There is provided a medium feeding apparatus including a feeding roller that feeds a printing medium, a roll holding portion that holds a roll body on which the printing medium is wound, an intermediate roller that pulls out the printing medium from the roll body and feeds the printing medium on the feeding roller, a rotation amount detection portion that detects an amount of rotation of the intermediate roller and an amount of rotation of the roll body when the printing medium is fed by the intermediate roller, and a controller that calculates a roll diameter of the roll body based on the detected amount of rotation of the intermediate roller and the detected amount of rotation of the roll body.