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

Bouvet Island is approximately 49 sq km, while Zambia is approximately 752,618 sq km, making Zambia 1,535,855% larger than Bouvet Island.
Tip: This to-scale comparison of Bouvet Island vs. Zambia uses the Mercator projection, which distorts the size of regions near the poles.