The invention provides an energy consumption estimation calculation method and system and an air conditioner. The energy consumption estimation calculation method is used for the air conditioner, andcomprises the steps of receiving a set signal and determining the preset state and the preset temperature according to the set signal; detecting the outdoor environment temperature and the indoor environment temperature in real time; determining the compressor power consumption of the air conditioner according to the outdoor environment temperature, the indoor environment temperature and a first preset formula corresponding to the preset state; determining set temperature coefficients according to the set temperature, the indoor environment temperature and a second preset formula correspondingto the preset state; determining the overall energy consumption of the air conditioner according to the set temperature coefficients and the compressor power consumption; and generating and displaying a first prompt message corresponding to the overall energy consumption. By means of the technical scheme, estimation of the energy consumption of the air conditioner is achieved, users can master the energy consumption of the air conditioner at the set temperature under the current circumstance conveniently and can adjust the set temperature of the air conditioner in time so that the energy consumption of the air conditioner can be reduced, the possibility that the air conditioner runs with high energy consumption within the human comfort range is reduced, the energy consumption is reduced,and the user experience is improved.