Switzerland is about 688 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while Switzerland is approximately 41,277 sq km, making Switzerland 68,695% larger than British Indian Ocean Territory.
Tip: This to-scale comparison of British Indian Ocean Territory vs. Switzerland uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: Switzerland vs. British Indian Ocean Territory