Sri Lanka is about 12 times smaller than Turkey.

Turkey is approximately 783,562 sq km, while Sri Lanka is approximately 65,610 sq km, making Sri Lanka 8.37% the size of Turkey. Meanwhile, the population of Turkey is ~83.0 million people (59.9 million fewer people live in Sri Lanka).
Tip: This to-scale comparison of Turkey vs. Sri Lanka uses the Mercator projection, which distorts the size of regions near the poles.