Epistemis
Calculators
316 calculators and scores
Spread across 27 specialties. Each entry says what the score measures, which inputs it needs, and how to read the number it produces.
Dosing of Intravenous Inducers and Mass Models
Local Anesthetics: Safety Dosage and LAST Protocol
Advanced Management and Difficult Airway Prediction
Rapid Sequence Induction (RSI): Critical Dosing
Applied Respiratory Physiology: Protective Mechanical Ventilation
Equation of Alveolar Gases and Alveolar-Arterial Gradient (A-a\,DO2)
Fluid Therapy Based on Goals and the Classic 4-2-1 Rule
Allowable Blood Loss and Target Transfusion Algorithm
Perioperative Cardiovascular Pharmacology: Dosage of Vasoactives and Inotropes
Perioperative Risk Assessment: ASA Physical Status and Lee Index
Advanced Surgical Morbidity-Mortality Stratification: POSSUM and P-POSSUM
Neuroaxial Regional Anesthesia: Determination of Baricity and Density
Pediatric and Neonatal Anesthesia: Metrology and Safety
Sensitivity, Specificity and 2x2 Confusion Matrix
Predictive Values and Bayesian Dependence of Prevalence
Likelihood Ratios and Fagan Nomogram
ROC (Receiver Operating Characteristic) Curves and Area Under the Curve
Association Measures: Relative Risk (RR) and Odds Ratio (OR)
Clinical Impact Measures: RAR, RRR and NNT / NNH
Public Health Epidemiology: Attributable Risk and Population Attributable Fraction
Confidence Intervals (CI95%): Precision Estimation of Means and Proportions
Selection of Statistical Tests according to the Measurement Scale
Survival Analysis: Kaplan-Meier and Hazard Ratio (HR) Estimates
Advanced Meta-analysis: Effects Models, Cochran's Q and Heterogeneity (I2)
Cardiac Output by Fick's Principle and Cardiac Index (CO / CI)
Systemic Vascular Resistance (SVR) and Pulmonary Resistance (PVR)
Corrected QT Interval (QTc) - Bazett, Fridericia and Framingham
Aortic Valve Area (AVA) by Continuity Equation
CHA₂DS₂-VASc Risk Scale for Atrial Fibrillation
HEART Score for Chest Pain in the Emergency Room
TIMI Scale for Acute Coronary Syndrome without ST Elevation
TIMI Scale for ST Elevation Infarction (30-day mortality)
Killip-Kimball Classification in Acute Infarction
Modified Sgarbossa criteria (infarction with left bundle branch block)
Brugada Algorithm: Ventricular Tachycardia vs. Supraventricular Tachycardia with Wide QRS
Left Ventricular Hypertrophy by Voltage Criteria (Sokolow-Lyon and Cornell)
Mitral Valve Area by Hemipressure Time (Hatle) and Mean Gradient
Bedside Hemodynamics: Mean Blood Pressure, Pulse Pressure and Shock Index
Duke Treadmill Score (ergometry prediction)
Canadian Syncope Risk Score (risk after syncope)
Ejection Fraction and Ventricular Volumes by Teichholz
Framingham Criteria for the Diagnosis of Heart Failure
ADD-RS: Risk of Acute Aortic Dissection
Hemodynamic Classification of Pulmonary Hypertension (ESC/ERS 2022)
Acute Trauma Clinical Calculators (1 of 4)
Acute Trauma Clinical Calculators (2 of 4)
Acute Trauma Clinical Calculators (3 of 4)
Acute Trauma Clinical Calculators (4 of 4)
Resuscitation in Extensive Burns
Preoperative and Hepatic Risk Assessment (1 of 3)
Preoperative and Hepatic Risk Assessment (2 of 3)
Preoperative and Hepatic Risk Assessment (3 of 3)
Pulmonary and Gas Exchange Evaluation (1 of 2)
Pulmonary and Gas Exchange Evaluation (2 of 2)
Management of Fluids, Losses and Hydration (1 of 2)
Management of Fluids, Losses and Hydration (2 of 2)
Caprini Score for Risk of Venous Thromboembolism
Hemodynamics and Tissue Perfusion in the Critical Patient (1 of 3)
Hemodynamics and Tissue Perfusion in the Critical Patient (2 of 3)
Hemodynamics and Tissue Perfusion in the Critical Patient (3 of 3)
Mechanical Ventilation and Arterial Gases in the ICU (1 of 3)
Mechanical Ventilation and Arterial Gases in the ICU (2 of 3)
Mechanical Ventilation and Arterial Gases in the ICU (3 of 3)
Complex Acid-Base Balance in Critical Care Medicine (1 of 2)
