The membership is classified as follows:

Honorary Fellows shall be persons who have achieved eminence in mass properties engineering, or who have made outstanding contributions to the advancement of the Society, and who have been elected to Honorary Fellowship by a three-fourths vote of the Board of Directors. Honorary Fellows shall be Life Members of the Society without payment of dues.

Fellows shall be persons who have achieved distinction in mass properties engineering, or who have materially contributed to the advancement of the Society, and who have been elected to Fellowship by a three-fourths vote of the Board of Directors.

Members shall be persons who, at the time of application, are engaged in mass properties engineering or are engaged in related commercial, financial, or manufacturing fields which maintain relationship with mass properties engineers.

Student Members shall be undergraduate or graduate students attending accredited schools or universities full time and whom a faculty member recommends. Student members shall be eligible for transfer to member or associate member grade upon graduation or entering industry. Student members shall be eligible to vote and hold office only in a student chapter.

Retired Members shall be persons who, during their professional career, were members of the Society.

Company Members shall be any organizations interested in the professional practice of mass properties engineering and in promoting the Society. Company members receive all Society publications as well as copies of technical papers presented at the Annual International Conference.