Fatigue Severity Scale (FSS)
Fatigue Severity Scale (FSS; Krupp 1989): 9-item self-report of fatigue impact on motivation, exercise, functioning, and daily life.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Item 1 - motivation
- 5
- Item 2 - exercise
- 5
- Item 3 - easily fatigued
- 5
- Item 4 - physical functioning
- 5
- Item 5 - frequent problems
- 5
- Item 6 - sustained functioning
- 5
- Item 7 - duties
- 5
- Item 8 - disabling symptom
- 5
- Item 9 - work, family, social
- 5
Result: FSS mean 5.00 of 7 (sum 45 of 63) — clinically significant fatigue (mean >= 4 is significant).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Bands
- higher = more fatigue impact; a mean of 4 or greater indicates clinically significant fatigue.
What you enter
- Item 1 - motivation (1-7)
- Item 2 - exercise (1-7)
- Item 3 - easily fatigued (1-7)
- Item 4 - physical functioning (1-7)
- Item 5 - frequent problems (1-7)
- Item 6 - sustained functioning (1-7)
- Item 7 - duties (1-7)
- Item 8 - disabling symptom (1-7)
- Item 9 - work, family, social (1-7)
How this is calculated
- Items
- nine statements each rated 1 (strongly disagree) to 7 (strongly agree); score is the mean of the nine ratings (1-7).
Krupp LB, LaRocca NG, Muir-Nash J, Steinberg AD. The fatigue severity scale. Application to patients with multiple sclerosis and systemic lupus erythematosus. Arch Neurol. 1989;46(10):1121-1123. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.