PROBLEM TO BE SOLVED: To enable a real cutting distance to be calculated with high accuracy even for a large sized cutting object.;SOLUTION: A real cutting distance calculation method for a rotary tool is used for calculating a real cutting distance of a rotary tool which cuts a cutting object. The method includes: a data input step for inputting a shape of the cutting object before cutting by the tool, a shape of a cutting edge of the tool, and predetermined data including information of a moving path by feeding the tool; a minute cutting edge forming step C1 for, after the data input step, dividing the cutting edge of the tool virtually into a plurality of minute edges to form virtual minute cutting edges; and real cutting distance calculation steps C4-C8 for determining whether or not the cutting object is cut each time the virtual minute cutting edges rotate by a prescribed minute fixed angle, determining a movement distance of the minute cutting edges moving with minute angle rotation when it is determined that the cutting object is cut, and accumulating the movement distance sequentially from a starting point of time of cutting to obtain the real cutting distance.;COPYRIGHT: (C)2013,JPO&INPIT
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