United Kingdom is approximately 243,610 sq km, while Grenada is approximately 344 sq km, making Grenada 0.14% the size of United Kingdom. Meanwhile, the population of United Kingdom is ~65.8 million people (65.6 million fewer people live in Grenada).
This to-scale map shows a size comparison of United Kingdom compared to Grenada. For more details, see an in-depth quality of life comparison of Grenada vs. United Kingdom using our country comparison tool.