Guinea-Bissau is about 3.4 times smaller than New York.

New York is approximately 122,283 sq km, while Guinea-Bissau is approximately 36,125 sq km, making Guinea-Bissau 29.54% the size of New York. Meanwhile, the population of New York is ~19.4 million people (17.4 million fewer people live in Guinea-Bissau).
Tip: This to-scale comparison of New York vs. Guinea-Bissau uses the Mercator projection, which distorts the size of regions near the poles.