Australia is approximately 7,741,220 sq km, while Puerto Rico is approximately 9,104 sq km, making Puerto Rico 0.12% the size of Australia. Meanwhile, the population of Australia is ~25.5 million people (22.3 million fewer people live in Puerto Rico).
This to-scale map shows a size comparison of Australia compared to Puerto Rico. For more details, see an in-depth quality of life comparison of Puerto Rico vs. Australia using our country comparison tool.