A method for calibrating one or more load sensors in a rotor blade of a wind turbine, which comprises a rotor having a rotor hub and at least one rotor blade, wherein the method comprises the following steps: ∘ checking state and/or operating parameters of the wind turbine in order to ascertain whether calibration is permissible, ∘ continuously measuring at least one calibration condition for the wind turbine and comparing the at least one measured calibration condition with one or more predefined calibration prerequisites, ∘ switching to a calibration mode if the at least one measured calibration condition meets the one or more calibration prerequisites or switching to a restricted production mode if the at least one measured calibration condition does not meet the one or more calibration prerequisites, ∘ collecting measurement data in the calibration mode for as long as the at least one measured calibration condition meets the one or more calibration prerequisites, wherein the calibration mode is terminated when the required data have been collected for the calibration, ∘ switching from the calibration mode to an interruption mode, in which the collection of measurement data is interrupted, if the at least one measured calibration condition does not meet the one or more calibration prerequisites, wherein mode is switched from the interruption mode to the restricted production mode if the at least one measured calibration condition does not meet the one or more calibration prerequisites for longer than a first predefined period of time; wherein mode is switched from the restricted production mode to the calibration mode if the at least one measured calibration condition meets the one or more calibration prerequisites for more than a second predefined period of time, and mode is switched from the interruption mode back to the calibration mode if the at least one or more measured calibration conditions meet the one or more calibration prerequisites. ∘ checking state and/or operating parameters of the wind turbine in order to ascertain whether calibration is permissible, ∘ continuously measuring at least one calibration condition for the wind turbine and comparing the at least one measured calibration condition with one or more predefined calibration prerequisites, ∘ switching to a calibration mode if the at least one measured calibration condition meets the one or more calibration prerequisites or switching to a restricted production mode if the at least one measured calibration condition does not meet the one or more calibration prerequisites, ∘ collecting measurement data in the calibration mode for as long as the at least one measured calibration condition meets the one or more calibration prerequisites, wherein the calibration mode is terminated when the required data have been collected for the calibration, ∘ switching from the calibration mode to an interruption mode, in which the collection of measurement data is interrupted, if the at least one measured calibration condition does not meet the one or more calibration prerequisites, wherein mode is switched from the interruption mode to the restricted production mode if the at least one measured calibration condition does not meet the one or more calibration prerequisites for longer than a first predefined period of time; wherein mode is switched from the restricted production mode to the calibration mode if the at least one measured calibration condition meets the one or more calibration prerequisites for more than a second predefined period of time, and mode is switched from the interruption mode back to the calibration mode if the at least one or more measured calibration conditions meet the one or more calibration prerequisites.