As per International Monetary Fund (IMF) 2019 estimates, the GDP (nominal) of Niger is USD 9,724 million. This GDP (nominal) is around 0.01% of Entire World’s GDP. Currently (2019), the world rank of Niger is 140 in terms of GDP Nominal.
However, as per 2018 estimates by World Bank, the GDP (Nominal) of Niger is USD 9,240 million. As per World Bank Estimates, the global rank of Niger is 139.

Niger GDP [PPP]

On the other hand, as per 2019 estimates by International Monetary Fund, the GDP (PPP) of Niger is USD 25,780 Million. This is 0.02% of World. Niger on this basis has a global rank of 137.