How Many People Have Ever Lived on Earth?

An estimated 117 billion people have ever been born on Earth since the emergence of modern humans roughly 200,000 years ago. This figure comes from the Population Reference Bureau (PRB), which has maintained and updated this estimate since demographer Carl Haub first published it in 1995.

To put this in perspective: with about 8.2 billion people alive today, roughly 7% of all humans who have ever existed are alive right now. That is an astonishing ratio. For most of human history, the total number of living people was measured in the millions, not billions. The explosive population growth of the last 200 years means that a disproportionate share of all human births happened very recently in historical terms.

The estimate involves some uncertainty, especially for the earliest periods of human existence when there are no written records. But the PRB methodology is widely regarded as the most rigorous attempt to answer this question, and the 117 billion figure is the most commonly cited number in academic and popular sources.

How the estimate is calculated

The PRB divides human history into key periods and estimates the number of births in each one based on three factors: the estimated population at the start and end of each period, the average birth rate, and the length of the period. Here is a simplified breakdown:

• 190,000 BC to 50,000 BC: ~2 people initially, extremely slow growth, very high mortality. Estimated ~1 billion cumulative births over 140,000 years.
• 50,000 BC to 8000 BC: Hunter-gatherer era, population grew from a few thousand to ~5 million. ~5 billion births.
• 8000 BC to 1 AD: Agricultural revolution, population reached ~300 million. ~46 billion births.
• 1 AD to 1800: Population grew slowly from 300 million to 1 billion despite plagues, famines, and wars. ~30 billion births.
• 1800 to present: Industrial revolution, modern medicine, population exploded from 1 billion to 8.2 billion. ~35 billion births.

Why so many were born in ancient times

It may seem surprising that ~46 billion people were born between 8000 BC and 1 AD, when the population was only a few hundred million. The reason is that birth rates were extremely high (40-50 births per 1,000 people per year) and life expectancy was very low (averaging 20-30 years). People had many children because most died in infancy. Over thousands of years, these high birth rates accumulated to enormous totals.

The 7% myth and reality

A popular claim states that "more people are alive today than have ever died." This is false. About 109 billion people have died, compared to 8.2 billion alive today. However, the 7% figure is still remarkable. In 1900, only about 3% of all humans who had ever lived were alive. In 1800, it was about 2%. The proportion of the living to the total ever born has been rising rapidly.

Deadliest events in human history

Of the ~117 billion people who have ever lived, billions died from wars, pandemics, disasters, and atrocities. Here are some of the most significant events by death toll, each a reminder of the fragility of human life.

Wars and conflicts

• World War II (1939-1945): 70-85 million dead, the deadliest conflict in history. This includes ~20 million military deaths and ~40 million civilian deaths. The Soviet Union alone lost ~27 million people, China lost ~15-20 million.
• World War I (1914-1918): 15-22 million dead, including ~10 million military and ~7 million civilians. The 1918 Spanish Flu pandemic that followed killed an additional 50-100 million.
• Mongol Conquests (1206-1368): An estimated 30-40 million dead. Some historians estimate up to 10% of the world's population was killed during the Mongol invasions under Genghis Khan and his successors.
• Taiping Rebellion (1850-1864): 20-30 million dead. This Chinese civil war is one of the deadliest conflicts in history, yet remains relatively unknown in the West.
• Three Kingdoms War, China (184-280 AD): An estimated 36-40 million dead. China's population dropped from ~56 million to ~16 million during this period.
• American Civil War (1861-1865): ~620,000-750,000 dead. More Americans died in the Civil War than in all other American wars combined until Vietnam.

Genocides and atrocities

• The Holocaust (1941-1945): ~6 million Jews systematically murdered by Nazi Germany, along with ~5-6 million others including Roma, disabled people, political prisoners, and POWs. Total: ~11-12 million killed in the Nazi genocide programs.
• Holodomor, Ukraine (1932-1933): 3.5-7.5 million Ukrainians starved to death in a man-made famine engineered by Stalin's Soviet regime.
• Cambodian Genocide (1975-1979): 1.5-2 million killed by the Khmer Rouge, roughly 25% of Cambodia's entire population.
• Rwandan Genocide (1994): ~800,000 Tutsi and moderate Hutu killed in just 100 days, one of the fastest genocides in history.
• Armenian Genocide (1915-1923): 1-1.5 million Armenians killed by the Ottoman Empire.

