SUS Usability Score - Online Calculator

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📝 SUS Usability Score

Auto-scores the 10-item SUS questionnaire (0~100) plus grade (A~F) for UX acceptance testing

Please rate each item (1 = Strongly disagree ~ 5 = Strongly agree)

Scoring rules (SUS, standard 10 items)

· Odd items (1,3,5,7,9): contribution = rating − 1; even items (2,4,6,8,10): contribution = 5 − rating.

· Total SUS = sum of ten item contributions × 2.5, range 0~100. Grades (Sauro/Lewis): A ≥ 80.3, B 73.9–80.3, C 67.9–73.9, D 51.7–67.9, F < 51.7.

· Interpretation: SUS ≥ 80 is generally regarded as excellent usability; above the ~68.0 benchmark means above average.

SUS System Usability Scale calculator: 10-item odd/even scoring to a 0-100 score, usability grade and industry benchmark comparison.