Chad is about 4,864 times bigger than Cayman Islands.

Cayman Islands is approximately 264 sq km, while Chad is approximately 1,284,000 sq km, making Chad 486,264% larger than Cayman Islands. Meanwhile, the population of Cayman Islands is ~64,309 people (17.9 million more people live in Chad).
Tip: This to-scale comparison of Cayman Islands vs. Chad uses the Mercator projection, which distorts the size of regions near the poles.