The invention discloses a calculation method used for calculating the load power and the power consumption of a washing machine. The method comprises: step1, measuring motor input power and recordingas W0; step2, determining the load interval parameter of a washing machine load amount and recording as F; step3, determining a water level height interval parameter in the washing machine and recording as S; step4, setting the washing power coefficient of the washing machine to be C, a dehydration power coefficient to be K, the washing power of the washing machine to be Wt, and the dehydration power of the washing machine to be Wx so that the washing power of the motor is Wt=(F+S)*C+W0, and the dehydration power is Wx=K*Wth, wherein the Wth is the washing power at the end of the washing machine; and step5, calculating the power consumption of the washing machine to be sigma(Wt*ta)+ sigma(WX*tb). Through monitoring the power of the washing machine motor and the load of the washing machine,the load power and the power consumption are calculated, the different stages of washing machine operation are separately calculated, accumulation and displaying are performed according to time, andthe consumed power of the washing machine can be displayed in real time.