Die-casting machine with inverter, comprising: - an injection assembly provided with an injection piston for pressurizing cast metal poured into a die and a hydraulic circuit for actuating the injection piston; - a hydraulic pump for feeding the hydraulic circuit through a delivery line; - an electric motor for actuating the hydraulic pump and an inverter for actuating the electric motor; - an evaluation system of the energy savings with respect to a die-casting machine without inverter, comprising: a) a delivery pressure sensor suitable to detect the pump delivery pressure (Pm) over a time interval (Δt); b) consumption detection means suitable to detect the real energy consumption (ΔEc) of the inverter for said time interval (Δt); c) storage means wherein the data relating to the power absorbed by an electric motor without inverter for a delivery pressure are stored; d) processing means suitable to obtain the delivery pressure (Pm) from the delivery pressure sensor and the absorbed power (Pa*) of a predefined electric motor without an inverter for the predefined delivery pressure (Pm) from the storage means to calculate an estimated energy consumption over the time interval (ΔE*=Pa*Δt); e) display means for the representation of data acquired by the processing means. - an injection assembly provided with an injection piston for pressurizing cast metal poured into a die and a hydraulic circuit for actuating the injection piston; - a hydraulic pump for feeding the hydraulic circuit through a delivery line; - an electric motor for actuating the hydraulic pump and an inverter for actuating the electric motor; - an evaluation system of the energy savings with respect to a die-casting machine without inverter, comprising: a) a delivery pressure sensor suitable to detect the pump delivery pressure (Pm) over a time interval (Δt); b) consumption detection means suitable to detect the real energy consumption (ΔEc) of the inverter for said time interval (Δt); c) storage means wherein the data relating to the power absorbed by an electric motor without inverter for a delivery pressure are stored; d) processing means suitable to obtain the delivery pressure (Pm) from the delivery pressure sensor and the absorbed power (Pa*) of a predefined electric motor without an inverter for the predefined delivery pressure (Pm) from the storage means to calculate an estimated energy consumption over the time interval (ΔE*=Pa*Δt); e) display means for the representation of data acquired by the processing means. a) a delivery pressure sensor suitable to detect the pump delivery pressure (Pm) over a time interval (Δt); b) consumption detection means suitable to detect the real energy consumption (ΔEc) of the inverter for said time interval (Δt); c) storage means wherein the data relating to the power absorbed by an electric motor without inverter for a delivery pressure are stored; d) processing means suitable to obtain the delivery pressure (Pm) from the delivery pressure sensor and the absorbed power (Pa*) of a predefined electric motor without an inverter for the predefined delivery pressure (Pm) from the storage means to calculate an estimated energy consumption over the time interval (ΔE*=Pa*Δt); e) display means for the representation of data acquired by the processing means.