Wallis and Futuna is about 2.9 times bigger than Bouvet Island.

Bouvet Island is approximately 49 sq km, while Wallis and Futuna is approximately 142 sq km, making Wallis and Futuna 190% larger than Bouvet Island.
Tip: This to-scale comparison of Bouvet Island vs. Wallis and Futuna uses the Mercator projection, which distorts the size of regions near the poles.