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CHA2DS2-Vasc Calculator

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Calculate the CHA2DS2-VASc score for stroke risk in atrial fibrillation, scoring heart failure, hypertension, age, diabetes, prior stroke, and vascular disease.

Reviewed by the thecalcu.com team · Last updated July 11, 2026

Congestive Heart Failure / LV Dysfunction

Hypertension

Age

Diabetes Mellitus

Prior Stroke, TIA, or Thromboembolism

Vascular Disease (MI, PAD, Aortic Plaque)

Sex Category (Female)

CHA2DS2-VASc Score

0/ 9

Risk Category

—

Approx. Annual Stroke Risk0%

Not a substitute for clinical judgment. Anticoagulation decisions for atrial fibrillation must weigh bleeding risk (e.g. HAS-BLED) and individual patient factors — this score alone must never be used to start, stop, or adjust anticoagulation without a qualified healthcare provider.

What is a CHA2DS2-VASc?

The CHA2DS2-VASc Calculator computes the CHA2DS2-VASc score, the standard clinical tool used to estimate stroke risk in people with atrial fibrillation (AFib) and to help inform anticoagulation decisions. The score sums points across seven risk factors, congestive heart failure, hypertension, age, diabetes, prior stroke or thromboembolism, vascular disease, and sex, with older age and prior stroke history weighted more heavily than the other factors.

Select yes or no for each risk factor and choose the appropriate age band, and this calculator returns your total score, an approximate annual stroke risk percentage, and a risk category. For a related vascular-disease screening tool, see the ABI Calculator; for the blood pressure component behind the hypertension risk factor, see the Blood Pressure Calculator.

Why Use a CHA2DS2-VASc Calculator?

Manually adding up seven weighted risk factors and cross-referencing the resulting score against a published stroke-risk table is easy to get wrong, especially with the double-weighted items (age 75+ and prior stroke both count for 2 points). This calculator handles the arithmetic and the lookup instantly, showing exactly which factors contributed to your score.

It's particularly useful for anyone reviewing their own AFib risk factors ahead of a cardiology appointment, or for students memorizing how the score is structured for exams.

Who Should Use This Calculator?

Nursing and medical students studying cardiology or anticoagulation management can use this tool to check worked CHA2DS2-VASc examples against the published scoring criteria. Patients recently diagnosed with atrial fibrillation who want to understand the terminology their cardiologist uses when discussing stroke risk and anticoagulation may also find this a useful educational reference.

Caregivers helping a family member track their AFib-related risk factors before a follow-up appointment can use this tool to organize that information clearly. This calculator is strictly for informational and educational purposes, decisions about starting, stopping, or adjusting anticoagulation therapy carry real bleeding-risk tradeoffs and must be made with a qualified healthcare provider, never from this tool alone.

What Insights Does the CHA2DS2-VASc Calculator Give You?

CHA2DS2-VASc Score is the primary result, your total points out of a possible 9, based on the risk factors you selected.

Risk Category translates that score into a plain-language stroke-risk band (low, low-to-moderate, or moderate-to-high risk), reflecting how most clinical guidelines interpret the score for anticoagulation discussions. Approximate Annual Stroke Risk shows the published population-level annual stroke probability associated with your score, based on the original validation cohort, useful context for understanding what the score actually represents in real-world terms.

How to use this CHA2DS2-VASc calculator

  1. Select Yes or No for Congestive Heart Failure / LV Dysfunction.
  2. Select Yes or No for Hypertension.
  3. Select your Age band, under 65, 65 to 74, or 75 or older.
  4. Select Yes or No for Diabetes Mellitus.
  5. Select Yes or No for Prior Stroke, TIA, or Thromboembolism.
  6. Select Yes or No for Vascular Disease (MI, PAD, Aortic Plaque).
  7. Select Yes or No for Sex Category (Female).
  8. Review your CHA2DS2-VASc Score, Risk Category, and Approximate Annual Stroke Risk, and discuss the result with a qualified healthcare provider if you have or are being evaluated for atrial fibrillation.
Show formula & methodology ↓Show less ↑

Formula & Methodology

The CHA2DS2-VASc score sums the following points:

- Congestive heart failure: 1 point
- Hypertension: 1 point
- Age ≥ 75: 2 points
- Diabetes mellitus: 1 point
- Prior stroke, TIA, or thromboembolism: 2 points
- Vascular disease: 1 point
- Age 65–74: 1 point
- Sex category (female): 1 point

Total score = sum of all applicable points (maximum 9)

Worked example: A 76-year-old woman with hypertension and no other risk factors scores: Age ≥75 (2 points) + Hypertension (1 point) + Female sex (1 point) = 4 points total, placing her in the moderate-to-high risk category where anticoagulation is generally recommended, per published CHA2DS2-VASc risk tables (Lip et al., Chest, 2010).

