The Growth of Population in India: Key Phases and Trends

India’s population story is one of the most dramatic demographic journeys in human history. From a land repeatedly ravaged by famines, plagues, and influenza to becoming the most populous country in the world in April 2023, the trajectory tells us as much about politics, public health, and policy as it does about people. Understanding how this growth unfolded – and why it slowed – is essential for making sense of where the country is headed next.

Early population dynamics (1800-1950): A long age of stagnation 🔗

For much of the nineteenth and early twentieth centuries, India’s population grew slowly, unevenly, and sometimes not at all. Birth rates were extremely high – often above 45 per 1,000 – but death rates were nearly as high. Demographers call this the “high stationary stage” of demographic transition: a regime in which large families simply replaced lives lost to disease, hunger, and conflict.

The toll of famines, epidemics, and war 🔗

The colonial period was punctuated by catastrophic mortality events. The Great Famine of 1876-78 and later the Bengal Famine of 1943 each killed millions. Endemic diseases like cholera, malaria, smallpox, and plague were constant threats, and public health infrastructure under the British administration was thin and unevenly distributed. Crude death rates hovered between 40 and 50 per 1,000 in the late nineteenth century – figures that look unimaginable today.

The single most devastating event of this era was the 1918 influenza pandemic, sometimes called the Bombay Fever. Historians estimate that 12 to 18 million Indians died between September and December 1918 alone – the fastest mass mortality event in the country’s recorded history. The pandemic struck a population already weakened by war-time food shortages, hitting low-caste and tribal communities hardest because of crowded housing, poor nutrition, and minimal medical access.

The “Great Divide” of 1921 🔗

The 1921 census recorded something that had never happened before and has not happened since: India’s population actually declined. The decade 1911-1921 showed a negative growth rate of about −0.31 per cent, almost entirely because of the influenza catastrophe layered onto endemic disease and famine. This single data point gave the year its lasting name – the Year of the Great Demographic Divide.

Why is 1921 such a turning point? Because everything that came after it looked different. From 1921 to 1951, India entered what scholars call the “Phase of Steady Growth.” Death rates began to fall as transport improved, famine relief became more systematic, and basic public health measures like vaccination and sanitation slowly spread. Birth rates, however, stayed stubbornly high. The result: the population grew from roughly 251 million in 1921 to about 361 million by 1951 – the beginning of a long climb that would soon become an explosion.

Rapid growth (1951-1981): The population explosion 🔗

Independence in 1947 set the stage for the most dramatic demographic phase in Indian history. Between 1951 and 1981, the population nearly doubled – from 361 million to 683 million, an 89 per cent increase in just three decades. The annual growth rate peaked at around 2.2 per cent in the 1970s, meaning the population was doubling roughly every 30 years.

What drove the explosion 🔗

This was the classic “late expanding” stage of demographic transition: mortality fell sharply while fertility lagged behind. Several developments converged to produce it.

Mortality decline: Death rates dropped from about 27 per 1,000 in 1951 to roughly 15 per 1,000 by 1981. Life expectancy at birth nearly doubled, climbing from around 32 years to 54 years. Mass immunisation, antibiotics, malaria control programmes, and the spread of primary healthcare all played a part.

Better food security: The Green Revolution from the mid-1960s onwards dramatically increased the yield of wheat and rice, reducing the threat of large-scale famine that had shadowed previous generations.

Persistent fertility: Birth rates declined only modestly, from about 40 per 1,000 in 1951 to 33 per 1,000 in 1981. A mix of social factors kept fertility high – strong son preference, early marriage, low female literacy, the economic value of children as agricultural labour and old-age security, and limited contraceptive availability.

Family planning and international pressure 🔗

India was actually the first country in the world to launch an official national family planning programme, in 1952. The early decades of this programme, however, struggled. Initial approaches relied on the rhythm method and clinic-based education with limited reach. Through the 1960s, as global anxiety about a “population bomb” intensified, international agencies like the Ford Foundation, the World Bank, and UN bodies pressed India to adopt aggressive family planning targets, often tied to development aid.

The most controversial chapter came during the Emergency of 1975-77, when coercive sterilisation drives – particularly targeting poor men – generated lasting public distrust of state-led family planning. Many demographers argue that this episode set Indian family planning back by years, because subsequent governments became politically wary of pushing strong fertility-control messaging.