Complex Acid-Base Balance in Critical Care Medicine (2 of 2)
Physiological Scoring and Severity Systems (1 of 3)
Physiological Scoring and Severity Systems (2 of 3)
Physiological Scoring and Severity Systems (3 of 3)
Critical Nephrology, Fluids and Resuscitation in Burns (1 of 3)
Critical Nephrology, Fluids and Resuscitation in Burns (2 of 3)
Critical Nephrology, Fluids and Resuscitation in Burns (3 of 3)
Critical Pharmacology and Infusion Pumps (1 of 2)
Critical Pharmacology and Infusion Pumps (2 of 2)
Body Surface and Topographic Distribution (BSA)
PASI: Psoriasis Area and Severity Index
DLQI: Dermatology Life Quality Index
EASI: Eczema Area and Severity Index
Block A: Extension of Dermatoses (0 - 100%)
SCORTEN: Score of Toxic Epidermal Necrolysis
Fitzpatrick Phototype Classification
mMASI: modified Melasma Area and Severity Index
Melanoma: TNM Staging (AJCC 8th Edition)
Squamous Cell Carcinoma: BWH Risk Staging
Acne Severity Assessment: GAGS and GEA
UAS7: Urticaria Activity Score over 7 days
IHS4: International Hidradenitis Suppurativa Severity Score
SALT: Severity of Alopecia Tool
Correction of Serum Calcium by Albumin
Effective Serum Osmolarity and Anion Gap in DKA
Insulin Resistance (HOMA-IR)
Aldosterone-Renin Ratio (ARR) and Differentiation
Free Water Deficit in Hypernatremia
Disease Frequency Measures and Cohort Indicators
Measures of Association and Link Strength in Epidemiological Designs
Potential Impact Measures and Public Health Decisions
Evaluation of Diagnostic Tests, Screening and Bayesian Update
Sample Size Calculation, Statistical Power and Decision Errors
Clinical Efficacy Metrics in Randomized Controlled Trials
Bias, Confusion and Stratification (Mantel-Haenszel Method)
Epidemiology of Infectious Diseases, Outbreak Surveillance and Transmission Dynamics
Survival Analysis and Time-Event Risk Estimation
Structure of Systematic Reviews, Meta-analysis and Heterogeneity
Safety Epidemiology and Pharmacovigilance Algorithms
Standardization of Rates, Demographics and Standardized Mortality Ratio (SMR)
Basic Pharmacokinetic Parameters Calculator (Vd, Cl, t1/2, Ke)
Loading and Maintenance Dose Optimizer
Anthropometric Dosage Matrix (BSA, IBW, AdjBW)
Kidney Clearance (Cockcroft-Gault) and Carboplatin Dosage (Calvert)
Vancomycin Kinetic Profiler (Sawchuk-Zaske AUC/MIC)
Hartford Evaluator for Aminoglycoside Dosing
Pediatric Maintenance Fluids Calculator (Holiday-Segar)
Equianalgesic Opioid Converter with Cross Tolerance Adjustment
Eckardt Score Calculator
Fecal Osmotic Gap Calculator
Ranson Score Evaluation (Non-Biliary Pancreatitis)
Child-Pugh Calculator
MELD and MELD-Na Calculator (Official some Equation)
FIB-4 Index Calculator
APRI Index Calculator
Ascites Analysis Calculator
Maddrey Discriminant Function Calculator
Glasgow-Blatchford Calculator
Interactive Pfeiffer Test Calculator (SPMSQ)
Yesavage Geriatric Depression Scale Calculator (GDS-15)
Confusion Assessment Method (CAM) Criteria Calculator
Barthel Index Calculator (ABVD)
Lawton and Brody Scale Calculator (AIVD)
SPPB Battery Score Calculator
Timed Up and Go (TUG) Test Interpretation Calculator
MNA-SF Screening Scale Calculator
Fried Frailty Phenotype Calculator
Age-Adjusted Charlson Index Calculator
Gijón Socio-Family Scale Calculator
Zarit Overload Scale Calculator (Zarit-12)
Clinical Simulator of Potentially Inappropriate Medications in the Elderly
Gestational Age and Naegele's Rule
Ovarian Malignancy Risk Index (RMI 1)
Bishop's Index for Cervical Maturation
Dosing and Monitoring of Magnesium Sulfate (MgSO4)
Ganzoni Calculator for Gestational Iron Deficiency Anemia
Scoring and Interpretation of the Fetal Biophysical Profile (Manning)
Reticulocyte Production Index Calculator (IPR / RPI)
Mentzer Index Calculator
Iron Deficiency Calculator (Ganzoni Equation)
Absolute Neutrophil Count (ANC) Calculator
4Ts Scale Calculator for HIT
