Wallis and Futuna is about 2.4 times bigger than British Indian Ocean Territory.

British Indian Ocean Territory is approximately 60 sq km, while Wallis and Futuna is approximately 142 sq km, making Wallis and Futuna 137% larger than British Indian Ocean Territory. Meanwhile, the population of British Indian Ocean Territory is ~3,000 people (12,891 more people live in Wallis and Futuna).
Tip: This to-scale comparison of British Indian Ocean Territory vs. Wallis and Futuna uses the Mercator projection, which distorts the size of regions near the poles.

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