Nebraska is about 1.9 times smaller than Japan.

Japan is approximately 377,915 sq km, while Nebraska is approximately 199,099 sq km, making Nebraska 52.68% the size of Japan. Meanwhile, the population of Japan is ~124.2 million people (122.4 million fewer people live in Nebraska).
Tip: This to-scale comparison of Japan vs. Nebraska uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.