Cha2ds2 Vasc Calculator
Cha2ds2 vasc calculator works out Score and Maximum possible from Score, Age and Sex. The default figures on this page give score of 3; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Scoring with CHA2DS2-VASc (maximum 9).
- Hypertension +1, Age 65 to 74 +1, Female sex +1.
- Total = 3.
- Swedish Atrial Fibrillation cohort (Friberg 2012, n = 182,678, without anticoagulation); annual ischaemic stroke rate: 3.2% at a score of 3.
Points scoredtable
| criterion | letter | points | maximum | met |
|---|---|---|---|---|
| Congestive heart failure or LV systolic dysfunction | C | 0 | 1 | No |
| Hypertension | H | 1 | 1 | Yes |
| Age 75 or older | A2 | 0 | 2 | No |
| Diabetes mellitus | D | 0 | 1 | No |
| Prior stroke, TIA or thromboembolism | S2 | 0 | 2 | No |
| Vascular disease | V | 0 | 1 | No |
| Age 65 to 74 | A | 1 | 1 | Yes |
| Female sex | Sc | 1 | 1 | Yes |
Its 5 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
5 sources
What the cha2ds2 vasc calculator calculates
Scores stroke risk in non-valvular atrial fibrillation by CHA2DS2-VASc, CHADS2 or the 2024 ESC CHA2DS2-VA, itemises which criteria contributed, and reports the published annual stroke rate for that score together with the cohort it came from.
How to use this cha2ds2 vasc calculator
Enter Score, Age, Sex and Congestive heart failure or left-ventricular systolic dysfunction. Score updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Score, Maximum possible and Score used.
The method follows Gage BF, Waterman AD, Shannon W, et al. Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation, Lip GYH, Nieuwlaat R, Pisters R, Lane DA, Crijns HJGM. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: the Euro Heart Survey on Atrial Fibrillation, Friberg L, Rosenqvist M, Lip GYH. Evaluation of risk stratification schemes for ischaemic stroke and bleeding in 182,678 patients with atrial fibrillation: the Swedish Atrial Fibrillation cohort study, 2020 ESC Guidelines for the diagnosis and management of atrial fibrillation (with EACTS) and 2024 ESC Guidelines for the management of atrial fibrillation (with EACTS).
72-year-old woman with hypertension and diabetes example
With Score: cha2ds2-vasc, Age: 72, Sex: female, Hypertension (history, or on treatment): true, the calculator returns Score: 4, Maximum possible: 9, Published annual stroke rate: 4.8. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Score, Maximum possible and Score used. The inputs you can vary are Score, Age, Sex, Congestive heart failure or left-ventricular systolic dysfunction, Hypertension (history, or on treatment) and Diabetes mellitus.
Understanding Score, Maximum possible and Score used
A risk score, not a treatment decision. The published rates come from specific historical cohorts of patients who were not anticoagulated and may not describe any individual today. Whether to anticoagulate is a clinical decision that also weighs bleeding risk, kidney function and patient preference.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How do I interpret my CHA2DS2-VASc score?
Scores stroke risk in non-valvular atrial fibrillation by CHA2DS2-VASc, CHADS2 or the 2024 ESC CHA2DS2-VA, itemises which criteria contributed. Open “How this is worked out” beside the result to see each step for your own figures.
What is considered a high CHA2DS2-VASc score?
Scores stroke risk in non-valvular atrial fibrillation by CHA2DS2-VASc, CHADS2 or the 2024 ESC CHA2DS2-VA, itemises which criteria contributed. On this page it is computed from Score, Age and Sex and shown as Score, Maximum possible and Score used.
What are the new guidelines for CHA2DS2-VA scores?
On the figures this page opens with — age 72 years — the score is 3. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What does a CHA2DS2-VASc score of 1 mean?
It needs Score, Age, Sex, Congestive heart failure or left-ventricular systolic dysfunction, Hypertension (history, or on treatment) and Diabetes mellitus. Nothing else is required, and the figures stay in your browser.
What information do I need for the cha2ds2 vasc calculator?
You need Score, Age, Sex, Congestive heart failure or left-ventricular systolic dysfunction, Hypertension (history, or on treatment), Diabetes mellitus, Prior stroke, TIA or thromboembolism and Vascular disease (prior MI, peripheral artery disease or aortic plaque). The page opens with default figures that give score of 3, so you can see the scale before entering your own.
What does this cha2ds2 vasc calculator show?
It shows Score, Maximum possible, Score used, Published annual stroke rate, Rate taken from, Risk category, Against the guideline threshold and Points scored, with the working and any warnings for your entries.