We developed activated carbon from the Aegle marmelos fruit shell also known as Beli. Firstly, its carbonaceous process is done by a typical process. H 3 PO 4 treatment was used to activate the carbonaceous material. Activated material is characterized by using Scanning Electron Microscope and Brunauer-Emmett-Teller (BET) specific surface areas. Calculated BET surface area of the fabricated supercapacitor is 517 m 2 /g. Electrochemical characterization was carried out through cyclic voltammetry, charge / discharge and electrochemical impedance spectroscopy. Highest specific capacitance of 59 F/g and energy density of 18.9 kw/h for highest specific capacitance was obtained from the charge discharge curve. Obtained serial resistance is 0.414 from equivalent circuit.