Phoenix is about 1.4 times bigger than Indianapolis.

Indianapolis is approximately 935 sq km, while Phoenix is approximately 1,342 sq km, making Phoenix 44% larger than Indianapolis.
Tip: This to-scale comparison of Indianapolis vs. Phoenix 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.