Chad is about 4.1 times bigger than New Mexico.

New Mexico is approximately 314,310 sq km, while Chad is approximately 1,284,000 sq km, making Chad 309% larger than New Mexico. Meanwhile, the population of New Mexico is ~2.1 million people (15.9 million more people live in Chad).
Tip: This to-scale comparison of New Mexico vs. Chad uses the Mercator projection, which distorts the size of regions near the poles.