Wyoming is about 1.3 times bigger than Nebraska.

Nebraska is approximately 199,099 sq km, while Wyoming is approximately 251,489 sq km, making Wyoming 26% larger than Nebraska. Meanwhile, the population of Nebraska is ~1.8 million people (1.3 million fewer people live in Wyoming).
Tip: This to-scale comparison of Nebraska vs. Wyoming uses the Mercator projection, which distorts the size of regions near the poles.