India surpasses China as the world's most populous country
In April 2023 the United Nations confirmed that India had overtaken China as the world's most populous country, ending more than 70 continuous years of Chinese demographic leadership. With approximately 1.429 billion people against China's 1.426 billion, the gap is narrow — but the trajectories diverge sharply from here.
How the crossing happened
China held the top position throughout the 20th century, but its demographic engine began to slow sharply as a direct result of the one-child policy introduced in 1980. Enforced across most of the country until 2015, the policy drove China's total fertility rate to some of the lowest levels in the world. By the time the policy was relaxed and then abolished, the resulting age structure — too few young workers, too many approaching retirement — was already locked in.
India, by contrast, completed its fertility transition more gradually and later. Its TFR fell from around 5.9 in 1960 to approximately 2.0 by 2021, according to World Bank fertility data. The decline was real and substantial, but it still left India with a younger, faster-growing population than China's at the moment of crossing.
China's demographic turning point
China's population peaked and began declining in 2022 — the first decline since the famine years of the early 1960s. The National Bureau of Statistics of China reported 850,000 fewer people at end-2022 than end-2021. The TFR in 2022 was estimated at around 1.09, among the lowest ever recorded for a large country. Births fell to 9.56 million — the lowest since records began in 1949.
The working-age population (15–59) has been shrinking since 2011. By the 2040s, China will face an old-age dependency ratio comparable to Japan's today — the most acute ageing challenge in history in terms of absolute numbers. The UN WPP 2024 projects China's population falling to approximately 800 million by 2100 under the medium scenario.
India's demographic window
India's current age structure offers a potential demographic dividend — a period when the working-age share is unusually large relative to dependents. With a median age of approximately 28 and roughly two-thirds of the population of working age, India has a productive window that most economists estimate will last until the 2040s. Whether India capitalises on it depends heavily on job creation, female labour force participation, and skill development. The ILO India office tracks these labour market metrics regularly.
India's population will continue growing for several more decades before peaking, projected by the UN at around 1.7 billion in the 2060s. Regional variation within India is extreme: southern states like Tamil Nadu and Kerala have TFRs around 1.7, while Bihar and Uttar Pradesh remain above 3.0, according to India's Ministry of Health and Family Welfare survey data.
What the shift means geopolitically and economically
Population size is not economic power — but it shapes the scale of domestic markets, labour supply, and military potential over the long run. India is now the world's most populous country and the fifth-largest economy; by most projections it will become the third-largest economy by the 2030s. The IMF World Economic Outlook projects India as one of the fastest-growing major economies through mid-century.
China's peak and decline, meanwhile, will reshape global supply chains, demographic assumptions built into climate models, and international institutions calibrated around a still-growing China. Our World in Data's future population projections visualise the full divergence between India and China through 2100.
Frequently asked questions
When did India overtake China in population?
The UN estimated the crossing occurred in April 2023, with India at approximately 1.429 billion and China at 1.426 billion. The exact date is a statistical estimate based on projection models, not a real-time count.
Why is China's population declining?
Decades of the one-child policy (1980–2015) drove China's TFR to around 1.09 in 2022 — well below the 2.1 replacement level. The NBS China confirmed the first annual population decline since the 1960s in January 2023.
Will India's population keep growing?
Yes, but growth is slowing. India's TFR is now around 2.0, near replacement. The UN projects India's population peaking at ~1.7 billion in the 2060s before stabilising.
How does India's age structure compare to China's?
India's median age is approximately 28, versus China's 38. India's population pyramid is still relatively broad-based; China's has already shifted toward a rectangular and increasingly top-heavy shape. This is the central demographic difference driving their divergent economic trajectories over the next 30 years.