Boston is about 1.9 times bigger than Kalamazoo.

Kalamazoo is approximately 64 sq km, while Boston is approximately 124 sq km, making Boston 94% larger than Kalamazoo.
Tip: This to-scale comparison of Kalamazoo vs. Boston 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.