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System Usability Scale (SUS) Practical Guide for 2025
- System Usability Scale (SUS) is a questionnaire that measures perceived usability of a system.
- SUS questionnaire consists of 10 Likert scale questions which participants answer on a 1-5 scale.
- SUS helps measure perceived ease of use for any system (physical or digital).
- Scoring SUS brings a bit of complexity, but its consistency, simplicity, and commonality in the industry make it a worthwhile choice to leverage.
- In this article, we provided a practical guide on the System Usability Scale including calculating and interpreting SUS scores.
- To score SUS, take each positively-oriented question score and subtract one from the participant’s answer. Take each negatively-oriented question score and subtract the participant’s answer from five.
- The average SUS score is 68. A SUS score of 80.8 is in the top 10% of all SUS scores, and a score of 68 corresponds to a “C” grade.
- While the usage of SUS appears to be waning based on recent trends, its simplicity and effectiveness ensure it will remain a valuable resource in the UX researcher’s toolkit for years to come.
- It is important to follow the standard SUS questionnaire to ensure consistent results.
- UXtweak offers a wide array of testing options suitable for early prototype stages or established products.
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