Cardiology Calculators & Clinical Risk Scores
Access our comprehensive collection of evidence-based cardiology calculators and risk scores. These tools help clinicians assess cardiovascular risk, guide treatment decisions, and improve patient outcomes.
Why This Matters
Cardiovascular disease (CVD) is the leading cause of death worldwide, accounting for over 17.9 million deaths annually. Clinical risk scores like CHADS-VASc, HEART, and TIMI are essential tools for risk stratification, guiding decisions on anticoagulation, revascularization, and discharge planning. Early and accurate risk assessment reduces mortality and improves resource utilization in both emergency and outpatient settings.
When to Use
Use these cardiology calculators when evaluating patients with atrial fibrillation (CHA₂DS₂-VASc, HAS-BLED), chest pain or suspected ACS (HEART, TIMI), dyspnea or heart failure (Framingham, NYHA, Killip), or suspected venous thromboembolism (Wells DVT/PE). These tools complement but do not replace clinical judgment.
Available Cardiology Calculators
CHADS-VASc
The CHADS-VASc score is a clinical prediction tool used to estimate the risk of stroke in patients with atrial fibrillation. It guides anticoagulation therapy decisions.
Calculate →HEART Score
The HEART score is a validated clinical tool for risk stratification of patients presenting with chest pain to the emergency department, predicting 30-day major adverse cardiac events (MACE).
Calculate →TIMI STEMI
The TIMI Risk Score for STEMI is a clinical prediction tool that estimates 30-day mortality risk in patients with ST-elevation myocardial infarction (STEMI) undergoing fibrinolysis. Developed from the InTIME-II trial, it uses 9 weighted variables.
Calculate →NYHA Class
The New York Heart Association (NYHA) Functional Classification is a simple, widely used system that classifies heart failure patients based on the severity of their symptoms during physical activity.
Calculate →PERC Rule
The PERC (Pulmonary Embolism Rule-Out Criteria) rule is a clinical decision rule designed to identify patients at such low risk for pulmonary embolism that diagnostic testing is not necessary.
Calculate →Duke Treadmill
The Duke Treadmill Score (DTS) is a validated prognostic score that estimates the risk of cardiovascular events based on exercise treadmill test parameters, incorporating exercise duration, ST-segment deviation, and angina symptoms.
Calculate →CHADS
The CHADS score is the original clinical prediction tool for estimating stroke risk in patients with non-valvular atrial fibrillation. It combines five risk factors to guide anticoagulation decisions.
Calculate →TIMI UA/NSTEMI
The TIMI UA/NSTEMI risk score is a validated tool for assessing the risk of adverse cardiac events in patients presenting with unstable angina or non-ST elevation myocardial infarction (NSTEMI).
Calculate →HAS-BLED Score
The HAS-BLED score is a clinical tool used to assess 1-year risk of major bleeding in patients with atrial fibrillation who are being considered for anticoagulation therapy.
Calculate →Framingham CVD Risk
The Framingham Risk Score is a widely validated tool for estimating 10-year risk of developing cardiovascular disease, including coronary heart disease, stroke, peripheral artery disease, and heart failure.
Calculate →ASCVD Risk
The ASCVD risk calculator uses the Pooled Cohort Equations to estimate 10-year risk of a first atherosclerotic cardiovascular disease event (MI or stroke) in adults aged 40-79 without known CVD.
Calculate →QTc Calculator
The QTc calculator computes the corrected QT interval using both the Bazett and Fridericia formulas, with gender-specific interpretation thresholds for assessing risk of cardiac arrhythmias.
Calculate →Wells DVT Score
The Wells score for deep vein thrombosis is a validated clinical prediction rule used to estimate the pre-test probability of DVT before imaging, helping to guide the need for D-dimer testing and diagnostic imaging.
Calculate →Wells PE Score
The Wells score for pulmonary embolism is a validated clinical prediction rule used to estimate the pre-test probability of PE, guiding the use of D-dimer testing and diagnostic imaging such as CTPA or V/Q scan.
Calculate →Killip Class
The Killip classification is a simple clinical tool used to classify the severity of heart failure in patients presenting with acute myocardial infarction, providing prognostic information on in-hospital mortality.
Calculate →GRACE Score
The GRACE (Global Registry of Acute Coronary Events) risk score is a validated tool for predicting in-hospital and 6-month mortality in patients presenting with acute coronary syndrome, including ST-elevation MI, non-ST-elevation MI, and unstable angina.
Calculate →LVEF Classification
The left ventricular ejection fraction (LVEF) is a key measurement of cardiac function, representing the percentage of blood ejected from the left ventricle during systole. This classification tool uses standard echocardiographic thresholds to categorize LVEF severity.
Calculate →TIMI Risk Index
The TIMI Risk Index (TRI) is a simplified clinical tool for estimating 30-day mortality risk in patients with ST-elevation myocardial infarction (STEMI). Unlike the full TIMI STEMI score, it uses only three physiological variables — age, heart rate, and systolic blood pressure — making it ideal for rapid bedside risk stratification.
Calculate →INTERHEART Risk
The INTERHEART Risk Score is derived from the landmark INTERHEART study, a global case-control study that identified nine modifiable risk factors accounting for over 90% of the population-attributable risk of myocardial infarction worldwide.
Calculate →HATCH Score
The HATCH score (Hypertension, Age >75, TIA/Stroke, COPD, Heart failure) predicts the risk of progression from paroxysmal to persistent or permanent atrial fibrillation.
Calculate →EFFECT-HF Score
The EFFECT-HF score is a simplified clinical tool for predicting 30-day and 1-year mortality in patients hospitalized with heart failure, based on age, comorbidities, and laboratory values.
Calculate →ACTION Score
The ACTION (Acute Coronary Treatment and Intervention Outcomes Network) Score predicts in-hospital mortality in patients with ST-elevation myocardial infarction (STEMI) using 10 simple clinical variables.
Calculate →CRUSADE Score
The CRUSADE bleeding risk score quantifies in-hospital major bleeding risk in patients with non-ST-segment elevation acute coronary syndromes (NSTE-ACS) using eight clinical variables.
Calculate →SAMe-TT₂R₂
The SAMe-TT₂R₂ score predicts which patients with atrial fibrillation are likely to achieve good time in therapeutic range (TTR) on warfarin, helping guide the choice between warfarin and DOACs.
Calculate →SFSR
The San Francisco Syncope Rule (SFSR) is a clinical decision rule that identifies patients with syncope at high risk for serious 30-day outcomes. It uses 6 clinical predictors to stratify risk in the emergency department setting.
Calculate →
Clinical Guidelines
- ESC Guidelines for the Management of Atrial Fibrillation (2024)
- ACC/AHA Guideline for the Management of Patients With NSTE-ACS (2023)
- ESC Guidelines for Acute Coronary Syndromes (2023)
- CHEST Guideline for Antithrombotic Therapy in VTE (2024)
Frequently Asked Questions
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