As per International Monetary Fund (IMF) 2019 estimates, the GDP (nominal) of São Tomé and Príncipe is USD 477 million. Currently (2019), the world rank of São Tomé and Príncipe is 181 in terms of GDP Nominal.
However, as per 2018 estimates by World Bank, the GDP (Nominal) of Sao Tome and Principe is USD 422 million. As per World Bank Estimates, the global rank of Sao Tome and Principe is 179.

São Tomé and Príncipe GDP [PPP]

On the other hand, as per 2019 estimates by International Monetary Fund, the GDP (PPP) of São Tomé and Príncipe is USD 753 Million.  São Tomé and Príncipe on this basis has a global rank of 180.