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N 2 adsorption isotherms of molecular sieve carbon were measured at 77 K and 303 K. The Ar adsorption isotherms of molecular sieve carbon samples were also measured at 303 K. The grand canonical Monte Carlo (GCMC) simulation technique was applied to calculate the N 2 and Ar adsorption isotherms at 303 K using the ultramicropore volume determined by H 2 O adsorption. The comparative method of experimental and simulated isotherms of supercritical N 2 and Ar at 303 K gave the width of the micropore mouth of the molecular sieve carbon, which can be applied to the ultramicropore width determination for other noncrystalline porous solids.