United Kingdom is approximately 243,610 sq km, while Nepal is approximately 147,181 sq km, making Nepal 60.42% the size of United Kingdom. Meanwhile, the population of United Kingdom is ~65.8 million people (35.4 million fewer people live in Nepal).
This to-scale map shows a size comparison of United Kingdom compared to Nepal. For more details, see an in-depth quality of life comparison of Nepal vs. United Kingdom using our country comparison tool.