World population milestones

Estimated (to 2011) and projected (from 2012) populations of the world and its inhabited continents. The shaded regions correspond to range of projections by the United Nations Department of Economic and Social Affairs.

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
  • 2 billion in 1927
  • 3 billion in 1960
  • 4 billion in 1974
  • 5 billion in 1987
  • 6 billion in 1999
  • 7 billion in 2011
  • 8 billion in 2022

Old estimates put the global population at:

  • 9 billion by 2037–2043, 15 years after 8 billion
  • 10 billion by 2056–2074, 19 years after 9 billion; however, these milestones are likely to be reached far sooner. Projected figures vary depending on underlying statistical assumptions and which variables are manipulated in projection calculations, especially the fertility variable. Long-range predictions to the year 2150 (more than a century from now) are uncertain and range from a low of 3 billion to a high of 25 billion.
World population milestones in billions (UN estimates)
Population 12345678910
Year 1804192719601974198719992011202220372056
Years elapsed -1233314131212111519
World population milestones in billions (USCB estimates)
Population 12345678910
Year 1804192719601974198719992011202220432074
Years elapsed -1233314131212112131
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