Collect all Likert scale questionnaires once they have been completed.
Beginning with the first question, record the response for each questionnaire.
Add the numbers in your list of responses for the first question. For instance, if the numbers for question one were 3, 4, 5, 3, 2, 5, 5, 1, 4, 4, 2, 4 and 5, the total would be 47.
Divide the total from Step 3 by the number of responses. In this example, there were 13 responses, so you would perform the following equation in order to find the average response for this particular question on your survey:
47 / 13 = 3.6.
Continue this process for each item on your questionnaire.