Guernsey is about 18,992 times smaller than Alaska.

Alaska is approximately 1,481,348 sq km, while Guernsey is approximately 78 sq km, making Guernsey 0.01% the size of Alaska. Meanwhile, the population of Alaska is ~710,231 people (642,740 fewer people live in Guernsey).
Tip: This to-scale comparison of Alaska vs. Guernsey uses the Mercator projection, which distorts the size of regions near the poles.