SUS Calculator Beta

Easily calculate the mean System Usability Score (SUS) from a set of replies. Each row corresponds to a single participant, each column to the score that participant gave. The result is calculated based on the original publication by Brooke, J. (1996). SUS: A ‘quick and dirty’ usability scale, graded 1 = Strongly disagree, 5 = Strongly Agree.

(You can paste directly from an excel by selecting the first cell and pressing ctrl/cmd + v)

Results

Mean SUS score:
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Score range

Accuracy
- %

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How is SUS calculated?

  1. For positively worded questions take the number of the answer and subtract 1
  2. For negatively worded questions take the number of the answer and subtract it from 5
  3. Add all 10 questions’ scores
  4. Multiply the number by 2.5
  5. You will get a number between 0 and 100, which is the SUS score

A detailed analysis of System Usability Scale

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