Arizona is about 4.5 times bigger than Sri Lanka.

Sri Lanka is approximately 65,610 sq km, while Arizona is approximately 294,312 sq km, making Arizona 349% larger than Sri Lanka. Meanwhile, the population of Sri Lanka is ~23.2 million people (16.8 million fewer people live in Arizona).
Tip: This to-scale comparison of Sri Lanka vs. Arizona uses the Mercator projection, which distorts the size of regions near the poles.