Recent trends (1981-present): Slowing growth and population momentum 🔗

Since 1981, India has been in the fourth phase of its demographic transition – high growth with clear signs of slowing down. The population continued to climb from 683 million in 1981 to 1.21 billion at the 2011 Census, but the rate of growth steadily decelerated. The decadal growth rate fell from 21.5 per cent during 1991-2001 to 17.7 per cent during 2001-2011.

Fertility decline and replacement-level fertility 🔗

The most important shift has been in fertility. India’s Total Fertility Rate (TFR) – the average number of children a woman bears in her lifetime – has collapsed from 5.9 in 1951 to roughly 2.0 in 2021, slipping just below the replacement level of 2.1. This is one of the fastest fertility declines among large countries. Drivers include rising female education, later marriage, increasing urbanisation, the wider availability of contraception, and changing aspirations about family size.

The decline is uneven, though. States like Kerala and Tamil Nadu reached replacement-level fertility decades ago, while Bihar still records a TFR around 3.0. This regional variation will shape Indian politics for years to come, particularly around the contentious question of constituency delimitation, which currently uses 1971 population data to avoid penalising states that successfully controlled their populations.

Why the population is still growing: Population momentum 🔗

Here is an important paradox. Even though fertility has dropped below replacement, India’s population is still growing and is projected to peak at around 1.7 billion in the early 2060s. How is that possible?

The answer is population momentum. Decades of high fertility in the past produced an enormous cohort of young people who are now in their reproductive years. Even if each woman is having fewer children, there are simply many more women bearing children than ever before. The base is so large that the population continues to expand for several decades after fertility falls. Think of a freight train: even after the engine cuts power, the train rolls forward for a long time before stopping.

The missing 2021 census and the COVID-19 disruption 🔗

India is currently navigating a major data gap. The 2021 Census, which should have produced the most up-to-date official population figures, was postponed indefinitely because of the COVID-19 pandemic. As of 2026, the decennial exercise has still not been completed, with the next census now expected to be released by March 2027.

This is more than a statistical inconvenience. India’s flagship welfare schemes – including the Public Distribution System under the National Food Security Act – still rely on 2011 census data to determine beneficiary coverage. Researchers estimate that more than 10 crore people may have been left out of subsidised food entitlements because allocations are based on outdated population counts. Planning for schools, hospitals, urban infrastructure, and electoral constituencies all hinges on accurate, recent enumeration.

The COVID-19 pandemic itself caused significant excess mortality in India during 2020-21, though the exact toll remains debated. Beyond mortality, the pandemic accelerated several demographic shifts already underway, including reverse migration from cities to villages and disruptions to schooling that may have long-term fertility effects.

The road ahead 🔗

India today is a country of demographic contrasts. It is the world’s most populous nation, having overtaken China in April 2023, yet its fertility rate is now below replacement. It still has a young median age of around 29 years and a potential “demographic dividend” through 2050, yet it also has rapidly ageing pockets in southern and western states. The country that once feared a population bomb is beginning to wonder what an ageing, eventually shrinking population will look like.

The phases – stagnation, steady growth, explosion, deceleration – are not just academic categories. Each one carries the imprint of specific historical forces: colonial neglect, pandemics and famines, post-Independence public health gains, the politics of family planning, and now the long quiet revolution of falling fertility.

What do you think? If India’s population is projected to peak and then decline within your lifetime, what policy priorities should the country focus on now – boosting human capital for a working-age boom, or preparing for an ageing society? And how should the long delay in the 2021 Census shape your trust in the population estimates we currently use?

References

1. https://en.wikipedia.org/wiki/1918_flu_pandemic_in_India
2. https://www.gatewayhouse.in/1918-flu-india/
3. https://ijrar.com/upload_issue/ijrar_issue_518.pdf
4. https://sustainability.shiksha/population-health-sustainability/india-demographic-trends-population-growth/
5. https://www.populationfoundation.in/wp-content/uploads/2021/07/Population-growth-Fertility_abridged-from-approved-note.pdf
6. https://www.clearias.com/census/
7. https://houseofupsc.com/indias-population-reaches-146-39-crore/
8. https://www.dataforindia.com/population-growth/
9. https://en.wikipedia.org/wiki/Demographics_of_India