Saint Vincent and the Grenadines is about 545 times smaller than Kansas.

Kansas is approximately 211,900 sq km, while Saint Vincent and the Grenadines is approximately 389 sq km, making Saint Vincent and the Grenadines 0.18% the size of Kansas. Meanwhile, the population of Kansas is ~2.9 million people (2.8 million fewer people live in Saint Vincent and the Grenadines).
Tip: This to-scale comparison of Kansas vs. Saint Vincent and the Grenadines uses the Mercator projection, which distorts the size of regions near the poles.