Argentina is about 46,340 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while Argentina is approximately 2,780,400 sq km, making Argentina 4,633,900% larger than British Indian Ocean Territory.
Tip: This to-scale comparison of British Indian Ocean Territory vs. Argentina uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: Argentina vs. British Indian Ocean Territory