Saint Vincent and the Grenadines is around the same size as Barbados.

Barbados is approximately 430 sq km, while Saint Vincent and the Grenadines is approximately 389 sq km, making Saint Vincent and the Grenadines 90.47% the size of Barbados. Meanwhile, the population of Barbados is ~302,674 people (201,705 fewer people live in Saint Vincent and the Grenadines).
Tip: This to-scale comparison of Barbados vs. Saint Vincent and the Grenadines uses the Mercator projection, which distorts the size of regions near the poles.