Gibraltar is about 48,355 times smaller than New Mexico.

New Mexico is approximately 314,310 sq km, while Gibraltar is approximately 7 sq km, making Gibraltar 0.0% the size of New Mexico. Meanwhile, the population of New Mexico is ~2.1 million people (2.0 million fewer people live in Gibraltar).
Tip: This to-scale comparison of New Mexico vs. Gibraltar uses the Mercator projection, which distorts the size of regions near the poles.