Karnofsky Performance Status (KPS) Calculator
Estimate a Karnofsky score (0-100, in steps of 10) using functional status inputs, or enter a direct score to get interpretation.
What is the Karnofsky Performance Status?
The Karnofsky Performance Status (KPS) is a widely used functional scoring system in oncology and serious illness care. It quantifies how well a person can perform ordinary tasks, work, and self-care. Scores range from 100 (normal function) down to 0 (death), in increments of 10.
Clinicians use KPS to describe patient condition consistently, support prognosis discussions, track change over time, and help with treatment decisions or clinical trial eligibility.
How this calculator works
This page offers two ways to use the tool:
- Functional estimate mode: Select mobility, activity level, self-care dependence, and symptom burden. The calculator estimates a score and rounds to the nearest KPS decile.
- Direct interpretation mode: Enter a known KPS score (0-100) and get standardized interpretation text instantly.
Because bedside assessment always includes nuance, this should be considered a quick screening aid rather than a replacement for formal clinical evaluation.
Karnofsky score interpretation reference
| Score | Typical Interpretation |
|---|---|
| 100 | Normal; no complaints; no evidence of disease. |
| 90 | Able to carry on normal activity; minor signs or symptoms. |
| 80 | Normal activity with effort; some signs or symptoms. |
| 70 | Cares for self; unable to carry on normal activity/work. |
| 60 | Requires occasional assistance but can meet most needs. |
| 50 | Requires considerable assistance and frequent medical care. |
| 40 | Disabled; requires special care and assistance. |
| 30 | Severely disabled; hospitalization indicated (not necessarily imminent death). |
| 20 | Very sick; active supportive treatment often necessary. |
| 10 | Moribund; rapidly progressive fatal processes. |
| 0 | Dead. |
How clinicians often use KPS in practice
1) Treatment planning
Performance status is often part of determining whether a patient may tolerate surgery, chemotherapy, radiation, or combined treatment pathways.
2) Prognostic framing
Lower KPS values can be associated with greater frailty and higher care needs. Trends over time are often more informative than a single score.
3) Communication across teams
A numeric scale allows oncologists, palliative care clinicians, nurses, and rehabilitation teams to share a common language about functional status.
Practical tips for better scoring consistency
- Score based on current real-world function, not best-case days.
- Consider both self-care and activity tolerance.
- Document context: symptom flare, infection, hospitalization, or medication side effects.
- Reassess periodically, especially after treatment cycles or major clinical events.
Limitations of any automated KPS tool
No automated calculator can fully capture nuanced bedside judgment. Social support, cognitive status, fluctuating symptoms, and comorbid disease can all influence practical function. For that reason, this calculator should support discussion, not replace clinical assessment.
Bottom line
The Karnofsky calculator is useful for quick, structured estimation of performance status and for interpreting known scores. Use it to improve consistency and communication, while always pairing results with clinical judgment and patient-centered context.