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18 calculators
Emergency physicians reach for calculations that must be finished in seconds and before imaging: triage scores that separate low-risk chest pain from infarction, quick sepsis screens, and decision rules that help move appendicitis, pulmonary embolism, or subarachnoid haemorrhage towards or away from investigation. Throughput and safety-netting are the priorities, because most rules were derived in fast-moving cohorts. A reassuring score never overrides a concerning history or an unstable examination.
This page groups by clinical area, so the tools below are the ones this setting reaches for — the subject-focused view of the same calculators lives on the categories pages, the full alphabetical list collects everything in one place, and the comparison tool lines up three tools side by side when two of them look interchangeable.
CURB-65 severity score for community-acquired pneumonia.
EmergencyGlasgow Coma Scale.
EmergencyCalculates Shock Index from heart rate and systolic blood pressure.
EmergencyNational Early Warning Score 2 (NEWS2).
EmergencyQuick Sequential Organ Failure Assessment (qSOFA) for identifying patients at high risk of poor outcomes from suspected infection.
EmergencyCalculates Mean Arterial Pressure from systolic and diastolic blood pressure.
CardiologyCalculates heart rate from the number of beats counted over a measured time interval.
CardiologyPulmonary Embolism Rule-Out Criteria (PERC) for identifying patients in whom PE can be safely ruled out without further testing when clinical pre-test probability is low.
EmergencyWells criteria for pulmonary embolism — pre-test clinical probability of PE to guide D-dimer testing and imaging.
EmergencyWells criteria for deep vein thrombosis — pre-test clinical probability of DVT to guide D-dimer testing and compression ultrasound.
EmergencyHEART score for risk stratification of undifferentiated chest pain in the emergency department, predicting 6-week risk of major adverse cardiac events (MACE).
EmergencySystemic Inflammatory Response Syndrome (SIRS) criteria — the presence of two or more criteria (temperature, heart rate, respiratory rate, white blood cell count) indicates SIRS.
EmergencyCRB-65 severity score for community-acquired pneumonia risk stratification, usable without laboratory testing (Confusion, Respiratory rate, Blood pressure, age 65+).
EmergencyPneumonia Severity Index (PSI / PORT score) for 30-day mortality risk stratification in community-acquired pneumonia to guide site-of-care decisions.
EmergencyRevised Trauma Score (RTS) using coded Glasgow Coma Scale, systolic blood pressure, and respiratory rate to triage trauma patients and predict survival.
EmergencyParkland (Baxter) formula for initial crystalloid resuscitation of adults with thermal burns: 4 mL/kg/%TBSA over 24 hours, with half in the first 8 hours and half over the following 16 hours.
EmergencyRisk-stratifies patients with suspected acute appendicitis using the Alvarado (MANTRELS) scoring system. Assists in clinical decision-making regarding imaging, observation, and surgical consultation.
EmergencyDetermines whether N-acetylcysteine (NAC) treatment is indicated following a single acute acetaminophen (paracetamol) ingestion, based on the serum acetaminophen concentration and time since ingestion.
Emergency