The invention discloses a calculating method and a calculating system for a transferred power load of an electric boiler. The calculating method for the transferred power load of the electric boiler comprises the following steps: determining whether to connect a current transformer and a potential transformer between a first measuring meter and the electric boiler based on electrical parameters of the electric boiler; configuring transformer parameters based on the electrical parameters of the electric boiler if the current transformer and the potential transformer are connected; determining whether to connect a current transformer and a potential transformer between a second measuring meter and a circulating water pump based on electrical parameters of the circulating water pump; configuring transformer parameters based on the electrical parameters of the circulating water pump if the current transformer and the potential transformer are connected; and connecting the circulating water pump with an indoor heat supply pipeline; measuring a daily power consumption of the electric boiler and a service rating of the circulating water pump under a preset typical operating condition; and calculating the transferred power load of the electric boiler based on the daily power consumption of the electric boiler and the service rating of the circulating water pump. The transferred power load of the electric boiler can be calculated precisely and effectively by utilizing the electric power measurement of the electric boiler and the power monitoring of the circulating water pump.