Madagascar is about 9,784 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while Madagascar is approximately 587,041 sq km, making Madagascar 978,302% larger than British Indian Ocean Territory.
Tip: This to-scale comparison of British Indian Ocean Territory vs. Madagascar uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: Madagascar vs. British Indian Ocean Territory