Pandemics and disease

• Black Death / Bubonic Plague (1346-1353): 75-200 million dead. Killed 30-60% of Europe's population and took over 200 years for the population to recover.
• Spanish Flu (1918-1920): 50-100 million dead worldwide, infecting roughly one-third of the global population. More died from the flu than in World War I.
• COVID-19 (2020-2023): Officially ~7 million confirmed deaths worldwide, but excess mortality studies estimate the true toll at 15-25 million. The pandemic triggered the largest global disruption since World War II.
• HIV/AIDS (1981-present): ~40 million dead since the epidemic began. Sub-Saharan Africa was hardest hit, with some countries losing 10-20% of their adult population.
• Plague of Justinian (541-549 AD): 25-50 million dead, roughly half the population of the Byzantine Empire. It contributed to the fall of the Roman world.
• Smallpox (throughout history): An estimated 300-500 million deaths in the 20th century alone. Over all of human history, smallpox may have killed more people than any other disease. It was eradicated in 1980 through vaccination.

Nuclear attacks and disasters

• Hiroshima and Nagasaki (August 1945): Hiroshima: ~80,000 killed instantly, ~140,000 dead by end of 1945. Nagasaki: ~40,000 killed instantly, ~70,000 dead by end of 1945. Combined: ~210,000 deaths. Tens of thousands more died in subsequent years from radiation sickness and cancer. These remain the only use of nuclear weapons in warfare.
• Chernobyl disaster (April 26, 1986): 31 people died directly from the explosion and acute radiation syndrome. The long-term death toll is heavily debated: the WHO estimates ~4,000 eventual cancer deaths; other studies suggest 16,000-60,000. Over 350,000 people were permanently evacuated. A 2,600 km² exclusion zone remains uninhabitable.
• Fukushima disaster (March 11, 2011): 1 confirmed death from radiation (lung cancer, 2018). However, the earthquake and tsunami that caused the meltdown killed ~18,500 people. Over 154,000 were evacuated.

Terrorist attacks

• September 11, 2001 (9/11): 2,977 victims killed when 19 hijackers crashed four planes into the World Trade Center, Pentagon, and a field in Pennsylvania. An additional 25,000+ people have since developed illnesses from Ground Zero exposure. The deadliest terrorist attack in history.
• 2004 Madrid train bombings: 193 killed, ~2,000 injured.
• 2008 Mumbai attacks: 175 killed over a 4-day siege across the city.

Natural disasters

• 1931 China floods: 1-4 million dead, the deadliest natural disaster in recorded history.
• 1556 Shaanxi earthquake, China: ~830,000 dead, the deadliest earthquake ever recorded.
• 2010 Haiti earthquake: 100,000-316,000 dead.
• 2004 Indian Ocean tsunami: ~230,000 dead across 14 countries.
• 1970 Bhola cyclone, Bangladesh: 300,000-500,000 dead.
• 79 AD eruption of Mount Vesuvius: ~2,000 dead. Buried the cities of Pompeii and Herculaneum, preserving them for modern archaeology.
• Titanic sinking (April 15, 1912): 1,517 dead out of 2,224 passengers and crew. At the time, the worst peacetime maritime disaster. The ship sank in under 3 hours after striking an iceberg on its maiden voyage.

Famines

• Great Chinese Famine (1959-1961): 15-55 million dead, caused by Mao's Great Leap Forward policies. The deadliest famine in human history.
• Bengal Famine of 1943: 2-3 million dead in British-ruled India.
• Irish Potato Famine (1845-1852): ~1 million dead, another 1 million emigrated. Ireland's population dropped by 25%.
• North Korean famine (1994-1998): 240,000-3.5 million dead (estimates vary widely).

Putting it in perspective

World War II alone killed roughly 0.07% of all humans who have ever lived. The Black Death killed an estimated 0.1-0.2%. Smallpox, over centuries, may have killed 0.5% or more. These numbers seem small as percentages, but they represent unimaginable human suffering.

Today, the world is statistically safer than at any point in human history. The chance of dying from violence, famine, or disease is lower than ever before. Global life expectancy has risen from ~30 years in 1800 to ~73 years today. But history reminds us how quickly that progress can be undone.

Timeline of world population milestones

• 190,000 BC: First Homo sapiens in Africa
• 10,000 BC: ~5 million people (start of agriculture)
• 1 AD: ~300 million
• 1350 AD: ~370 million (Black Death kills 30-60%)
• 1800: 1 billion
• 1927: 2 billion
• 1960: 3 billion
• 1974: 4 billion
• 1987: 5 billion
• 1999: 6 billion
• 2011: 7 billion
• 2022: 8 billion

💀 About 7% of All Humans Who Ever Lived Are Alive Right Now

With 8.2 billion people alive today out of an estimated 117 billion total, about 7% of all humans who have ever existed are currently living. This percentage has been rising steadily and is the highest it has ever been. In 1900, it was about 4%. In 1 AD, it was roughly 1.5%. The sheer scale of modern population growth means that a disproportionate share of all human experience is happening right now, in our lifetimes.