China is approximately 9,596,960 sq km, while Denmark is approximately 43,094 sq km, making Denmark 0.45% the size of China. Meanwhile, the population of China is ~1.4 billion people (1.4 billion fewer people live in Denmark).
This to-scale map shows a size comparison of China compared to Denmark. For more details, see an in-depth quality of life comparison of Denmark vs. China using our country comparison tool.