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CHA₂DS₂-VASc Score Calculator

Estimate stroke risk in non-valvular atrial fibrillation to support anticoagulation decisions.

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Risk factors

Select one.

Select one.

Educational use only. Stroke-risk tools support decision-making but do not replace clinical judgement or local guidelines.

How it works

CHA₂DS₂-VASc assigns points to common stroke risk factors in atrial fibrillation (AF). The total score provides a simple estimate of stroke risk and helps guide anticoagulation decisions.

The result should be interpreted with guideline thresholds, patient preferences, bleeding risk, and clinical context. This page is for education and cross-checking only.

Formula

CHA₂DS₂-VASc = C + H + A₂ + D + S₂ + V + A + Sc C CHF/LV dysfunction: +1 H Hypertension: +1 A₂ Age ≥75 years: +2 D Diabetes: +1 S₂ Prior stroke/TIA/TE: +2 V Vascular disease: +1 A Age 65–74 years: +1 Sc Sex category (female): +1

Worked examples

Example 1: Male, 68 years, hypertension

H: +1 (Hypertension) A (65–74): +1 Total = 1 + 1 = 2
Answer: CHA₂DS₂-VASc = 2

Example 2: Female, 78 years, diabetes, prior TIA

A₂ (≥75): +2 D: +1 (Diabetes) S₂: +2 (Prior TIA) Sc: +1 (Female) Total = 2 + 1 + 2 + 1 = 6
Answer: CHA₂DS₂-VASc = 6

Example 3: Male, 59 years, no risk factors

No points selected. Total = 0
Answer: CHA₂DS₂-VASc = 0

Clinical safety note: CHA₂DS₂-VASc is for non-valvular AF risk stratification. Anticoagulation decisions must follow local guidelines and consider bleeding risk, contraindications, and shared decision-making.

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Frequently asked questions

Clinical reminder: Always follow local protocols and consult medication information sheets. These examples are for calculation practice only.

References & Sources

Use these references for guideline thresholds and clinical decision pathways.

Guidelines

ESC Guidelines for Atrial Fibrillation (risk assessment & anticoagulation)

Guideline

European Society of Cardiology

Comprehensive AF guideline including stroke risk assessment and anticoagulation pathways.

ACC/AHA/HRS Atrial Fibrillation Guideline (stroke prevention)

Guideline

American Heart Association / ACC / HRS

US guideline recommendations for anticoagulation and stroke prevention in AF.

Score development & validation

CHA₂DS₂-VASc score development/validation (PubMed)

PubMed

Stroke risk stratification in AF

Background literature supporting CHA₂DS₂-VASc use and validation across cohorts.

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