Madrid is about 1.6 times bigger than Saint Vincent and the Grenadines.

Saint Vincent and the Grenadines is approximately 389 sq km, while Madrid is approximately 604 sq km, making Madrid 55% larger than Saint Vincent and the Grenadines.
Tip: This to-scale comparison of Saint Vincent and the Grenadines vs. Madrid uses the Mercator projection, which distorts the size of regions near the poles.