Delaware is about 4.6 times smaller than New Hampshire.

New Hampshire is approximately 23,227 sq km, while Delaware is approximately 5,060 sq km, making Delaware 21.78% the size of New Hampshire. Meanwhile, the population of New Hampshire is ~1.3 million people (418,536 fewer people live in Delaware).
Tip: This to-scale comparison of New Hampshire vs. Delaware uses the Mercator projection, which distorts the size of regions near the poles.