United Kingdom is approximately 243,610 sq km, while Tajikistan is approximately 144,100 sq km, making Tajikistan 59.15% the size of United Kingdom. Meanwhile, the population of United Kingdom is ~65.8 million people (56.9 million fewer people live in Tajikistan).
This to-scale map shows a size comparison of United Kingdom compared to Tajikistan. For more details, see an in-depth quality of life comparison of Tajikistan vs. United Kingdom using our country comparison tool.