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SUS account.
For odd items: subtract one from the user's answer.
For even numbered items: subtract user responses from 5 Scaling all values ​​from 0 to 4 (four is the most positive response).
Add up the converted answers for each user and multiply the sum by 2.5. This converts the range of possible values ​​from 0 to 100 instead of 0 to 40.
Interpretation of SUS results.
Despite the widespread use of SUS, there was little guidance on interpretation of the system, acceptable modifications of items, and information on reliability and validity.
Over the years, SUS has been used in research to estonia whatsapp number data improve usability assessments exponentially. During this time, existing SUS research has been validated and data from over 5,000 users has been analyzed across 500 different assessments.
These data show that the SUS is reliable, valid, and easy to use. It performs as well as or better than commercial questionnaires and domestically produced questionnaires.
What is a good SUS score?
The average SUS score across all 500 studies is 68. A SUS score above 68 will be considered above average, and a score below 68 will be considered below average.
The best way to interpret your score is to convert it to a percentile rank by normalizing it. I created a calculator and guide that takes raw SUS scores and generates percentile ranks and letter grades (A+ to F) for eight different types of applications.
The graph below shows how percentile ranks are associated with SUS scores and letter grades.
SUS results