China is approximately 9,596,960 sq km, while New Caledonia is approximately 18,575 sq km, making New Caledonia 0.19% the size of China. Meanwhile, the population of China is ~1.4 billion people (1.4 billion fewer people live in New Caledonia).
This to-scale map shows a size comparison of China compared to New Caledonia. For more details, see an in-depth quality of life comparison of New Caledonia vs. China using our country comparison tool.