A method for driving an organic light emitting display device includes measuring a characteristic of a panel and storing a measured loading correction value in a first look-up table. The measured loading correction value includes loading information of pixels that correspond to predetermined gray scale values based on the characteristic of the panel The method further includes storing gamma values of the pixels corresponding to the characteristic of the panel in a second lookup table, and obtaining a calculated loading correction value based on pre-stored equations, the first lookup table, and the second lookup table. The calculated loading correction value includes loading information corresponding to gray scale values different from the predetermined gray scale values.