Michigan is about 13 times bigger than New Caledonia.

New Caledonia is approximately 18,575 sq km, while Michigan is approximately 250,493 sq km, making Michigan 1,249% larger than New Caledonia. Meanwhile, the population of New Caledonia is ~297,160 people (9.6 million more people live in Michigan).
Tip: This to-scale comparison of New Caledonia vs. Michigan uses the Mercator projection, which distorts the size of regions near the poles.