CHA2DS2-VASc Calculator — AF Stroke Risk (ACC/AHA 2023)

Q: What does CHA2DS2-VASc stand for?

Congestive heart failure (1), Hypertension (1), Age ≥ 75 years (2), Diabetes (1), prior Stroke, TIA or thromboembolism (2), Vascular disease (1), Age 65–74 years (1) and Sex category female (1). The maximum score is 9.

Q: At what CHA2DS2-VASc score is anticoagulation recommended?

Under the 2023 ACC/AHA/ACCP/HRS guideline, anticoagulation is recommended when the estimated annual thromboembolic risk is at least 2% — for example a score of 2 or more in men or 3 or more in women (Class 1). At a risk of 1% to under 2% — a score of 1 in men or 2 in women — anticoagulation is reasonable (Class 2a).

Q: Why do women need a higher score for the same recommendation?

Female sex adds a point but is treated as a risk modifier rather than a risk factor on its own: a woman with no other risk factor is still low risk. That is why the thresholds are one point higher for women.

Q: What is the CHA2DS2-VA score?

It is the same score without the sex point, used by the 2024 European Society of Cardiology AF guideline. Under ESC 2024, anticoagulation is recommended at a CHA2DS2-VA score of 2 or more and can be considered at 1, regardless of sex.

Q: Should aspirin be used instead of an anticoagulant?

No. The 2023 guideline advises against aspirin, alone or with clopidogrel, as an alternative to anticoagulation in patients who are candidates for it, and finds no benefit from aspirin in AF patients without stroke risk factors. Direct oral anticoagulants are preferred over warfarin for most patients.

Q: Does a high bleeding-risk score mean no anticoagulation?

Not by itself. The guideline says bleeding-risk scores such as HAS-BLED should not be used in isolation to decide eligibility for anticoagulation; they are better used to find and correct modifiable bleeding risks.

Written and reviewed by the Kinase Medical Team · Last reviewed 30 September 2026

Quick Answer

CHA₂DS₂-VASc scores CHF 1, Hypertension 1, Age ≥ 75 2, Diabetes 1, Stroke/TIA 2, Vascular disease 1, Age 65–74 1 and female Sex 1 (maximum 9). Per the 2023 ACC/AHA/ACCP/HRS guideline, anticoagulation is recommended at ≥ 2 in men or ≥ 3 in women and reasonable at 1 in men or 2 in women.

How it's calculated

The guideline defines the items as in the original score: heart failure needs clinical features with objective evidence of cardiac dysfunction; hypertension is BP above 140/90 mmHg on two occasions or current treatment; diabetes is fasting glucose ≥ 7.0 mmol/L (126 mg/dL) or treatment; thromboembolism includes ischaemic stroke, TIA, peripheral embolism or pulmonary embolism; vascular disease is coronary artery disease (prior MI, angina, PCI or CABG) or peripheral arterial disease.

How to interpret the result

2023 ACC/AHA/ACCP/HRS Guideline for the Diagnosis and Management of Atrial Fibrillation, sections 6.1 and 6.3.1.
Men	Women	Estimated annual risk	Recommendation
0	1	Low (under ~1%)	No anticoagulation recommendation; aspirin is of no benefit
1	2	Intermediate (1% to < 2%)	Anticoagulation is reasonable (Class 2a); shared decision, weigh risk modifiers such as AF burden
≥ 2	≥ 3	High (≥ 2%)	Anticoagulation recommended (Class 1); DOAC preferred over warfarin for most patients

Worked example

A 70-year-old woman with atrial fibrillation, hypertension and type 2 diabetes.

Age 65–74 = 1, hypertension = 1, diabetes = 1, female = 1 → CHA₂DS₂-VASc 4. For a woman, ≥ 3 means an estimated risk of at least 2% a year → anticoagulation recommended. Her CHA₂DS₂-VA score is 3.

A 60-year-old woman with AF and no other risk factor scores 1 (the sex point only) → low risk. A 68-year-old man with no other risk factor also scores 1 → intermediate risk, where anticoagulation is reasonable.

Limitations and common pitfalls

Sources

For learning — not for clinical decisions. Reference ranges and cut-offs vary between laboratories and guidelines.

Frequently Asked Questions

What does CHA2DS2-VASc stand for?▼

Congestive heart failure (1), Hypertension (1), Age ≥ 75 years (2), Diabetes (1), prior Stroke, TIA or thromboembolism (2), Vascular disease (1), Age 65–74 years (1) and Sex category female (1). The maximum score is 9.

At what CHA2DS2-VASc score is anticoagulation recommended?▼

Under the 2023 ACC/AHA/ACCP/HRS guideline, anticoagulation is recommended when the estimated annual thromboembolic risk is at least 2% — for example a score of 2 or more in men or 3 or more in women (Class 1). At a risk of 1% to under 2% — a score of 1 in men or 2 in women — anticoagulation is reasonable (Class 2a).

Why do women need a higher score for the same recommendation?▼

Female sex adds a point but is treated as a risk modifier rather than a risk factor on its own: a woman with no other risk factor is still low risk. That is why the thresholds are one point higher for women.

What is the CHA2DS2-VA score?▼

It is the same score without the sex point, used by the 2024 European Society of Cardiology AF guideline. Under ESC 2024, anticoagulation is recommended at a CHA2DS2-VA score of 2 or more and can be considered at 1, regardless of sex.

Should aspirin be used instead of an anticoagulant?▼

No. The 2023 guideline advises against aspirin, alone or with clopidogrel, as an alternative to anticoagulation in patients who are candidates for it, and finds no benefit from aspirin in AF patients without stroke risk factors. Direct oral anticoagulants are preferred over warfarin for most patients.

Does a high bleeding-risk score mean no anticoagulation?▼