SOFA Score Calculator

Calculate the SOFA (Sequential Organ Failure Assessment) Score for ICU patients by entering values for six organ systems: PaO2/FiO2 ratio (with mechanical ventilation status), platelets, bilirubin, Glasgow Coma Scale (GCS), mean arterial pressure (MAP) or vasopressor requirements, and creatinine. Your results include the total SOFA score, individual organ subscores, and an estimated ICU mortality risk based on validated clinical thresholds.

Disclaimer: This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any health-related decisions.

mmHg

Partial pressure of oxygen in arterial blood

%

Room air = 21%, pure oxygen = 100%

Mechanical Ventilation *

Is the patient on mechanical ventilation or CPAP?

×10³/mm³
mg/dL
mmHg

Vasopressors in Use *

mcg/kg/min
mcg/kg/min
mcg/kg/min
mcg/kg/min

Total GCS score (3 = deeply comatose, 15 = fully alert)

mg/dL
mL/day

24-hour urine output (optional — used to upgrade renal score if low)

Results

Total SOFA Score

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Estimated ICU Mortality

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Severity

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Respiration Subscore

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Coagulation Subscore

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Liver Subscore

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Cardiovascular Subscore

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Neurological Subscore

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Renal Subscore

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Frequently Asked Questions

What is the SOFA score used for?

The SOFA (Sequential Organ Failure Assessment) score is used in intensive care units to track a patient's status during their stay and predict ICU mortality. It evaluates six organ systems — respiratory, coagulation, liver, cardiovascular, neurological, and renal — each scored 0–4 for a maximum total of 24.

How is the PaO₂/FiO₂ ratio calculated?

The PaO₂/FiO₂ (P/F) ratio is calculated by dividing the arterial oxygen partial pressure (PaO₂, in mmHg) by the fraction of inspired oxygen (FiO₂, expressed as a decimal from 0 to 1). For example, a PaO₂ of 90 mmHg on room air (FiO₂ 0.21) gives a P/F ratio of ~429. Lower ratios indicate worse respiratory failure.

What SOFA score indicates a high risk of mortality?

A SOFA score of 0–6 is generally associated with less than 10% ICU mortality. Scores of 7–9 carry roughly 15–20% mortality, scores of 10–12 around 40–50%, scores of 13–14 around 50–60%, and scores of 15 or above are associated with over 80% mortality. These are population-level estimates and individual outcomes vary.

Does the SOFA score account for vasopressor doses?

Yes. The cardiovascular component of the SOFA score is based on MAP and vasopressor requirements. Dopamine ≤5 mcg/kg/min or any dobutamine scores 2; dopamine >5 or epinephrine/norepinephrine ≤0.1 mcg/kg/min scores 3; higher doses score 4. A MAP ≥70 mmHg without vasopressors scores 0.

What is the difference between SOFA and qSOFA?

The full SOFA score requires laboratory values and is used in the ICU to quantify organ failure severity. The qSOFA (quick SOFA) is a simpler bedside tool using only three criteria (respiratory rate ≥22, altered mentation, systolic BP ≤100 mmHg) to rapidly identify sepsis risk outside the ICU. qSOFA is a screening tool, not a severity score.

How does the GCS contribute to the SOFA score?

The neurological component uses the Glasgow Coma Scale (GCS). A GCS of 15 (fully alert) scores 0, GCS 13–14 scores 1, GCS 10–12 scores 2, GCS 6–9 scores 3, and GCS below 6 scores 4.

What creatinine levels correspond to each renal SOFA subscore?

Creatinine <1.2 mg/dL scores 0, 1.2–1.9 scores 1, 2.0–3.4 scores 2, 3.5–4.9 (or urine output <500 mL/day) scores 3, and creatinine ≥5.0 mg/dL (or urine output <200 mL/day) scores 4.

Can SOFA score be used for sepsis diagnosis?

Yes. The Sepsis-3 definition (2016) uses SOFA as part of the diagnostic criteria. An acute increase in SOFA score of ≥2 points from baseline in a patient with suspected infection is consistent with sepsis-related organ dysfunction and is associated with in-hospital mortality greater than 10%.