<p>I just know that I have heard specifically that lack of taking calculus was a significant “strike against” for at least one student I got feedback re admission status. Also IR is one of the most popular majors (and some math is helpful re econ courses etc. although not absolute to have calculus, those that do have a “math mind” seem to find econ easier). Anyway, lack of calculus might be okay (would be interesting to see how many of the current accepted/ at Brown students did not have HS Calculus if it was part of the curriculum at their school) but more likely accepted if you were a potential English/ Art / sociology or some other less represented potential concentrator. Brown wants you to have “taken the most rigorous curriculum available to you”.</p>