Critical care medical calculators
All 13 Critical care medical calculators on DocMath, A–Z. All specialties
- APACHE II scoreSeverity of illness on ICU admission: Acute Physiology Score (12 variables, worst value in the first 24 h) + age points + chronic health points (0–71).
- Driving pressure and static compliance (ventilated patients)Driving pressure (plateau pressure − PEEP) and static respiratory-system compliance from an inspiratory and expiratory hold in a passive patient.
- Glasgow Coma Scale (with GCS-Pupils)Level of consciousness from eye, verbal and motor responses; optional pupil reactivity gives the GCS-P score.
- modified NUTRIC score (ICU nutrition risk)Nutrition Risk in the Critically ill score without IL-6 (0–9): identifies ICU patients most likely to benefit from adequate protein–energy provision.
- NEWS2 (National Early Warning Score 2)Aggregate early warning score for acute illness and deterioration in adults; preferred over qSOFA for in-hospital sepsis screening (SSC 2026).
- PaO₂/FiO₂ ratio & ARDS oxygenation criteria (Berlin and 2024 global definition)Calculates the PaO₂/FiO₂ (or SpO₂/FiO₂) ratio and applies the Berlin (2012) and global (2024) ARDS oxygenation criteria.
- Pediatric ARDS oxygenation criteria and severity (PALICC-2: OI, OSI, P/F, S/F)Oxygenation index (OI), oxygen saturation index (OSI) or P/F and S/F ratios with the 2023 PALICC-2 thresholds for pediatric ARDS (PARDS).
- Predicted body weight & lung-protective tidal volume (ARDSNet)Predicted body weight from sex and height, and the tidal volume at 4, 6 and 8 mL/kg PBW for lung-protective ventilation.
- qSOFA (quick SOFA)Bedside prompt for poor outcome in adults with suspected infection outside the ICU.
- Richmond Agitation–Sedation Scale (RASS)Ten-level scale of agitation and sedation depth in ICU patients.
- Shock indexHeart rate divided by systolic blood pressure: a quick bedside marker of circulatory compromise.
- SOFA score (Sequential Organ Failure Assessment)Grades dysfunction of six organ systems; an acute rise of ≥2 points defines sepsis-related organ dysfunction (Sepsis-3).
- SOFA-2 score (2025 update)Updated SOFA (JAMA 2025) with contemporary organ support: high-flow/non-invasive support, combined noradrenaline + adrenaline dosing, mechanical circulatory support and RRT criteria.