California is about 3,257 times bigger than Boston.

Boston is approximately 124 sq km, while California is approximately 403,882 sq km, making California 325,611% larger than Boston.
Tip: This to-scale comparison of Boston vs. California 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.