CHA2DS2-VASc Calculator
Estimate stroke risk in atrial fibrillation with the CHA2DS2-VASc score, which counts heart failure, hypertension, age, diabetes, prior stroke, vascular disease and sex. Example: a 70-year-old man with hypertension scores 2 (1 for age 65 to 74 and 1 for hypertension).
Show steps
How to use the CHA2DS2-VASc Calculator
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
Score = congestive heart failure (1) + hypertension (1) + age 75+ (2) + diabetes (1) + stroke/TIA/embolism (2) + vascular disease (1) + age 65 to 74 (1) + female sex (1). Maximum 9.
Scoring
| Factor | Points |
|---|---|
| Congestive heart failure | 1 |
| Hypertension | 1 |
| Age 75 or older | 2 |
| Diabetes | 1 |
| Stroke, TIA or thromboembolism | 2 |
| Vascular disease | 1 |
| Age 65 to 74 | 1 |
| Female sex | 1 |
Stroke risk by score (approximate, per year)
| Score | Annual stroke risk |
|---|---|
| 0 | 0% |
| 1 | 1.3% |
| 2 | 2.2% |
| 3 | 3.2% |
| 4 | 4.0% |
| 5 | 6.7% |
| 6 | 9.8% |
| 7 | 9.6% |
| 8 | 6.7% |
| 9 | 15.2% |
What guidelines suggest
ESC 2020 guidance recommends anticoagulation at a score of 2 or more in men and 3 or more in women, and suggests considering it at 1 in men and 2 in women.
Bleeding risk
Bleeding risk (for example HAS-BLED) is assessed separately and mainly identifies risks that can be modified. This calculator is for education and is not medical advice. Decisions about diagnosis and treatment belong with a qualified clinician.
Frequently asked questions
What does CHA2DS2-VASc stand for?
Congestive heart failure, Hypertension, Age 75+, Diabetes, Stroke, Vascular disease, Age 65-74, Sex category.
What score needs a blood thinner?
2 or more in men and 3 or more in women, per ESC 2020.
Is the score used outside atrial fibrillation?
No, it is for non-valvular atrial fibrillation.
Why does sex count?
Women have a higher risk when other factors are present.
What is the maximum score?
9.
Does a score of 0 mean no risk?
Risk is low but not zero.
Sources
- Lip et al., Chest 2010: Refining clinical risk stratification in AF
- Hindricks et al., ESC 2020 AF guidelines
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