"Hidden costs" of attending Yale

I know what Financial Aid reports as the cost, but I’d like to get some insight into the “Other” costs that students will likely incur to attend Yale so that we can accurately account for those in financial planning. I’d like some idea of a low, average and high end of “Other” expenses we need to be prepared for on a monthly basis.

I expect that there are certain typical things that students need extra money for, such as club dues or fees for other extracurricular activities; school supplies other than books; tickets to campus shows, concerts, exhibits, games, etc.; travel into DC, New York or other popular destinations for students; nights out at TOADS or other local establishments; the occasional shopping trip; purchase of Yale gear and spirit-wear; etc.

I know Yale students come from a wide range of socioeconomic backgrounds and interests, so this can vary greatly. But I’d appreciate any input parents can give me from their experience with a Yale freshman.