As per International Monetary Fund (IMF) 2019 estimates, the GDP (nominal) of Tuvalu is USD 49 million. Currently (2019), the world rank of Tuvalu is 186 in terms of GDP Nominal.
However, as per 2018 estimates by World Bank, the GDP (Nominal) of Tuvalu is USD 43 million. As per World Bank Estimates, the global rank of Tuvalu is 185.

Tuvalu GDP [PPP]

On the other hand, as per 2019 estimates by International Monetary Fund, the GDP (PPP) of Tuvalu is USD 47 Million.  Tuvalu on this basis has a global rank of 187.