World population milestones

World population milestones went unnoticed until the 20th century, since there was no reliable data on global population dynamics. The population of the world reached: 1 billion in 1804 (994,234,545) 2 billion in 1927 (1,998,342,567) 3 billion in 1960 (2,997,567,890) 4 billion in 1975 (3,990,234,567) 5 billion in 1987 (4,988,234,567) 6 billion in 1999 (5,980,247,450) 7 billion in 2011 (6,990,234,567) 8 billion in 2022 (7,990,245,666) 9 billion by 2037–2043 (8,999,245,456)(estimate), 15 years after 8 billion 10 billion by 2056–2074 9,999,899,234(estimate), 19 years after 9 billion finals However, these milestones are likely to be reached far sooner.

Source: Wikipedia — World population milestones (CC BY-SA 4.0)