China is approximately 9,596,960 sq km, while Burma is approximately 676,578 sq km, making Burma 7.05% the size of China. Meanwhile, the population of China is ~1.4 billion people (1.3 billion fewer people live in Burma).
This to-scale map shows a size comparison of China compared to Burma. For more details, see an in-depth quality of life comparison of Burma vs. China using our country comparison tool.