This work aims to present the dosimetry analysis of electromagnetic fields induced by a DC/DC converter installed in an electric vehicle (EV). This paper employs a finite element simulation software to construct an electromagnetic environment model of an adult male in the driver's seat of the EV when the DC/DC converter is in operation, and quantitatively analyze the magnetic flux density (B) and the induced electric field (E) of the driver and the head important tissues. The numerical calculation results are moreover compared with the electromagnetic exposure limits set by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines to assess the safety of the driver's electromagnetic exposure. The results show that the peaks B and E in the driver's whole body are 0.011 μT and 3.39 mV/m, accounting for 0.04% and 0.025% of the ICNIRP limits, respectively, and both appear at the driver's right foot areas. The cerebrospinal fluid tissue has the largest peak B value of 1.98 × 10−3 μT among the driver's head tissues. In the head's coronary, axial, and sagittal planes, the peak E is all 0.94 mV/m, emerging in slices nearest to the converter and gradually diminishing with distance. All the results remain within the safety margins set by the ICNIRP guidelines, signifying that the DC/DC converter poses no health risks to the driver.