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:

Score range
Accuracy
 %
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How is SUS calculated?
 For positively worded questions take the number of the answer and subtract 1
 For negatively worded questions take the number of the answer and subtract it from 5
 Add all 10 questions’ scores
 Multiply the number by 2.5
 You will get a number between 0 and 100, which is the SUS score