Frankfurt is about 5 times bigger than New Haven.

New Haven is approximately 48 sq km, while Frankfurt is approximately 248 sq km, making Frankfurt 413% larger than New Haven.
Tip: This to-scale comparison of New Haven vs. Frankfurt 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.