Critical Care & ICU Clinical Calculators
Evidence-based ICU and critical care calculators for severity assessment, sedation monitoring, and clinical decision support.
Why This Matters
Critical care mortality remains high despite advances, with sepsis alone accounting for 11 million deaths annually worldwide. Severity scores like SOFA, APACHE II, and qSOFA are essential for objective risk stratification, resource allocation, and prognostication in ICU settings. Accurate use of these scores improves clinical decision-making and facilitates communication among healthcare teams.
When to Use
Use SOFA/qSOFA for sepsis screening and organ failure assessment. Use APACHE II for mortality risk prediction within 24h of ICU admission. Use GCS for neurological assessment. Use RASS for sedation monitoring. Use CURB-65 or PSI/PORT for pneumonia severity. Use Ranson criteria for pancreatitis prognosis.
Available Critical Care & ICU Calculators
P/F Ratio
The PaO2/FiO2 (P/F) ratio is a key indicator of gas exchange efficiency used to diagnose and classify acute respiratory distress syndrome (ARDS) and monitor respiratory function.
Calculate →SOFA Score
The Sequential Organ Failure Assessment (SOFA) score is used to track a patient's status during ICU stay by assessing organ dysfunction across six organ systems. Higher scores are associated with increased mortality.
Calculate →GCS
The Glasgow Coma Scale (GCS) is a neurological scale used to objectively describe the level of consciousness in a patient following traumatic brain injury or other neurological conditions.
Calculate →qSOFA
The quick Sequential Organ Failure Assessment (qSOFA) is a bedside screening tool used to rapidly identify patients at risk of sepsis and poor outcomes. It uses three clinical variables without the need for laboratory tests.
Calculate →CURB-65
The CURB-65 score is a validated clinical prediction tool used to assess the severity of community-acquired pneumonia and guide decisions on whether to treat patients as outpatients or admit them to the hospital.
Calculate →NIHSS
The NIH Stroke Scale (NIHSS) is a systematic assessment tool used to quantify the severity of stroke-related neurological deficits. It is widely used in acute stroke settings to guide treatment decisions.
Calculate →RASS
The Richmond Agitation-Sedation Scale (RASS) is a validated 10-level scale used in ICU to assess the level of sedation and agitation in patients. It ranges from +4 (combative) to -5 (unarousable).
Calculate →PSI/PORT
The Pneumonia Severity Index (PSI), also known as the PORT score, is a comprehensive clinical prediction tool for assessing mortality risk in community-acquired pneumonia. It assigns patients to one of five risk classes (I-V).
Calculate →Ranson Criteria
The Ranson criteria are a set of 11 clinical and laboratory parameters used to predict the severity and mortality of acute pancreatitis. Five criteria are assessed at admission and six at 48 hours.
Calculate →APACHE II
The Acute Physiology and Chronic Health Evaluation (APACHE) II is a severity-of-disease classification system for ICU patients, providing an estimate of mortality risk based on physiological derangement, age, and chronic health status.
Calculate →REMS Score
The Rapid Emergency Medicine Score (REMS) is a simple, physiologic-based score for emergency department patients that predicts in-hospital mortality without requiring laboratory data.
Calculate →SAPS II
The Simplified Acute Physiology Score (SAPS II) is a widely validated ICU severity of illness scoring system for predicting hospital mortality, derived from a large European/North American database of 13,152 patients.
Calculate →MEWS Score
The Modified Early Warning Score (MEWS) is a validated physiological scoring system used to identify hospitalized patients at risk of clinical deterioration and trigger appropriate escalation of care.
Calculate →Shock Index
The Shock Index (SI) is a simple bedside tool calculated as heart rate divided by systolic blood pressure. It is used for rapid assessment of hemodynamic stability in acute care settings, particularly useful in trauma, sepsis, and hemorrhage detection.
Calculate →Lactate Clearance
Lactate clearance is a dynamic measure of tissue perfusion and metabolic recovery used in the management of sepsis, shock, and critical illness. It tracks the percentage decrease in serum lactate over time as a marker of resuscitation effectiveness.
Calculate →CAM-ICU
The Confusion Assessment Method for the ICU (CAM-ICU) is a validated, rapid bedside assessment tool for detecting delirium in critically ill patients, using a 4-feature algorithm to determine the presence or absence of delirium.
Calculate →NUTRIC Score
The NUTRIC score (Nutrition Risk in Critically Ill) is a validated ICU tool that identifies patients who will benefit most from aggressive nutrition therapy. It incorporates age, APACHE II, SOFA, comorbidities, ICU days, and IL-6.
Calculate →
Clinical Guidelines
- Surviving Sepsis Campaign: International Guidelines for Sepsis and Septic Shock (2024)
- SCCM/ESICM Consensus Definitions for Sepsis and Septic Shock (Sepsis-3)
- PADIS Guidelines for Pain, Agitation, Delirium in ICU (2024)
- ATS/IDSA Guidelines for Community-Acquired Pneumonia (2023)
Frequently Asked Questions
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