Thailand is approximately 513,120 sq km, while New Caledonia is approximately 18,575 sq km, making New Caledonia 3.62% the size of Thailand. Meanwhile, the population of Thailand is ~69.0 million people (68.7 million fewer people live in New Caledonia).
This to-scale map shows a size comparison of Thailand compared to New Caledonia. For more details, see an in-depth quality of life comparison of New Caledonia vs. Thailand using our country comparison tool.