Last updated April 12, 2025

CHA₂DS₂-VASc Score Calculator

Also Known as: Stroke Risk Calculator for Atrial Fibrillation, CHA2DS2-VASc Stroke Risk Assessment Tool, Atrial Fibrillation Stroke Risk Calculator, AFib Stroke Risk Score Calculator, CHA2DS2-VASc Risk Stratification Tool, Anticoagulation Decision Calculator for AFib, CHA2DS2-VASc Clinical Score Calculator, Stroke Prevention Calculator for AFib, CHA2DS2-VASc Risk Estimator, Atrial Fibrillation Thrombosis Risk Calculator, CHA2DS2-VASc Prognostic Score Tool, AFib Stroke Probability Calculator, CHA2DS2-VASc Anticoagulation Guidance Tool, Cardiac Stroke Risk Assessment Calculator

Disclaimer This CHA₂DS₂-VASc Score Calculator provides estimates based on established clinical guidelines. It is not a substitute for professional medical judgment. Treatment decisions should consider individual patient factors and be made in consultation with a qualified healthcare provider. Use this tool at your own discretion.

01 What is a CHA₂DS₂-VASc Score Calculator?

The CHA₂DS₂-VASc Score Calculator is a clinical tool used to estimate stroke risk in patients with atrial fibrillation (AFib). It assigns points for specific risk factors (congestive heart failure, hypertension, age, diabetes, stroke history, vascular disease, and sex) to determine the need for anticoagulation therapy.

02 How Does the CHA₂DS₂-VASc Score Calculator Work?

The calculator assigns points as follows:

Congestive heart failure: 1 point
Hypertension: 1 point
A₂ge ≥75: 2 points
Diabetes: 1 point
S₂troke/TIA history: 2 points
Vascular disease: 1 point
Age 65-74: 1 point
Sc (female sex): 1 point
The total score correlates with annual stroke risk and guides anticoagulation decisions.

03 Why is the CHA₂DS₂-VASc Score Important?

This score helps clinicians stratify stroke risk in AFib patients and make evidence-based decisions about anticoagulation therapy, balancing stroke prevention against bleeding risks.

04 What Do the Different Score Ranges Mean?

Score 0 (men) or 1 (women): Low risk (~0-1.3% annual stroke risk)
Score 1 (men): Moderate risk (~1.3-2.2%)
Score ≥2 (men) or ≥3 (women): High risk (~2.2-15.2%)

05 How Accurate is the CHA₂DS₂-VASc Calculator?

The calculator has good predictive accuracy (c-statistic ~0.6-0.7), though individual factors like labile INRs or extreme ages may affect precision. It’s validated in multiple international guidelines.

06 Why Does Gender Affect the Scoring?

Female sex adds 1 point due to studies showing women with AFib have slightly higher stroke risks than men after adjusting for other factors. However, sex alone shouldn’t dictate treatment.

07 How Should Age Be Scored?

Age is categorized:

65-74 years = 1 point
≥75 years = 2 points
These aren’t additive – a 78-year-old would only get 2 points, not 3 (1 for 65-74 + 2 for ≥75).

08 What Counts as Vascular Disease?

Vascular disease includes:

Prior myocardial infarction
Peripheral artery disease
Aortic plaque
Carotid artery disease

09 How Often Should the Score Be Recalculated?

Recalculate annually or when:

New risk factors emerge
After stroke/TIA events
When considering anticoagulation changes

10 What Are the Anticoagulation Recommendations?

Score 0 (men)/1 (women): No anticoagulation typically needed
Score 1 (men): Consider anticoagulation based on bleeding risk
Score ≥2 (men)/≥3 (women): Anticoagulation recommended in most cases

11 Does This Calculator Replace Clinical Judgment?

No. The score informs but doesn’t replace judgment. Factors like bleeding risk, patient preferences, and fall risk must also be considered when prescribing anticoagulants.