As per International Monetary Fund (IMF) 2019 estimates, the GDP (nominal) of Australia is USD 1,376,255 million. This GDP (nominal) is around 1.58% of Entire World’s GDP. Currently (2019), the world rank of Australia is 14 in terms of GDP Nominal.
However, as per 2018 estimates by World Bank, the GDP (Nominal) of Australia is USD 1,432,195 million. As per World Bank Estimates, the global rank of Australia is 13.

Australia GDP [PPP]

On the other hand, as per 2019 estimates by International Monetary Fund, the GDP (PPP) of Australia is USD 1,364,835 Million. This is 0.96% of World. Australia on this basis has a global rank of 21.