SOFA Score Calculator (Sequential Organ Failure Assessment)
The SOFA (Sequential Organ Failure Assessment) score grades dysfunction in six organ systems — respiratory, coagulation, liver, cardiovascular, central nervous system and renal — each from 0 to 4, for a total of 0 to 24, to describe the severity of critical illness and sepsis.
Quick answer
The SOFA score grades six organ systems — respiratory (PaO₂/FiO₂), coagulation (platelets), liver (bilirubin), cardiovascular (mean arterial pressure and vasopressors), CNS (Glasgow Coma Scale) and renal (creatinine or urine output) — each 0 to 4, for a total of 0 to 24. A higher total means more organ dysfunction; Sepsis-3 uses an acute rise of 2 or more points.
SOFA organ systems
How to use the SOFA calculator
- 1Enter the organ-system values. Enter the PaO₂/FiO₂ ratio (and whether on ventilatory support), platelet count, bilirubin, Glasgow Coma Scale and creatinine (or urine output).
- 2Choose the cardiovascular state. Select the cardiovascular category from the published options: MAP ≥70 with no vasopressors (0) up to high-dose vasopressors (4).
- 3Read the total SOFA. The tool sums the six sub-scores (0–24) and shows the total. Interpretation — and especially a 2-point rise from baseline for sepsis — belongs to a clinician.
Medical disclaimer: This is general health information, not medical advice. It does not diagnose or treat any condition, and the results are estimates based on public reference formulas. Always consult a qualified doctor about your individual health. If you think you may have a medical emergency, contact your local emergency services immediately.
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Book a consultationFrequently asked questions
What is a normal SOFA score?⌄
A SOFA of 0 means no measured organ dysfunction across the six systems. In Sepsis-3, an acute increase in total SOFA of 2 points or more (in a patient with suspected infection) is used to define sepsis-related organ dysfunction.
Does a high SOFA score predict death?⌄
In the original cohorts, higher and rising SOFA scores were associated with higher ICU mortality, but the exact risk depends on the population and the patient’s baseline. This tool reports the total and a general band, not a mortality percentage, because that varies by setting.
What is the difference between SOFA and qSOFA?⌄
qSOFA is a 3-item bedside screen (respiratory rate, systolic blood pressure, altered mentation) used outside the ICU to flag patients who may need closer assessment. The full SOFA score uses labs and organ-support data and grades dysfunction in six systems.
Is my data stored?⌄
No. The calculator runs entirely in your browser; nothing you enter is sent to a server.
Sources & validation
This calculator reproduces the published SOFA score, validated for objective grading of organ dysfunction in critically ill / septic adults (Sepsis-3 uses a ≥2-point rise).
- Vincent JL, Moreno R, Takala J, et al. The SOFA (Sepsis-related Organ Failure Assessment) score to describe organ dysfunction/failure (Intensive Care Med 1996;22:707-710) — the derivation paper with the 0–4 thresholds per system — verified 2026-06-18
- Singer M, Deutschman CS, Seymour CW, et al. The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3) (JAMA 2016;315:801-810) — uses an acute change in total SOFA ≥ 2 to operationalise organ dysfunction — verified 2026-06-18
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