Bouvet Island is about 15,360 times smaller than Zambia.

Zambia is approximately 752,618 sq km, while Bouvet Island is approximately 49 sq km, making Bouvet Island 0.01% the size of Zambia.
Tip: This to-scale comparison of Zambia vs. Bouvet Island uses the Mercator projection, which distorts the size of regions near the poles.