China is approximately 9,596,960 sq km, while United States is approximately 9,833,517 sq km, making United States 2% larger than China. Meanwhile, the population of China is ~1.4 billion people (1.1 billion fewer people live in United States).
This to-scale map shows a size comparison of China compared to United States. For more details, see an in-depth quality of life comparison of United States vs. China using our country comparison tool.