9.44 Billion

Update, January, 2024:

As of December 31, 2023, at midnight CET the population on our planet was exactly 9,446,218,012.

Update, January, 2023:

As of December 31, 2022, at midnight CET the population on our planet was exactly 9,339,174,098.

Update, January 2022:

As of December 31, 2021, at midnight CET the population on our planet was exactly 9,248,028,002.
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Original post:

As of December 31, 2019, at midnight CET the population on our planet was exactly 9,060,794,141 or an increase of 106,942,723 over the past year!

source: https://ca.figu.org/overpopulation-statistics.html

related: https://billymeier.files.wordpress.com/2015/11/destruction-of-the-environment-as-the-consequence-of-overpopulation.pdf