The examination of auditory intensity perception has a long history, and comprehensive knowledge exists. However, tactile intensity perception has not been studied as thoroughly. A short literature review provides an overview of the current state of research, with a focus on perceived vibration magnitude. To broaden our knowledge, tactile intensity perception was investigated further in this study. The growth of perceived intensity of seat vibrations with increasing vibration level was compared to auditory loudness. Therefore, a magnitude estimation experiment was performed. Curves of equal vibration intensity have been determined.