Phoenix is about 3.5 times bigger than Saint Vincent and the Grenadines.

Saint Vincent and the Grenadines is approximately 389 sq km, while Phoenix is approximately 1,342 sq km, making Phoenix 245% larger than Saint Vincent and the Grenadines.
Tip: This to-scale comparison of Saint Vincent and the Grenadines vs. Phoenix uses the Mercator projection, which distorts the size of regions near the poles.