Machine tool and method for calculating power saving of machine tool

A method for calculating a power saving of a machine tool having a plurality of electric devices that consume power while energized, the method comprising:

• an energization signal detection step for detecting, for each of the electric devices, whether an energization signal is in an energization required state in which energization is required, or an energization non-required state in which energization is not required;
• a prohibition signal detection step for detecting, for each of the electric devices, whether an energization prohibition signal is in a prohibited state in which energization is prohibited, or a permitted state in which energization is permitted;
• a signal determination step for determining whether or not each of the electric devices is in a power saving state in which, in the energization signal detection step and the prohibition signal detection step, the energization signal and the energization prohibition signal for the electric device are respectively in the energization required state and the prohibited state;
• and
• a saving calculation step for determining a cumulative duration of the power saving state, computing a device-specific power saving for each of the electric devices on the basis of the cumulative duration, and calculating a power saving by adding together the device-specific power savings.