Home › Clinical Tools

Clinical Calculators & Medical Scores

Guideline-based bedside calculators for clinicians. Free, mobile-friendly, computed locally — no data uploaded.

Anesthesiology

👄 Mallampati

Predict difficult intubation from oropharyngeal view.

🛏️ Aldrete

Readiness for discharge from post-anaesthesia recovery.

Cardiology

Estimate mean arterial pressure from systolic and diastolic blood pressure.

Heart-rate–corrected QT interval.

Major-bleeding risk on anticoagulation in atrial fibrillation.

Risk of major adverse cardiac events in ED chest pain.

Calculate LDL cholesterol from a lipid panel (Friedewald).

🫀 CHA₂DS₂-VASc

Annual stroke risk in non-valvular atrial fibrillation.

14-day risk of death, MI or urgent revascularisation in UA/NSTEMI.

Peri-operative major cardiac risk in noncardiac surgery.

❤️ Sgarbossa

Detect acute MI in the presence of LBBB or ventricular pacing.

Critical care

Quick SOFA for risk of poor outcome in suspected infection.

Aggregate early-warning score for acute deterioration (SpO2 scale 1).

Systemic inflammatory response syndrome criteria (≥ 2 positive).

Grade organ dysfunction in critically ill patients (6 systems, 0–4 each).

Oxygenation severity in ventilated patients (esp. paediatric ARDS).

Predict success of high-flow nasal cannula in acute hypoxaemic respiratory failure.

Emergency

24-hour crystalloid resuscitation volume for major burns.

Likelihood of acute appendicitis (MANTRELS).

📉 Shock Index

Heart rate divided by systolic BP — a marker of haemodynamic instability.

🦶 Ottawa Ankle

Decide whether ankle/foot X-rays are needed after injury.

🦵 Ottawa Knee

Decide whether a knee X-ray is needed after acute injury.

Whether CT is needed after minor head injury (GCS 13–15).

Endocrinology

Estimate insulin resistance from fasting glucose and insulin.

🦋 Burch-Wartofsky

Likelihood of thyroid storm in thyrotoxicosis.

Gastroenterology

Risk of needing intervention in upper GI bleeding; identifies low-risk patients.

Rebleeding and mortality risk after upper GI bleeding (complete score).

Severity and mortality risk in acute pancreatitis (non-gallstone).

Early mortality risk in acute pancreatitis (within 24 h).

Severity of acute pancreatitis (PANCREAS criteria, at 48 h).

Endoscopic stigmata of peptic ulcer bleeding and rebleed risk.

Cleveland Clinic faecal incontinence severity score.

General

Calculate body mass index from weight and height, with WHO weight-status category.

Estimate body surface area (Mosteller formula) for dosing.

Ideal body weight and adjusted body weight for dosing.

Hematology

Pre-test probability of deep vein thrombosis.

Pre-test probability of pulmonary embolism.

Rule out PE in low-risk patients without D-dimer (all 8 negative).

VTE risk in hospitalised medical patients.

Differentiate iron deficiency from thalassaemia trait in microcytosis.

Calculate ANC to grade neutropenia and infection risk.

Clinical pre-test probability of pulmonary embolism (objective, revised Geneva).

🦵 IMPROVE VTE

VTE risk in hospitalised medical patients (IMPROVE model).

Risk-stratify acute PE for 30-day mortality (simplified PESI).

30-day mortality class in acute PE (original PESI).

🩸 Iron deficit

Calculate total iron deficit for replacement.

Assess iron status from serum iron and TIBC.

Pre-test probability of HIT.

An inflammatory and prognostic marker from the differential.

Composite inflammatory marker (platelet × neutrophil / lymphocyte).

Hepatology

🫀 Child-Pugh

Grade severity of chronic liver disease (Class A/B/C).

Model for End-stage Liver Disease with sodium (UNOS).

Non-invasive estimate of advanced hepatic fibrosis.

🫀 Maddrey DF

Severity of alcoholic hepatitis and steroid decision threshold.

🫀 West Haven

Grade the severity of hepatic encephalopathy.

Prognosis in alcoholic hepatitis to guide corticosteroid use.

Non-invasive marker of hepatic fibrosis/cirrhosis.

Predict advanced fibrosis in non-alcoholic fatty liver disease.

Determine whether ascites is due to portal hypertension.

Predict response to corticosteroids at day 7 of treatment.

Infectious disease

Likelihood of group A streptococcal pharyngitis.

Nephrology

Serum anion gap with optional albumin correction.

Estimate creatinine clearance for renal drug dosing.

Estimated GFR by the race-free CKD-EPI 2021 creatinine equation.

Differentiate pre-renal from intrinsic acute kidney injury.

Expected PaCO₂ for a metabolic acidosis.

Calculated serum osmolality and reference for osmolal gap.

Assess renal potassium handling in dyskalaemia.

🧪 Corrected Na

Adjust measured sodium for the dilutional effect of high glucose.

Assess urinary ammonium in normal-anion-gap metabolic acidosis.

🧪 Delta ratio

Detect a mixed metabolic acid–base disorder.

💧 Water deficit

Estimate the free water deficit in hypernatraemia.

🧪 Na deficit

Estimate the sodium deficit to plan correction in hyponatraemia.

Differentiate pre-renal AKI from ATN, useful after diuretics.

Neurology

Score consciousness from eye, verbal and motor responses (3–15).

Short-term stroke risk after a transient ischaemic attack.

Quantify neurological deficit severity in acute stroke (0–42).

Obstetrics

Readiness of the cervix for labour induction.

Oncology

Functional status grading used in oncology.

Functional status on a 0–100 scale.

Predict venous thromboembolism risk in ambulatory cancer patients on chemotherapy.

Pediatrics

Rapid assessment of newborn condition at 1 and 5 minutes.

💧 Maint. fluids

Daily and hourly maintenance fluid requirements by weight.

🫘 Schwartz eGFR

Bedside paediatric estimated GFR from height and creatinine.

Pharmacology

💊 Corr. phenytoin

Adjust total phenytoin level for low albumin (Sheiner-Tozer).

Psychiatry

Screen and grade generalised anxiety severity.

Brief screen for problem drinking.

Three-item screen for hazardous drinking.

Bedside screen for delirium.

Grade alcohol withdrawal severity to guide symptom-triggered treatment.

Grade opioid withdrawal severity (Clinical Opiate Withdrawal Scale).

Respiratory

Community-acquired pneumonia severity and disposition.

🫁 A–a gradient

Alveolar–arterial oxygen gradient (room air, sea level by default).

🚬 Pack-years

Cumulative cigarette exposure for screening and risk.

Oxygenation index for ARDS severity (Berlin definition).

Quantify daytime sleepiness across eight everyday situations.

Screen for obstructive sleep apnoea risk.

Classify a pleural effusion as exudate or transudate.

Multidimensional prognosis in COPD.

In-hospital mortality risk in acute COPD exacerbation.

Predict need for intensive respiratory or vasopressor support in CAP.