CHA₂DS₂-VASc score calculator
Tick the conditions that apply to get the CHA₂DS₂-VASc score used to estimate stroke risk in atrial fibrillation, together with the CHA₂DS₂-VA score without the sex point. It is an estimate for information, not a diagnosis or a treatment decision.
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How to use it
- Choose the age band and sex.
- Tick each condition that has been diagnosed.
- Read the CHA₂DS₂-VASc score, the risk group and the CHA₂DS₂-VA score.
How the score is added up
| Item |
Points |
| Congestive heart failure (C) |
1 |
| Hypertension (H) |
1 |
| Age 75 or older (A₂) |
2 |
| Diabetes (D) |
1 |
| Stroke, TIA or thromboembolism (S₂) |
2 |
| Vascular disease (V) |
1 |
| Age 65–74 (A) |
1 |
| Female sex (Sc) |
1 |
CHA₂DS₂-VA is the same sum without the sex point. The risk group comes from that sex-free score: 0 low, 1 intermediate, 2 or more high.
Worked example
A 78-year-old woman with high blood pressure and no other conditions: age 75+ gives 2, hypertension 1 and female sex 1, so CHA₂DS₂-VASc = 4. Without the sex point the CHA₂DS₂-VA score is 3, so she is in the high group.
A 70-year-old man with no other conditions scores 1 (age 65–74), intermediate.
Tips
- Count a condition once even if it fits more than one description; stroke and TIA together still give 2 points.
- Age moves people between bands: recalculate after a birthday at 65 or 75.
- The score is designed for atrial fibrillation not caused by a mechanical valve or moderate to severe mitral stenosis.
- This is an estimate for information, not a diagnosis or a treatment decision.
Frequently asked questions
What does each letter stand for?
C congestive heart failure (1), H hypertension (1), A₂ age 75 or older (2), D diabetes (1), S₂ previous stroke, TIA or thromboembolism (2), V vascular disease (1), A age 65 to 74 (1) and Sc sex category, female (1). The maximum is 9.
How are the risk groups set?
The calculator uses the usual split: low is 0 for men or 1 for women, intermediate is 1 for men or 2 for women, high is 2 or more for men or 3 or more for women. Put simply, the group comes from the score without the sex point: 0, 1, or 2 and above.
What is CHA₂DS₂-VA?
The same score without the point for female sex. Recent European guidance prefers it because female sex adds risk only together with other factors. The calculator shows both.
Does a high score mean I need a blood thinner?
Not automatically. The score is one part of the decision; bleeding risk, kidney function, other medicines and your own preferences matter too. Only your doctor can weigh them.