Saint Vincent and the Grenadines is about 59 times smaller than Belize.

Belize is approximately 22,966 sq km, while Saint Vincent and the Grenadines is approximately 389 sq km, making Saint Vincent and the Grenadines 1.69% the size of Belize. Meanwhile, the population of Belize is ~412,387 people (311,418 fewer people live in Saint Vincent and the Grenadines).
Tip: This to-scale comparison of Belize vs. Saint Vincent and the Grenadines uses the Mercator projection, which distorts the size of regions near the poles.