Cambodia is approximately 181,035 sq km, while Hong Kong is approximately 1,108 sq km, making Hong Kong 0.61% the size of Cambodia. Meanwhile, the population of Cambodia is ~16.9 million people (9.7 million fewer people live in Hong Kong).
This to-scale map shows a size comparison of Cambodia compared to Hong Kong. For more details, see an in-depth quality of life comparison of Hong Kong vs. Cambodia using our country comparison tool.