Method for estimating the torque (Tq) of a synchronous electric machine comprising: - a step of receiving measurements of the stator currents (i 1, i 2, i 3) energizing said machine and a measured value (T rot) of the temperature of said electric machine, - a step of determining a direct component (Id) of said stator currents, a quadrature component (Iq) of said stator currents energizing said machine, and a rotor flux value φf(T rot) corresponding to said measured temperature value (T rot), the measured temperature value (T rot) being comprised between a first predefined temperature (T 1) and a second predefined temperature (T 2), - a step of obtaining a first equivalent overall flux value (phiD(φf(T 1))) corresponding to a rotor flux value at said first temperature (T 1) of said electric machine, from a first map giving said first equivalent overall flux value (phiD(φf(T 1))) as a function of said direct component (Id) of said stator currents and of said quadrature component (Iq) of said stator currents, - a step of obtaining a second equivalent overall flux value (phiD(φf(T 2))) corresponding to a rotor flux value at said second temperature (T 2) of said electric machine, from a second map giving said second equivalent overall flux value (phiD(φf(T 2))) as a function of said direct component (Id) of said stator currents and of said quadrature component (Iq) of said stator currents, - an interpolating step using said first equivalent overall flux value (phiD(φf(T 1))) and said second equivalent overall flux value (phiD(φf(T 2))), and delivering an estimate of the equivalent overall flux (phiD(φf (T rot))) corresponding to said rotor flux value at said measured temperature value (T rot), - a step of estimating the torque (Tq) of said machine using the following formula: Tq = 3 p 2 ∗ phiD φ f T rot ∗ Iq where: - Tq is the torque of said electric machine, - p is the number of pole pairs of said electric machine, - Iq is said quadrature component of said stator currents, - (φf(T rot)) is said rotor flux value at said measured temperature value T rot of said electric machine, - and phiD(φf(T rot)) is said estimate of the equivalent overall flux resulting from said interpolating step. - a step of receiving measurements of the stator currents (i 1, i 2, i 3) energizing said machine and a measured value (T rot) of the temperature of said electric machine, - a step of determining a direct component (Id) of said stator currents, a quadrature component (Iq) of said stator currents energizing said machine, and a rotor flux value φf(T rot) corresponding to said measured temperature value (T rot), the measured temperature value (T rot) being comprised between a first predefined temperature (T 1) and a second predefined temperature (T 2), - a step of obtaining a first equivalent overall flux value (phiD(φf(T 1))) corresponding to a rotor flux value at said first temperature (T 1) of said electric machine, from a first map giving said first equivalent overall flux value (phiD(φf(T 1))) as a function of said direct component (Id) of said stator currents and of said quadrature component (Iq) of said stator currents, - a step of obtaining a second equivalent overall flux value (phiD(φf(T 2))) corresponding to a rotor flux value at said second temperature (T 2) of said electric machine, from a second map giving said second equivalent overall flux value (phiD(φf(T 2))) as a function of said direct component (Id) of said stator currents and of said quadrature component (Iq) of said stator currents, - an interpolating step using said first equivalent overall flux value (phiD(φf(T 1))) and said second equivalent overall flux value (phiD(φf(T 2))), and delivering an estimate of the equivalent overall flux (phiD(φf (T rot))) corresponding to said rotor flux value at said measured temperature value (T rot), - a step of estimating the torque (Tq) of said machine using the following formula: Tq = 3 p 2 ∗ phiD φ f T rot ∗ Iq - Tq is the torque of said electric machine, - p is the number of pole pairs of said electric machine, - Iq is said quadrature component of said stator currents, - (φf(T rot)) is said rotor flux value at said measured temperature value T rot of said electric machine, - and phiD(φf(T rot)) is said estimate of the equivalent overall flux resulting from said interpolating step.