Assess your frailty risk using the deficit accumulation model. Evaluate 35+ health deficits to calculate your Frailty Index (FI) score and understand your frailty status.
Check all health deficits that apply to you. The Frailty Index is calculated as the number of deficits present divided by the total number of deficits assessed.
The Frailty Index (FI) is based on the deficit accumulation model developed by Dr. Kenneth Rockwood and Dr. Arnold Mitnitski. It measures frailty by counting the number of health deficits (symptoms, conditions, disabilities) a person has, divided by the total number of deficits assessed.
| FI Range | Category | Description |
|---|---|---|
| < 0.08 | Robust | Excellent health with minimal deficits. Low risk of adverse outcomes. |
| 0.08 – 0.25 | Pre-Frail | At risk of becoming frail. Early intervention may prevent progression. |
| 0.25 – 0.40 | Mildly Frail | Some functional decline. Increased vulnerability to stressors. |
| 0.40 – 0.60 | Moderately Frail | Significant frailty. High risk of falls, hospitalization, and disability. |
| > 0.60 | Severely Frail | Very high deficit burden. Requires comprehensive geriatric assessment. |
Frailty affects approximately 10-15% of community-dwelling older adults, with rates increasing significantly after age 80.
Frailty is not a fixed state. With appropriate interventions, some individuals can transition from frail to pre-frail or robust.
Regular physical activity, adequate nutrition, social engagement, and management of chronic conditions can help prevent or delay frailty.
Frail individuals are at higher risk for falls, hospitalization, institutionalization, disability, and mortality.
The Frailty Index (FI) is a well-validated measure of frailty developed by Dr. Kenneth Rockwood and colleagues at Dalhousie University. It operates on the simple principle that the more health deficits a person has, the more likely they are to be frail. A deficit can be any symptom, sign, disease, disability, or laboratory abnormality that is associated with age and adverse health outcomes.
The FI has been extensively validated in large population studies and is considered one of the most robust approaches to frailty measurement. Unlike simpler frailty scales that focus only on physical characteristics, the FI captures the multidimensional nature of frailty, including physical, mental, and social health domains. This makes it a powerful tool for identifying individuals at risk of adverse outcomes such as falls, hospitalization, and mortality.
Importantly, the FI is a continuous measure — it treats frailty as a matter of degree rather than a simple present/absent classification. This allows for more nuanced assessment and tracking of changes over time, making it useful for both clinical practice and research.
The calculation is straightforward: FI = number of deficits present / total number of deficits assessed. For example, if you have 12 deficits out of a possible 35, your FI is 12/35 = 0.34. This value represents the proportion of potential deficits that you currently have. A higher FI indicates a greater burden of health deficits and, consequently, a higher degree of frailty.
Typically, a Frailty Index includes 30 to 40 or more deficits to provide a reliable estimate. Our calculator uses 35 carefully selected deficits across six domains to provide a comprehensive yet practical assessment.
Frailty assessment is increasingly recognized as an essential component of geriatric care and preventive medicine. Here's why it matters:
Frailty is a strong predictor of adverse health outcomes including falls, hospitalization, institutionalization, disability, and mortality — often more powerful than chronological age alone.
Frailty status can help guide treatment decisions. For example, frail individuals may benefit from modified medication regimens, prehabilitation before surgery, and more intensive post-discharge support.
Identifying pre-frailty or early frailty allows for timely interventions such as exercise programs, nutritional support, and social engagement that can reverse or slow progression.
Understanding frailty prevalence in clinical settings helps healthcare systems allocate resources effectively, plan for care needs, and implement targeted prevention programs.
⚠️ Important Medical Disclaimer: This Frailty Index Calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. The Frailty Index is a research tool and should not be used as the sole basis for clinical decisions. Always consult a qualified healthcare provider (such as a geriatrician or primary care physician) with any questions about your health status or frailty risk. Do not change your medications or treatment plan based solely on the results from this calculator.