Phoenix is about 1.7 times bigger than Charlotte.

Charlotte (map shows its 157 named neighbourhoods; the area covers the whole city) is approximately 807 sq km, while Phoenix is approximately 1,342 sq km, making Phoenix 66% larger than Charlotte.
Tip: This to-scale comparison of Charlotte 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.