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This research is the result of an effort to objectively quantify idle vibration felt at the seat during steady-state idle conditions. A previously used seat vibration metric using the root-sum-square (RSS) of vertical, lateral and longitudinal degrees-of-freedom (DOFs) measured at the seat base was found to not adequately describe the human perception of 34 test subjects (R2=0.63). Using the Ford vehicle vibration simulator, a new metric was developed. Thirty-four test subjects participated in a paired comparison study in which six-DOF (vertical, lateral, longitudinal, pitch, roll and yaw) simulations were reproduced from eight different vehicles. The stimuli used in the study spanned a wide range of vehicles, engine types and configurations. The paired comparison subjective results were used in a correlation of objective metrics. The resulting metric takes vibration measured at various locations of the seat base and projects these vibrations to the seat top.