How much does being on the Princeton waitlist actually improve your chances compared to a regular rejection?

A Princeton waitlist is meaningfully better than a rejection, but it is still a long shot.

A rejection means your chance is effectively zero for that cycle. A waitlist means Princeton considered you admissible and wants the option to take you later if space opens up. So it is not just a symbolic gesture. It reflects that your application was strong enough to stay in contention.

The realistic interpretation is this: a waitlist is better than a rejection in a real way, but not by enough to assume there is a likely path to admission. It means you cleared a high bar, but the next step depends less on your qualifications and more on institutional needs like class balance, housing, intended majors, geography, and how the incoming class shapes up.

In practical terms, you should treat it as a possible but unlikely outcome. If Princeton gives you the option to remain on the waitlist, accept it if you would definitely attend, send any allowed update or letter of continued interest, and then fully commit to another college by the deposit deadline.