Samoa is about 51 times smaller than Iowa.

Iowa is approximately 144,701 sq km, while Samoa is approximately 2,831 sq km, making Samoa 1.96% the size of Iowa. Meanwhile, the population of Iowa is ~3.0 million people (2.8 million fewer people live in Samoa).
Tip: This to-scale comparison of Iowa vs. Samoa uses the Mercator projection, which distorts the size of regions near the poles.