This world population chart is simplified for easy comprehension and memorability. The simplified data on the chart is always within the error bars of professional demographic conjectures. On this chart only a few fixed points need to be learned to be able to estimate world population from 70,000 BCE to 2025 CE. Observe that in 1000 BCE there were 100 million people on Earth, and the population doubled every thousand years from 5000 BCE to 1000 CE. Another observation covers the recent period from 1625 through 2025. The population in 1975 was 4 billion and doubles in fifty years both past and future, then doubles in double the time back through 1625.
The time from 1,000 AD to 1625 included the bubonic plague and the Mongol invasions, and those events brought many deaths, so that period had little population change. About 70,000 years ago the human population was between 1,000 and 10,000 people. Mt Toba super-volcano erupted in Indonesia, and caused a world-wide overcast of dust which killed food sources, and few people survived. Today’s population meter.
This chart helps you stay oriented to what humanity is as a species.