Historical trajectory and interval velocity analysis from 1000 CE (275M) to 2026 (8.3B)
In 1804, humanity reached its first 1 billion people after hundreds of thousands of years. It took 126 years to reach 2 billion in 1930. The interval to add 1 billion people compressed rapidly to 30 years (3B in 1960), 14 years (4B in 1974), and hit an all-time fastest rate of just 11 years between 1987 and 1998 (5B to 6B).
| Year | Population | Total Billions | Interval Added | Years Elapsed | Annual Growth Rate | Acceleration Status |
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