This work reports experimental adsorption data of supercritical methane on K02 microporous activated carbon. The adsorption isotherms were measured using a volumetric method in the experimental pressure range (0 to 12) MPa and the temperature range (273 to 333) K. Based on the Gibbs equation, the experimental data were changed into the absolute amount and analyzed by the adsorption potential model using the characteristic curve. The adsorption isotherm measured at 303 K was adopted to calculate methane adsorption equilibria over a wide range. A comparison of the predicted results is presented with different methods to estimate the adsorbate density and the quasi-saturated vapor pressure. The study demonstrates the most appropriate approach for predicting supercritical methane adsorption equilibrium data.