Saint Vincent and the Grenadines is about 47 times smaller than Fiji.

Fiji is approximately 18,274 sq km, while Saint Vincent and the Grenadines is approximately 389 sq km, making Saint Vincent and the Grenadines 2.13% the size of Fiji. Meanwhile, the population of Fiji is ~943,737 people (842,768 fewer people live in Saint Vincent and the Grenadines).
Tip: This to-scale comparison of Fiji vs. Saint Vincent and the Grenadines uses the Mercator projection, which distorts the size of regions near the poles.