Itqualityassurance
Interpreting System Usability Scale (SUS) Score
| SUS Score | Grade | Adjective Rating |
|---|---|---|
| > 80.3 | A | Excellent |
| 68 – 80.3 | B | Good |
| 68 | C | Okay |
| 51 – 68 | D | Poor |
Is a higher SUS score better?
A SUS score of 74 has higher perceived usability than 70% of all products tested. It can be interpreted as a grade of a B-. You'd need to score above an 80.3 to get an A (the top 10% of scores). This is also the point where users are more likely to be recommending the product to a friend.
What are the SUS numbers?
The SUS rating is a number from 0 to 100. The higher the SUS of your site, the easier it is to use. The SUS is derived from a 10-item questionnaire that users answer after completing a test. The answers are on a scale of 1 to 5, where one means that they disagree completely and five that they fully agree.
How many point rating scale does SUS have?
The SUS is composed of ten statements, each having a five-point scale that ranges from Strongly Disagree to Strongly Agree. There are five positive statements and five negative statements, which alternate.
