Wisconsin is about 539 times bigger than Saint Kitts and Nevis.

Saint Kitts and Nevis is approximately 261 sq km, while Wisconsin is approximately 140,663 sq km, making Wisconsin 53,794% larger than Saint Kitts and Nevis. Meanwhile, the population of Saint Kitts and Nevis is ~54,488 people (5.6 million more people live in Wisconsin).
Tip: This to-scale comparison of Saint Kitts and Nevis vs. Wisconsin uses the Mercator projection, which distorts the size of regions near the poles.