If your disability is on an arm or leg, select the appropriate button and the correct percentage for each arm/leg disability. If your disability does not involve an extremity, just select the correct percentage without selecting arm or leg. When inputting your disabilities into this calculator, the word 'arm' includes any of the joints connected to the arm, such as the shoulder, elbow, wrist, or hand. The word 'leg' includes any of the joints connected to the leg, including your hip, knee, ankle, and foot.