a calculation device includes : a programmable logic device including a plurality of circuit arrangement areas each to which power supply voltage allowed to be independently controlled is supplied ; and a calculation circuit coupled to the programmable logic device , wherein the calculation circuit : arranges a main circuit that executes specific processing in a first circuit arrangement area included in the plurality of circuit arrangement areas ; acquires a second circuit arrangement area in which a sub circuit that executes the specific processing is allowed to be arranged , included in the plurality of circuit arrangement areas and in which the main circuit is not arranged ; arranges the sub circuit in the second circuit arrangement area ; and causes one of the main circuit and the sub circuit to execute the specific processing .