Activated carbon (AC) is well-known for its unique properties; hence, the search for new precursors and the investigation of new methods for the preparation of AC is still drawing attention of many researchers. In the present work, microporous AC was prepared from Aegle marmelos fruit shell (AMFS) by potassium hydroxide (KOH) activation. The effect of process parameters such as impregnation ratio, carbonisation temperature and holding time on porous characteristics was investigated. The porous characteristics of prepared AC samples were analysed by N2 adsorption-desorption isotherms, and it was found that the isotherms obtained resemble typical microporous solids (Type-I). The Langmuir surface area and total pore volume of the sample prepared at optimum conditions were found to be 937m2/g and 0.33cm3/g, respectively. The contribution of micropores to the porous characteristics of the prepared AC is very much appreciable, and about 97% of the total surface area and pore volume is attained by micropores. Pore size distribution (PSD) by Dubinin-Astakhov (DA) and micro-pore (MP) methods confirmed the presence of micropores to a great extent with insignificant mesoporosity. (c) 2013 Canadian Society for Chemical Engineering