Tajikistan is about 252 times bigger than Isle of Man.

Isle of Man is approximately 572 sq km, while Tajikistan is approximately 144,100 sq km, making Tajikistan 25,092% larger than Isle of Man. Meanwhile, the population of Isle of Man is ~91,382 people (9.0 million more people live in Tajikistan).
Tip: This to-scale comparison of Isle of Man vs. Tajikistan uses the Mercator projection, which distorts the size of regions near the poles.