The degree of Master of Science in mechanical engineering is only awarded to students who do not already have an M.S. degree in mechanical engineering. The degree will be awarded upon request by students who have fulfilled the requirements. Only in exceptional cases is there admission to the M.S. program as the final degree objective.

A minimum of 138 units of courses numbered 100 or above, that meet the required master's program listed below, must be passed with a grade of at least C for completion of the master's degree in mechanical engineering. All units must be taken for grades, except for courses offered only on a pass/fail basis. The M.S. degree in mechanical engineering is typically completed within the first two years of residency at Caltech.

Each student's program must be approved by the advisor and option representative in mechanical and civil engineering before registering for the course.