El Salvador is about 11 times smaller than Laos.

Laos is approximately 236,800 sq km, while El Salvador is approximately 21,041 sq km, making El Salvador 8.89% the size of Laos. Meanwhile, the population of Laos is ~7.7 million people (1.2 million fewer people live in El Salvador).
Tip: This to-scale comparison of Laos vs. El Salvador uses the Mercator projection, which distorts the size of regions near the poles.