Country size comparison
compared to
Australia is about 1,343 times bigger than Brunei.
Brunei is approximately 5,765 sq km, while Australia is approximately 7,741,220 sq km, making Australia 134,180% larger than Brunei. Meanwhile, the population of Brunei is ~478,054 people (25.7 million more people live in Australia).
Compare further: Australia vs. Brunei