Tanzania is about 41 times bigger than New Hampshire.

New Hampshire is approximately 23,227 sq km, while Tanzania is approximately 947,300 sq km, making Tanzania 3,978% larger than New Hampshire. Meanwhile, the population of New Hampshire is ~1.3 million people (62.5 million more people live in Tanzania).
Tip: This to-scale comparison of New Hampshire vs. Tanzania uses the Mercator projection, which distorts the size of regions near the poles.