SUS Scores and Doubts

1. What is an acceptable SUS score?
2. What does the SUS score indicate?
3. How do I calculate my usability score with SUS?

What is an acceptable SUS score?

What is a Good SUS Score? The average SUS score from all 500 studies is a 68. A SUS score above a 68 would be considered above average and anything below 68 is below average. The best way to interpret your score is to convert it to a percentile rank through a process called normalizing.

What does the SUS score indicate?

Interpreting System Usability Scale (SUS) Score

SUS score will be able to tell you your usability performance in the aspects of effectiveness, efficiency, and overall ease of use. Although each responses yield a score on a scale of 0 – 100, do not mistake it as a percentage or percentile.

How do I calculate my usability score with SUS?

To get this score, we take the normalized single question score and multiply it by 25. For example, if the average response to a single question is 2.5, we then multiply that average by 25 to get a SUS-equivalent score of 62.5.