Khorana Score Calculator
HAS-BLED Bleeding Risk Calculator
IPSS-R Calculator for Myelodysplastic Syndromes
HScore calculator for LHH
Plasma Viscosity and Osmolarity Estimation Calculator
Wells Criteria for Deep Vein Thrombosis (DVT)
Wells Criteria for Pulmonary Embolism (PE)
Total Blood Volume (Nadler Equation)
Pneumonia Severity Calculator: CURB-65 Scale
Sepsis Risk Calculator: qSOFA (Quick SOFA)
Modified Duke Criteria for Infective Endocarditis
Modified Centor Scale (McIsaac) for Pharyngitis due to EbhGA
Adjustment of Antibiotics by Glomerular Filtration Rate
Predictor of Opportunistic Infections and Chemoprophylaxis in HIV
10-Year Atherosclerotic Cardiovascular Disease (ASCVD) Risk Estimator
CHA₂DS₂-VASc Scale for Stroke Risk Stratification in Atrial Fibrillation
HAS-BLED Scale for Hemorrhagic Risk Assessment
2021 CKD-EPI Equation for Glomerular Filtration Rate Estimation (without race variable)
Free Water Deficit in Hypernatremia
Transtubular Potassium Gradient (TTKG)
CURB-65 Community Acquired Pneumonia Severity Scale
Wells Criteria for Pulmonary Thromboembolism (PTE)
Kirby Index — PaO₂/FiO₂ Ratio and Hypoxia
MELD (Model for End-Stage Liver Disease) and MELD-Na score
Albumin Gradient between Serum and Ascites (SAAG)
Anion Gap and Delta-Delta Ratio (Δ/Δ)
Plasma Osmolarity and Osmolar Gap
HOMA-IR index (Homeostatic Model Assessment of Insulin Resistance)
Absolute Neutrophil Count (ANC) and Febrile Neutropenia
eGFR CKD-EPI Calculator (2021)
MDRD-4 Variables Calculator
Cockcroft-Gault Calculator
Schwartz Calculator
FE_Na and FE_Urea calculator
TTKG and FE_K calculator
FE_UA Calculator
Total Body Water Calculator (Watson)
Free Water Deficit Calculator
Adrogué-Madias Calculator
3% Saline Infusion Calculator
Anion Gap Calculator Corrected
Delta-Delta Ratio Calculator
Urinary Anion Gap Calculator
Plasma Osmolar Gap Calculator
Corrected Calcium Calculator
Fractional Excretion of Calcium (FECa) Calculator
TRP and TmP/GFR Calculator
UACR and UPCR calculator
Bicarbonate Deficiency Calculator
24-hour Creatinine Clearance Calculator
KFRE Progression Calculator
APGAR Dynamic Calculator
Gestational Maturity Calculator by Ballard Scale
Fractional Excretion of Neonatal Sodium (FeNa)
Umbilical Catheter Insertion Calculator
Threshold for Phototherapy and Exchange Transfusion
Fluid Intake and Glucose Infusion Rate (GIR)
Oxygenation Index (IO) and Alveolar-Arterial Gradient (A-a)
Oxygen A--a Gradient Calculator
Physiological Dead Space Calculator
Pulmonary Vascular Resistance (PVR) Calculator
Pneumonia Severity Index (PSI / PORT)
BODE Prognostic Index in COPD
STOP-BANG Questionnaire for Obstructive Sleep Apnea
Light's Criteria for Pleural Effusion
Berlin Definition of Acute Respiratory Distress Syndrome
ROX Index for High Flow Nasal Cannula
Interpretation of Spirometry and Bronchodilator Test
GOLD Classification of COPD: Spirometric Grade and ABE Group
PERC Pulmonary Embolism Exclusion Rule
Alveolar Gas and Expected PaO₂, Corrected for Age and Altitude
DLCO Corrected by Hemoglobin and KCO Coefficient
Maximum Expiratory Flow: Variability, Zones and Predicted Value
6 Minute Walk Test: Predicted Distance and Desaturation
Cerebral Perfusion Pressure Calculator (CPP)
Glasgow Coma Scale (GCS)
FOUR Scale (Full Outline of UnResponsiveness)
ABCD² Score for Post-TIA Stroke Risk
ASPECTS Score (Early Ischemia)
NIHSS Simplified Rapid Screening
Intracerebral Hemorrhage Score (ICH Score)
PHASES Score (5-Year Aneurysm Rupture Risk)
McDonald Criteria Evaluator (2017)
Hachinski Ischemia Score
Neuromuscular Ventilatory Risk Evaluator
Epworth Sleepiness Scale
Automated Lumbar Puncture Interpreter
Multi-model Metabolic Calculator
Dynamic Fluid Therapy and Loss Calculator
Caloric Distribution and Elemental Nitrogen Balance Calculator
Boer, Humé and Lorentz Body Composition Calculator
MUST & NRS-2002 Nutritional Screening Calculator
NPT Composition and Osmolarity Calculator
