Frailty Index Calculator

Calculate frailty index from accumulated health deficits such as mobility loss, weight loss, fatigue, chronic disease, and falls.

978.8K uses Updated · 2026-05-25 Runs locally · zero upload
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How to Use the Frailty Index Calculator

Check each health deficit that is present, including mobility decline, unintentional weight loss, fatigue, weak grip, slow walking, multiple chronic diseases, cognition or mood concerns, poor nutrition, and falls history.

The calculator divides present deficits by total assessed deficits to produce a percentage and frailty category. Use the same deficit list for follow-up comparisons.

Formula and Method - Frailty Index Calculator

Frailty Index = (present health deficits ÷ total assessed deficits) × 100%

The frailty index uses the deficit accumulation model: more health deficits imply greater vulnerability. Percentage format helps interpretation, but trend comparisons work best when the item list is stable.

Use Cases for the Frailty Index Calculator

  • Rapid frailty screening in geriatric assessment.
  • Identifying people who may need additional discharge or long-term-care support.
  • Tracking whether rehabilitation, nutrition, or exercise interventions reduce deficits.

Frequently asked questions about Frailty Index Calculator

What if one item is unknown?

Try to complete the assessment; if items are skipped, document the denominator used.

What does a higher index mean?

It indicates a higher share of health deficits and usually greater vulnerability.

Does this replace clinical frailty scales?

No. It is a structured estimate that should be combined with function and clinical judgment.