Trenton is about 322 times smaller than Shanghai.

Shanghai is approximately 6,341 sq km, while Trenton is approximately 20 sq km, making Trenton 0.31% the size of Shanghai.
Tip: This to-scale comparison of Shanghai vs. Trenton 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.