Nitrogen Balance and Catabolic Rate Calculator
Refeeding Syndrome Risk Assessor (NICE Guidelines)
Renal Protein and Electrolyte Dosage Calculator
Critical-Hepatic Metabolic Calculator
Osmotic and Free Water and Electrolytic Ion Deficiency Calculator
Metabolic Criteria and Atherogenic Relationships Calculator
Geometric Optics, Vergences and Ocular Refraction
Astigmatism, Sturm's Conoid and Vector Identification
Biometric Intraocular Lens (IOL) Calculation Formulas
Central Corneal Thickness (CCT) and Adjusted Intraocular Pressure
Prediction of the Risk of Glaucoma Progression and Conversion
Structural Analysis of the Retinal Nerve Fiber Layer (RNFL) and ISNT
Strabismic Physiology: AC/A Ratio in Accommodative Esotropia
Amplitude of Accommodation and Presbyopia (Hofstetter Equations)
Universal Conversion of Visual Acuity Scales
Contrast Sensitivity and Spatial Frequency Curves
Pupillary Pathophysiology and Relative Afferent Pupillary Defect (RPD)
Tear Film Physiology and Ocular Surface Index (OSDI)
Carboplatin (Calvert) Dosage and Body Surface Area (BSA)
Neutrophil Count (ANC) and MASCC Index for Febrile Neutropenia
Tumor Lysis Syndrome (Cairo-Bishop Criteria) and Corrected Calcium
Simplified Estimator of the Gail Model (Breast Cancer Risk)
Opioid Rotation Calculator and PaP Scale
Hypoacusis Screening Calculator (HHIE-S)
Tinnitus Index Calculator (THI-Abbreviated 10 items)
Algorithmic Interpreter of the HINTS Protocol
SSHL Recovery Forecast Calculator
Sino-Nasal Outcome Test Calculator (SNOT-10)
Epistaxis Severity Score (ESS) Calculator
McIsaac Criteria Calculator
OSAS Severity Calculator (IAH and Epworth)
Reflux Symptom Index (RSI) Calculator
Voice Handicap Index Calculator (VHI-10)
House-Brackmann Clinical Classifier
Laryngeal Glottic Cancer Staging Calculator (AJCC 8th Edition)
Body Surface Area and Basal Water Requirements
Glucose Infusion Rate (GIR)
Oxygenation Index and Alveolar-Arterial Gradient
Neonatal Hyperbilirubinemia and Phototherapy
Intravenous Rehydration Therapy
Estimated Glomerular Filtration Rate (Schwartz)
Correction of Sodium Disorders
Excretion Fractions (FE_Na and FE_K)
Pediatric Dosing and Arrest Drugs (PALS)
Endotracheal Tube Diameter and Insertion Depth
Neonatal Clinical Scales (APGAR and Silverman-Andersen)
Family Target Size and Growth Prediction
Basal Pediatric Energy Expenditure
Pediatric Anion Gap and Base Excess
Pediatric Blood Pressure
Major Depressive Disorder (MDD) and Dysthymia
Bipolar Disorder and Mania
Generalized Anxiety Disorder and Panic Crisis
Extrapyramidal Effects and AIMS Scale
Alcohol Abstinence and CIWA-Ar Protocol
Opioid Withdrawal and COWS Scale
Pharmacology of Antidepressants and Serotonin Syndrome
Lithium and Mood Stabilizers
Geriatric Psychiatry: Delirium and Hachinski Scale (1 of 2)
Geriatric Psychiatry: Delirium and Hachinski Scale (2 of 2)
Suicide Risk Assessment in the Emergency Room
Integrated Activity Index Calculator in AR (DAS28, CDAI, SDAI)
ACR/EULAR 2010 Classification Criteria for Rheumatoid Arthritis
EULAR/ACR 2019 Classification Criteria for Systemic Lupus Erythematosus
Interactive Lupus Activity Calculator (SLEDAI-2K Simplified)
Axial Spondyloarthritis Activity Calculator (BASDAI)
ASAS Classification Calculator for Axial Spondyloarthritis (Axial SpA)
Nijmegen Rule of Clinical Prediction for Gout
ACR 1990 Criteria for the Classification of Giant Cell Arteritis
Fibromyalgia Diagnostic Calculator (ACR 2016)
Prostate Volume (Ellipsoid) and PSA Density (PSAD) Calculator
Prostate Symptom Score (I-PSS / IPSS)
Estimated Glomerular Filtration Rate (eGFR) Calculator
Analysis of Bladder Outlet Obstruction (BOOI) and Contractility
PSA Kinetics and Free/Total PSA Ratio (f/t Ratio)
Abbreviated International Index of Erectile Function (IIEF-5 / SHIM)
Fractional Excretion of Sodium (FENa) and Urea (FEUn)
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