CHA2DS2-VASc Score Calculator
Estimate stroke risk in patients with atrial fibrillation by selecting the factors below.
What is the CHA2DS2-VASc score?
The CHA2DS2-VASc score is a clinical tool used to estimate stroke risk in people with atrial fibrillation (AF). AF can increase the chance of blood clots forming in the heart, which may travel to the brain and cause stroke. This score helps clinicians decide whether anticoagulation (blood-thinner treatment) is likely to provide net benefit.
How the “chadsvasc 2” calculator works
This calculator follows the classic CHA2DS2-VASc framework. Each risk factor adds points, and the total score corresponds to an estimated annual stroke risk. Higher scores generally mean greater stroke risk and a stronger rationale for preventive therapy.
Point system summary
| Risk Factor | Points |
|---|---|
| Congestive heart failure / LV dysfunction | 1 |
| Hypertension | 1 |
| Age 65–74 | 1 |
| Age ≥ 75 | 2 |
| Diabetes mellitus | 1 |
| Prior stroke / TIA / thromboembolism | 2 |
| Vascular disease (MI, PAD, aortic plaque) | 1 |
| Female sex category | 1 |
Interpreting results in practice
In many guideline frameworks, anticoagulation is generally:
- Recommended when stroke risk is clearly elevated.
- Reasonable to consider at intermediate risk, after shared decision-making.
- Usually not needed at very low risk.
Keep in mind that newer approaches may treat female sex as a risk modifier rather than a standalone trigger. Your clinician may also use related tools or updated guidance depending on region and publication date.
Estimated annual stroke risk by total score
Published estimates vary across cohorts, but commonly cited approximate annual risks are:
| Total Score | Approx. Annual Stroke Risk |
|---|---|
| 0 | ~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% |
FAQ
Is this a diagnosis tool?
No. It is a risk stratification aid for known or suspected atrial fibrillation management planning.
Can I use this if I do not have AF?
It is designed for AF-related stroke risk conversations. Outside that context, it may not be appropriate.
Does a high score guarantee stroke?
No. The score estimates probability, not certainty. It helps compare risk and evaluate prevention options.
Bottom line
A chadsvasc 2 calculator is a fast way to structure stroke risk assessment in atrial fibrillation. Use it as a starting point for an informed conversation with your clinician, not as a substitute for individualized medical advice.