United Kingdom is approximately 243,610 sq km, while Austria is approximately 83,871 sq km, making Austria 34.43% the size of United Kingdom. Meanwhile, the population of United Kingdom is ~65.8 million people (56.9 million fewer people live in Austria).
This to-scale map shows a size comparison of United Kingdom compared to Austria. For more details, see an in-depth quality of life comparison of Austria vs. United Kingdom using our country comparison tool.