Luxembourg is about 22 times bigger than Jersey.

Jersey is approximately 116 sq km, while Luxembourg is approximately 2,586 sq km, making Luxembourg 2,129% larger than Jersey. Meanwhile, the population of Jersey is ~102,146 people (548,218 more people live in Luxembourg).
Tip: This to-scale comparison of Jersey vs. Luxembourg uses the Mercator projection, which distorts the size of regions near the poles.