CHA2DS2-VASc Score Calculator
Use this tool to estimate stroke risk in non-valvular atrial fibrillation and guide anticoagulation discussions.
Age points are calculated automatically: 65–74 years = +1, 75+ years = +2.
Important: This calculator is for educational use and does not replace professional medical judgment.
What is the CHA2DS2-VASc score?
The CHA2DS2-VASc score is a clinical risk stratification tool used in patients with atrial fibrillation (AF) to estimate annual stroke risk. It improves on the older CHADS2 model by adding additional risk factors and better differentiating lower-risk patients.
Why this score matters
Atrial fibrillation can increase stroke risk because blood may pool in the atria and form clots. The higher the CHA2DS2-VASc score, the greater the expected stroke risk, and the stronger the rationale for discussing anticoagulation therapy.
Scoring criteria
| Risk Factor | Points |
|---|---|
| Congestive heart failure / LV dysfunction | 1 |
| Hypertension | 1 |
| Age ≥ 75 years | 2 |
| Diabetes mellitus | 1 |
| Stroke/TIA/thromboembolism history | 2 |
| Vascular disease | 1 |
| Age 65–74 years | 1 |
| Sex category female | 1 |
How to use this calculator correctly
- Enter age and select sex category.
- Check each clinical risk factor that applies.
- Click Calculate Score to get total points, estimated annual stroke risk, and general treatment direction.
- Use the result as a decision-support aid, not a standalone treatment directive.
Interpreting the result
This tool provides a practical summary aligned with commonly used AF anticoagulation thresholds:
- Lower risk: Usually no anticoagulation needed.
- Intermediate risk: Anticoagulation may be considered based on bleeding risk and patient preference.
- Higher risk: Anticoagulation is generally recommended unless contraindicated.
Estimated annual stroke risk by score
The calculator uses commonly cited approximate rates to provide context. Different cohorts and guidelines may report slightly different percentages.
Clinical nuances and limitations
No risk score captures every clinical variable. Kidney function, frailty, fall risk, history of major bleeding, drug interactions, adherence, and patient values all influence final decisions. In practice, clinicians often pair stroke risk (CHA2DS2-VASc) with bleeding risk tools and shared decision-making.
Important caution
This page does not provide diagnosis or treatment. If you have atrial fibrillation, prior stroke, or concerns about blood thinners, speak with a licensed clinician promptly.
Frequently asked questions
Is this the same as CHADS2?
Not exactly. CHADS2 is older and simpler. CHA2DS2-VASc adds age 65–74, vascular disease, and sex category, improving stroke risk stratification.
Does female sex alone automatically mean anticoagulation?
Usually no. Female sex is treated as a risk modifier; anticoagulation decisions generally depend on additional non-sex stroke risk factors.
Can I use this for valvular atrial fibrillation?
This tool is intended for non-valvular atrial fibrillation contexts. Valvular conditions may require different management pathways.