As per International Monetary Fund (IMF) 2019 estimates, the GDP (nominal) of Belgium is USD 517,609 million. This GDP (nominal) is around 0.59% of Entire World’s GDP. Currently (2019), the world rank of Belgium is 24 in terms of GDP Nominal.
However, as per 2018 estimates by World Bank, the GDP (Nominal) of Belgium is USD 531,767 million. As per World Bank Estimates, the global rank of Belgium is 23.

Belgium GDP [PPP]

On the other hand, as per 2019 estimates by International Monetary Fund, the GDP (PPP) of Belgium is USD 567,488 Million. This is 0.40% of World. Belgium on this basis has a global rank of 37.