Austin is about 2.1 times bigger than Saint Vincent and the Grenadines.

Saint Vincent and the Grenadines is approximately 389 sq km, while Austin is approximately 829 sq km, making Austin 113% larger than Saint Vincent and the Grenadines.
Tip: This to-scale comparison of Saint Vincent and the Grenadines vs. Austin uses the Mercator projection, which distorts the size of regions near the poles.