World population reaches 8 billion
On 15 November 2022 the United Nations symbolically designated the crossing of 8 billion people alive on Earth. It took only 11 years to add the most recent billion — yet in another sense, it is already slowing down.
How we got here
The journey from 1 billion to 8 billion spans roughly 200 years, but it was not a steady climb. The first billion took all of recorded history up to around 1804. The second arrived by 1927 — a 123-year gap. By the time humanity crossed 7 billion in 2011, each additional billion was taking roughly a decade. Our World in Data charts the full arc of population growth from pre-industrial levels to the present.
The engine behind this acceleration was not rising birth rates — it was falling death rates. Vaccines, clean water, antibiotics, and improved food systems all drove infant and child mortality down dramatically over the 20th century. Births stayed high for a generation after deaths fell, producing the rapid growth that defines the post-war decades. Gapminder's births and deaths visualisation illustrates this demographic divergence by country and decade.
The growth is already slowing
The global population growth rate peaked at around 2.1% per year in 1963. By 2022 it had fallen below 1% — the slowest rate since World War II. The number of people added each year is still large in absolute terms, but the share is shrinking. This is the classic pattern of the demographic transition: mortality falls first, then fertility follows.
Sub-Saharan Africa is now the primary driver of global growth, with a total fertility rate still averaging around 4.5 children per woman. By contrast, Europe, East Asia, and parts of Latin America are well below replacement level (2.1), meaning those populations would shrink without immigration. The UN World Population Prospects 2024 provides country-by-country projections under multiple fertility scenarios.
Where the growth is concentrated
More than half of the projected growth between now and 2050 is expected to come from just eight countries: the Democratic Republic of Congo, Egypt, Ethiopia, India, Nigeria, Pakistan, the Philippines, and Tanzania. India surpassed China as the world's most populous country in 2023 — a shift the UN confirmed in April 2023.
Meanwhile, 61 countries are projected to see their populations fall by at least 1% by 2050 due to sustained low fertility and outmigration. For an interactive look at how different countries' population curves diverge, the PopulationTheGuide explorer lets you compare ridgeline lanes side by side on a single canvas.
What comes next
The UN's median scenario projects the 9 billion mark arriving around 2037, a 15-year gap versus 11 for the last billion — the first time the interval has lengthened since the early 20th century. Peak population of roughly 10.4 billion is expected in the 2080s. A 2024 Lancet study using alternative fertility models puts the peak lower and earlier, around 9.7 billion before 2060, reflecting faster-than-expected fertility decline in several major countries.
Whether population peaks at 9 billion or 11 billion depends mostly on how quickly fertility falls in high-fertility regions — and that is driven by access to education for women, healthcare, and economic opportunity. The projection (medium variant) glossary entry explains how the UN builds its central scenario.
Frequently asked questions
When did the world population reach 8 billion?
The United Nations estimated the global population crossed 8 billion on 15 November 2022, symbolically designated the Day of Eight Billion. The date is a projection-based estimate, not an exact count.
How long did it take to go from 7 to 8 billion?
Approximately 11 years — 7 billion was passed in October 2011. Each successive billion has taken roughly a decade, though the gap is now beginning to widen as fertility continues to fall globally.
When will world population peak?
Under the UN median variant, the global population is projected to peak at around 10.4 billion in the 2080s. Under lower-fertility scenarios, the peak could come earlier and lower — see the UN WPP 2024 projections for full scenario details.
Which country has the most people?
India surpassed China as the world's most populous country in 2023, with an estimated 1.43 billion people. China's population is now declining due to decades of low fertility following the one-child policy era. India's population is projected to continue growing until the 2060s.