes the East Asian case distinctive is not the shape but the speed: a compressed demographic transition, low fertility locked in for a generation, and no meaningful inward migration to cushion the glide.
Projected change reshuffles the list of largest countries. India, first. China, second and falling. The United States holds third with modest growth (+10%). Then Nigeria, Pakistan, Indonesia — and, in this revision, the Democratic Republic of the Congo climbs into the top ten.
By 2050, five of the world's ten most populous countries sit on the African continent or its near periphery. In 1950 there were none.
"Medium fertility" is a scenario, not a forecast. The UN publishes high and low variants around it; sub-Saharan African fertility in particular is sensitive to assumptions that changed markedly between the 2022 and 2024 revisions.
A faster African fertility decline would narrow the bars on the left of the growth chart. A slower one would widen them. Migration — not modelled inside national totals here — would redistribute the totals without changing the sum.
The medium line is the one governments plan against. It is also the one that is most likely to be wrong by the time it arrives.
Demography is the part of the future that is already here. The children who will be working adults in 2050 have mostly been born. The grandparents who will be dying by then are already old.
The map on this page is, in that narrow sense, unusually honest. It is not a prediction about technology, politics, or war. It is arithmetic on cohorts that already exist — and arithmetic, played out over a generation, is what builds and unbuilds nations.
Data is drawn from the United Nations World Population Prospects 2024 Revision, medium-fertility variant, accessed at population.un.org/wpp in April 2026.
"Population change" is computed as the percentage difference between projected 2050 population and estimated 2025 population. The medium variant assumes a gradual convergence of fertility and mortality trends; the UN also publishes high- and low-fertility variants that bracket this projection.
National totals used in choropleth and chart views reflect de facto population within present national borders; migration is implicit in national totals but not separately modelled here. Small island states and micro-states with populations under one million are included in the dataset but not separately discussed.
This is an editorial framing of a published dataset. Figures are reproduced as cited; the argument about what the projection implies is the author's.