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Evaluate stroke risk in non-valvular Atrial Fibrillation (AFib) with this CHADSVASc (CHA2DS2-VASc) score calculator. Instantly calculate risk score and review guideline-based anticoagulation thresholds.
Last updated: March 3, 2026
This tool is for informational purposes only. Do not stop or start taking blood thinners based on this score alone. Always consult with your doctor or cardiologist.
Heart failure signs/symptoms or reduced ejection fraction (+1 point)
Resting BP >140/90 mmHg or on anti-hypertensive drugs (+1 point)
Fasting glucose >125 mg/dL or treated with insulin/drugs (+1 point)
Prior history of Stroke, Transient Ischemic Attack, or Thromboembolism
Prior myocardial infarction, peripheral artery disease, aortic plaque (+1 point)
No antithrombotic therapy is strictly required, but clinical discretion applies.
Disclaimer: This tool is for educational and informational purposes only and does not constitute medical advice. Treatment decisions regarding anticoagulation must carefully weigh bleeding risk (e.g., using HAS-BLED score) and be made by a qualified healthcare professional.
The total score guides physicians in balancing the risk of a life-threatening stroke against the risk of severe bleeding caused by medications.
Patients are generally considered at very low risk for stroke. In most cases, the minor stroke risk does not outweigh the bleeding risk of anticoagulants.
A 'gray area' where treatment decisions are highly individualized. Doctors will discuss patient preferences, access to care, and individual bleeding risks.
Guidelines strongly recommend the use of oral anticoagulants (like DOACs or Warfarin) to actively prevent the high likelihood of stroke.
CHA₂DS₂-VASc is a clinical risk score used in non-valvular atrial fibrillation (AFib) to estimate annual stroke risk. It helps clinicians decide when the benefit of anticoagulation likely outweighs the bleeding risks. In practice, this score supports safer, more consistent, and guideline-aligned treatment planning.
Common search variants: CHADSVASc score calculator, CHADS2VASc calculator, CHA2DS2-VASc score calculator, and CHADVASC calculator.
Converts multiple comorbidities and age tiers into one interpretable score from 0 to 9.
Aligns with modern cardiology recommendations for discussing anticoagulation.
Gives clinicians and patients a concrete baseline for risk-benefit conversations.
The score is additive. Each present risk factor contributes points, and the sum maps to an estimated annual stroke risk.
Note: age tiers are mutually exclusive; only one age group applies.
You can reproduce the score manually in under a minute.
Always pair stroke risk estimation with bleeding-risk and patient-specific clinical judgment.
These examples mirror the calculator's point logic and risk-level interpretation.
Male, age 58, no CHF/HTN/DM/vascular disease, no prior stroke.
Score = 0 -> approximately 0.2% annual stroke risk.
Male, age 68, hypertension, no prior stroke/TIA.
Score = age 65-74 (+1) + HTN (+1) = 2 -> around 2.2% annual risk.
Female, age 77, diabetes, prior TIA.
Score = age 75+ (+2) + diabetes (+1) + prior TIA (+2) + female (+1) = 6 -> about 9.7% annual risk.
Estimated annual stroke rates used in this tool (Friberg cohort references) for quick clinical context.
| CHA₂DS₂-VASc Score | Estimated Annual Stroke Risk | Typical Interpretation |
|---|---|---|
| 0 | 0.2% | Very low risk |
| 1 | 0.6% | Low to moderate (context dependent) |
| 2 | 2.2% | Meaningful stroke risk begins |
| 3 | 3.2% | Moderate-high risk profile |
| 4 | 4.8% | High risk |
| 5 | 7.2% | High risk |
| 6 | 9.7% | Very high risk |
Correct interpretation matters as much as correct scoring.
A patient can only be in one age tier. Use either 65-74 (+1) or 75+ (+2), never both.
Female sex modifies risk, but female sex alone is generally not interpreted the same as multiple independent risk factors.
Stroke prevention decisions should also consider bleeding-risk tools and contraindications.
Recalculate when age category changes or when new comorbidities are diagnosed.
A practical sequence for integrating the score into care discussions.
Enter AFib patient demographics and comorbidities to compute CHA₂DS₂-VASc.
Balance stroke risk against bleeding history, drug interactions, and adherence concerns.
Use score + clinical context to discuss anticoagulation options and follow-up strategy.
A quick and validated way for clinicians and students to calculate AFib risk.
Suggested hashtags: #Cardiology #MedicalApp #AFib #StrokePrevention