A method may include: calculating a first assistance torque to be provided to a user wearing a walking assistance apparatus; measuring a degree of twisting of a portion of the apparatus; calculating a second assistance torque transferred to the user based on the degree of twisting; and/or calculating a third assistance torque based on the first and second assistance torques, the third assistance torque corresponding to correction of the twisting. An assistance torque calculation apparatus may include: a bend sensor configured to measure a degree of twisting of a portion of a walking assistance apparatus; and/or a processor configured to calculate a first assistance torque to be provided to a user wearing the walking assistance apparatus, configured to calculate a second assistance torque transferred to the user based on the degree of twisting, and/or configured to calculate a third assistance torque based on the first and second assistance torques.