Today, the population of humans on Earth has crossed 8 billion officially.

1 Billion 1804
2 Billion 1927
3 Billion 1960
4 Billion 1974
5 Billion 1987
6 Billion 1998
7 Billion 2010
8 Billion 2022
9 Billion 2037 (estimated)
10 Billion 2058 (estimated)

It is estimated that 10.4 Billion will be the peak population we reach around 2080, after that population should decrease.