British Indian Ocean Territory is about 8,552 times smaller than Thailand.

Thailand is approximately 513,120 sq km, while British Indian Ocean Territory is approximately 60 sq km, making British Indian Ocean Territory 0.01% the size of Thailand. Meanwhile, the population of Thailand is ~71.6 million people (71.6 million fewer people live in British Indian Ocean Territory).
Tip: This to-scale comparison of Thailand vs. British Indian Ocean Territory uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.