In contrast to studies of identity formation of converts to Islam that do not attempt to analyze experiences and identify emotions within different stages of the conversion process, evidence from this mixed-methods study of American female converts to Islam reveals: 1) some converts distinguish between outwardly becoming/being Muslim at the time of conversion to Islam and feeling Muslim; 2) some of the key factors in the development of feelings of Muslimness (as identified by 257 U.S. female converts); 3) the greater the degree of key factors, the more rapidly the feelings of Muslimness develop, and the lesser the degree of key factors, the more slowly the feelings of Muslimness develop, if at all; 4) additional significant issues related to feelings of Muslimness are the degree to which such feelings differ in public and private settings, the extent to which the feelings are esoterically and/or exoterically based, and 5) what feeling Muslim means to American female converts to Islam.