System Usability ScaleCalculator
Calculate your SUS score in under 2 minutes. The System Usability Scale is the industry-standard questionnaire for measuring usability. Use this free SUS calculator to get your score instantly.
What is SUS?
Developed by John Brooke in 1986, SUS has become the go-to method for evaluating usability across industries. Read more about SUS or see how it compares to NPS.
10 Questions
A standardized questionnaire with 10 carefully designed statements rated on a 5-point scale.
0-100 Score
Your responses are calculated into a single score that's easy to understand and compare.
Industry Benchmarks
Compare your score against the industry average of 68 to see where you stand.
How It Works
Answer 10 Questions
Rate each statement from Strongly Disagree to Strongly Agree based on your experience.
Get Your Score
Our calculator applies the official SUS formula to compute your usability score.
Understand Results
See your grade, adjective rating, and how you compare to industry benchmarks.
Collect feedback from your whole team
Create a survey session, share a link, and watch responses roll in. Get aggregated scores, grade distributions, and industry comparisons all in one dashboard.
Create Team SurveyShareable Links
One link for your team to submit anonymous responses.
Live Dashboard
See scores, grades, and distributions as they come in.
Aggregated Stats
Average scores, ranges, and grade breakdowns at a glance.
No Sign-up
Create surveys instantly. No account required.
Score Interpretation
SUS scores are graded on a curve. Here's what your score means.
Best Imaginable
Users love this system. Exceptional usability.
Excellent
Outstanding usability. Very few issues.
Good
Above average usability. Minor improvements possible.
OK
Average usability. Consider improvements.
Poor
Below average. Significant usability issues.
Awful
Major usability problems. Needs redesign.
Ready to measure usability?
Calculate your own score or create a survey to collect feedback from your team.