# SOFA Score Calculator (Sequential Organ Failure Assessment)

URL: https://speedycalculator.com/calculators/health/sofa-score/
Last updated: 2026-10-30

> The SOFA score calculator grades dysfunction of six organ systems – respiration, coagulation, liver, cardiovascular, brain and kidneys – from 0 to 4 each, for a total of 0–24 that tracks severity and predicts ICU mortality.

## Inputs

- PaO₂/FiO₂ ratio (mmHg)
- On respiratory support (ventilation or CPAP)
- Platelets (×10³/µL)
- Bilirubin (mg/dL, µmol/L)
- Cardiovascular
- Glasgow Coma Scale
- Creatinine (mg/dL, µmol/L)
- Urine output (0 if unknown) (mL/day)

## Results

- Respiration
- Coagulation
- Liver
- Cardiovascular
- Central nervous system
- Renal
- SOFA score
- Approximate ICU mortality

## Formula

```
Respiration (PaO₂/FiO₂): ≥ 400 0, < 400 1, < 300 2, < 200 with support 3, < 100 with support 4
Platelets (×10³/µL): ≥ 150 0, < 150 1, < 100 2, < 50 3, < 20 4
Bilirubin (mg/dL): < 1.2 0, 1.2–1.9 1, 2–5.9 2, 6–11.9 3, ≥ 12 4
Cardiovascular: MAP ≥ 70 0, < 70 1, then by vasopressor dose 2–4
GCS: 15 0, 13–14 1, 10–12 2, 6–9 3, < 6 4
Renal: creatinine (mg/dL) < 1.2 0, 1.2–1.9 1, 2–3.4 2, 3.5–4.9 or urine < 500 mL/d 3, ≥ 5 or urine < 200 mL/d 4
```

## Explanation

SOFA is used to define sepsis (an acute increase of 2 or more points due to infection) and to monitor ICU patients day by day. Rising scores in the first 48 hours predict higher mortality.

### How to use the SOFA Score Calculator

- **PaO₂/FiO₂ ratio**
- **On respiratory support (ventilation or CPAP)**
- **Platelets**
- **Bilirubin**
- **Cardiovascular**
- **Glasgow Coma Scale**
- **Creatinine**
- **Urine output (0 if unknown)**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the worst values in the last 24 hours.

### Inputs explained

FieldWhat to enterPaO₂/FiO₂ ratioIn mmHgOn respiratory support (ventilation or CPAP)Choose one: No, YesPlateletsIn ×10³/µLBilirubinUnits: mg/dL, µmol/LCardiovascularChoose one: MAP ≥ 70 mmHg, MAP < 70 mmHg, Dopamine ≤ 5 or any dobutamine, Dopamine > 5, or epinephrine/norepinephrine ≤ 0.1 µg/kg/min …Glasgow Coma ScaleA numberCreatinineUnits: mg/dL, µmol/LUrine output (0 if unknown)In mL/day

### Example values

How the main result changes when **PaO₂/FiO₂ ratio** changes and everything else stays at the example values above:

PaO₂/FiO₂ ratio (mmHg)SOFA score (/ 24)140321032803350242015601
*Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.*

## Worked example

Inputs — PaO₂/FiO₂ ratio: 280 mmHg; On respiratory support (ventilation or CPAP): No; Platelets: 120 ×10³/µL; Bilirubin: 1 mg/dL; Cardiovascular: MAP ≥ 70 mmHg; Glasgow Coma Scale: 15; Creatinine: 1 mg/dL; Urine output (0 if unknown): 0 mL/day.

Results — Respiration = 2 points; Coagulation = 1 points; Liver = 0 points; Cardiovascular = 0 points; Central nervous system = 0 points; Renal = 0 points; **SOFA score = 3 / 24**; Approximate ICU mortality = Under 10%.

## Key terms

- **SOFA**: Sequential Organ Failure Assessment.

## FAQ

**What SOFA score defines sepsis?**
An acute increase of 2 or more points from baseline, due to infection.

**What is a high SOFA score?**
Above 11 is associated with high mortality.

**Why use the worst value?**
SOFA is scored daily with the worst value of each parameter in 24 hours.


## Sources

- [Vincent JL et al. The SOFA score to describe organ dysfunction/failure. Intensive Care Med, 1996](https://pubmed.ncbi.nlm.nih.gov/8844239/)
- [Ferreira FL et al. Serial evaluation of the SOFA score to predict outcome in critically ill patients. JAMA, 2001](https://pubmed.ncbi.nlm.nih.gov/11594901/)