Frequently Asked Questions

What does CHA2DS2-VASc stand for?
CHA2DS2-VASc is an acronym for the risk factors it scores: Congestive heart failure, Hypertension, Age ≥75 (2 points), Diabetes, prior Stroke/TIA/thromboembolism (2 points), Vascular disease, Age 65–74, and Sex category female. Each factor contributes points toward a total score used to estimate stroke risk in people with atrial fibrillation.
What is the CHA2DS2-VASc score used for?
It's used to estimate the annual risk of stroke in patients with atrial fibrillation (AFib) and to help guide decisions about whether blood-thinning medication (anticoagulation) is appropriate. Higher scores indicate higher stroke risk and generally strengthen the case for anticoagulation therapy.
What is considered a low, moderate, or high CHA2DS2-VASc score?
A score of 0 (or 1 from female sex alone) is generally considered low risk, where anticoagulation is often not recommended. A score of 1 in men is considered low-to-moderate risk where anticoagulation may be considered, while a score of 2 or higher is generally considered moderate-to-high risk, where anticoagulation is typically recommended in most guidelines.
Why does being female add a point even without other risk factors?
Research has shown that female sex is an independent risk-modifying factor for stroke in atrial fibrillation, meaning it slightly increases risk when combined with other factors, even though it isn't usually treated as a stand-alone risk factor on its own. This is why a score of 1 from sex category alone is still classified as low risk in most clinical guidance.
Why is a prior stroke worth 2 points instead of 1?
A prior stroke, transient ischemic attack (TIA), or thromboembolism is one of the strongest predictors of a future stroke, so it carries double weight compared to most other risk factors in the scoring system. The same double weighting applies to age 75 and older, reflecting the substantially higher stroke risk in that age group.
Is CHA2DS2-VASc the same as the older CHADS2 score?
CHA2DS2-VASc is an expanded version of the earlier CHADS2 score, adding vascular disease, age 65–74, and female sex as additional risk factors while also increasing the weight given to age 75+. It's now the more widely recommended tool because it better identifies truly low-risk patients.
Does a high score mean I will definitely have a stroke?
No, the score estimates an approximate annual probability of stroke based on population data, not a certainty for any individual. It's one input clinicians use alongside bleeding risk, patient preference, and other health factors when deciding on anticoagulation therapy.
Can this calculator tell me whether I should take blood thinners?
No, this calculator is for informational and educational purposes only and simply reproduces the published CHA2DS2-VASc scoring system. Anticoagulation decisions carry real bleeding-risk tradeoffs and must be made by a qualified healthcare provider who can weigh your full medical history, not by this tool alone.
What counts as vascular disease in this score?
Vascular disease in the CHA2DS2-VASc score includes prior myocardial infarction (heart attack), peripheral artery disease, or evidence of aortic plaque on imaging. If you're unsure whether a prior diagnosis qualifies, ask your physician rather than guessing when using this calculator.
How accurate is the annual stroke risk percentage shown?
The percentages shown come from the original Lip et al. 2010 validation study published in Chest, which remains a widely cited reference table in ESC and ACC/AHA guidelines. Real-world risk can vary based on additional factors like anticoagulation adherence, blood pressure control, and other comorbidities not captured in this score alone.
How is this different from the ABI Calculator?
The [ABI Calculator](/abi-calculator/) screens for peripheral artery disease using a leg-to-arm blood pressure ratio, which is unrelated to atrial fibrillation stroke risk. Vascular disease detected through tools like the ABI Calculator can, however, feed into the CHA2DS2-VASc score as one of its risk factors.
Also known as
CHA2DS2-VASc score calculatoratrial fibrillation stroke risk calculatorAFib anticoagulation score calculatorstroke risk in atrial fibrillation calculatorCHADS-VASc calculator