New Caledonia is approximately 18,575 sq km, while Thailand is approximately 513,120 sq km, making Thailand 2,662% larger than New Caledonia. Meanwhile, the population of New Caledonia is ~290,009 people (68.7 million more people live in Thailand).
This to-scale map shows a size comparison of New Caledonia compared to Thailand. For more details, see an in-depth quality of life comparison of Thailand vs. New Caledonia using our country comparison tool.