United States is approximately 9,833,517 sq km, while New Caledonia is approximately 18,575 sq km, making New Caledonia 0.19% the size of United States. Meanwhile, the population of United States is ~332.6 million people (332.3 million fewer people live in New Caledonia).
This to-scale map shows a size comparison of United States compared to New Caledonia. For more details, see an in-depth quality of life comparison of New Caledonia vs. United States using our country comparison tool.