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We report on the synthesis of manganese cobalt ferrite (MnCoFeO 4 ) nanoparticles via a simple one-pot coprecipitation method and their characterization through energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared (FT-IR) spectroscopy and N 2 adsorption/desorption techniques. The MnCoFeO 4 supercapacitor showed the maximum specific capacitance of 675 F g À1 at a scan rate of 1 mV s À1 . Its energy and power densities were 18.85 W h kg À1 and 337.50 W kg À1 , respectively, at a current density of 1.5 A g À1 . The cyclic stability was scrutinized via galvanostatic charging/discharging (GCD) and electrochemical impedance spectroscopy (EIS). The degradation of the supercapacitive performance was only 7.14% after 1000 GCD cycles, indicating an excellent long-term stability. The equivalent series resistance (ESR) remained nearly constant even after 1000 GCD cycles.