Boulder is about 4.1 times smaller than Savannah.

Savannah is approximately 283 sq km, while Boulder is approximately 70 sq km, making Boulder 24.56% the size of Savannah.
Tip: This to-scale comparison of Savannah vs. Boulder uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.