Idaho is about 51 times bigger than French Polynesia.

French Polynesia is approximately 4,167 sq km, while Idaho is approximately 214,314 sq km, making Idaho 5,043% larger than French Polynesia. Meanwhile, the population of French Polynesia is ~299,356 people (1.3 million more people live in Idaho).
Tip: This to-scale comparison of French Polynesia vs. Idaho uses the Mercator projection, which distorts the size of regions near the poles.