SUS Scoring
Turns ten answers from 1 to 5 into a score from 0 to 100.
SUS = [Σ odd (answer − 1) + Σ even (5 − answer)] × 2.5
Worked example: If the ten adjusted scores add up to 32, SUS = 32 × 2.5 = 80.
Why it matters
The odd questions are positive and the even ones negative, so they are scored differently.
How to use it
- For odd items, subtract 1 from the answer.
- For even items, subtract the answer from 5.
- Add all ten, then multiply by 2.5.
Example
Answering 3 to everything gives a score of 50.