Method for ascertaining a rotational angle of a steering shaft, having the steps: - detecting respective rotational angles (W1, W2, W3) of three toothed gears (Z1, Z2, Z3) of a toothed gear arrangement, wherein the three toothed gears (Z1, Z2, Z3), with different numbers of teeth (z1, z2, z3), are meshed with a gear ring of the steering shaft, and - ascertaining the rotational angle of the steering shaft on the basis of the respective rotational angles (W1, W2, W3) of the three toothed gears (Z1, Z2, Z3) in accordance with a predetermined extraction rule, wherein the rotational angle of the steering shaft is distinctly defined within a predefined angle range by the entirety of the respective rotational angles (W1, W2, W3), wherein the predetermined extraction rule comprises that, within the three toothed gears (Z1, Z2, Z3), two different toothed gear pairings (Z1, Z2), (Z1, Z3) are selected, wherein a first toothed gear of the three toothed gears (Z1, Z2, Z3) is comprised in both of the two toothed gear pairings (Z1, Z2), (Z1, Z3), and wherein, by means of the respective rotational angle (W1, W2, W3) of the two toothed gear pairings (Z1, Z2), (Z1, Z3), a number of complete revolutions of the first toothed gear is distinctly ascertainable in a respective partial angle range, characterized in that - a first value for the number of complete revolutions of the first toothed gear is ascertained from the respective rotational angles (W1, W2) of the toothed gears (Z1, Z2) of a first toothed gear pairing (Z1, Z2) of the two toothed gear pairings (Z1, Z2), (Z1, Z3), and - a second value for the number of complete revolutions of the first toothed gear is ascertained from the respective rotational angles (W1, W3) of the toothed gears (Z2, Z3) of a second toothed gear pairing (Z1, Z3) of the two toothed gear pairings (Z1, Z2), (Z1, Z3), and wherein - a first predetermined addition value is added to the first value if the first value is smaller than the second value, - a second predetermined addition value is added to the second value if the second value is smaller than the first value, - the respective predetermined addition values are added iteratively to the first value and the second value until the first value and the second value correspond. - detecting respective rotational angles (W1, W2, W3) of three toothed gears (Z1, Z2, Z3) of a toothed gear arrangement, wherein the three toothed gears (Z1, Z2, Z3), with different numbers of teeth (z1, z2, z3), are meshed with a gear ring of the steering shaft, and - ascertaining the rotational angle of the steering shaft on the basis of the respective rotational angles (W1, W2, W3) of the three toothed gears (Z1, Z2, Z3) in accordance with a predetermined extraction rule, wherein the rotational angle of the steering shaft is distinctly defined within a predefined angle range by the entirety of the respective rotational angles (W1, W2, W3), - a first value for the number of complete revolutions of the first toothed gear is ascertained from the respective rotational angles (W1, W2) of the toothed gears (Z1, Z2) of a first toothed gear pairing (Z1, Z2) of the two toothed gear pairings (Z1, Z2), (Z1, Z3), and - a second value for the number of complete revolutions of the first toothed gear is ascertained from the respective rotational angles (W1, W3) of the toothed gears (Z2, Z3) of a second toothed gear pairing (Z1, Z3) of the two toothed gear pairings (Z1, Z2), (Z1, Z3), and wherein - a first predetermined addition value is added to the first value if the first value is smaller than the second value, - a second predetermined addition value is added to the second value if the second value is smaller than the first value, - the respective predetermined addition values are added iteratively to the first value and the second value until the first value and the second value correspond.