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CHA2DS2-VASc / HAS-BLED Calculator

Calculate stroke and bleeding risk scores for atrial fibrillation.

About CHA2DS2-VASc / HAS-BLED Calculator

Age contributes two points from 75 and one from 65, and prior stroke contributes two. HAS-BLED is intended to prompt correction of modifiable bleeding risks rather than to rule out anticoagulation. A high HAS-BLED score is not a reason to withhold anticoagulation, since absolute stroke reduction usually exceeds absolute bleeding increase in those at high stroke risk.

Formula

CHA2DS2-VASc / HAS-BLED

CHA2DS2-VASc sums weighted risk factors; HAS-BLED sums bleeding risk factors

CHA2DS2-VASc
Congestive failure, hypertension, age, diabetes, stroke, vascular disease, sex
HAS-BLED
A bleeding risk score used to identify modifiable factors, not to withhold treatment

Worked example

With the default values below, CHA2DS2-VASc / HAS-BLED Calculator returns CHA2DS2-VASc Score of 4. Change any input above and every figure here is recalculated in your browser.

Inputs used

Ageaccepts 18–110 years
72 years
Sexone of Male, Female
Female
CHA2DS2-VASc risk factors present besides age and sexaccepts 0–6
2
Prior stroke, TIA or thromboembolismone of Yes, No
No
HAS-BLED factors presentaccepts 0–9
2

Results

CHA2DS2-VASc Score
4 /9
HAS-BLED Score
2 /9
Published Annual Stroke Risk
4.80%
Bleeding Risk Band
Moderate
Points From Age
1

Step by step

  1. 1Values used
  2. 2CHA2DS2-VASc / HAS-BLED
  3. 3CHA2DS2-VASc Score= 4 /9
  4. 4HAS-BLED Score= 2 /9
  5. 5Published Annual Stroke Risk= 4.80
  6. 6Bleeding Risk Band= Moderate
  7. 7Points From Age= 1

Assumptions and limits

  • The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This reproduces a published formula for educational and reference use only. It is not a diagnostic tool, does not account for individual clinical context, and must not be used to make or change treatment decisions. Clinical assessment by a qualified healthcare professional is always required. Anticoagulation decisions require full clinical assessment and shared decision making with a qualified clinician. Do not start, stop or change anticoagulant medication based on any score.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

This reproduces a published formula for educational and reference use only. It is not a diagnostic tool, does not account for individual clinical context, and must not be used to make or change treatment decisions. Clinical assessment by a qualified healthcare professional is always required. Anticoagulation decisions require full clinical assessment and shared decision making with a qualified clinician. Do not start, stop or change anticoagulant medication based on any score.

Frequently Asked Questions

How is CHA2DS2-VASc / HAS-BLED calculated?

CHA2DS2-VASc sums weighted risk factors; HAS-BLED sums bleeding risk factors Age contributes two points from 75 and one from 65, and prior stroke contributes two. HAS-BLED is intended to prompt correction of modifiable bleeding risks rather than to rule out anticoagulation.

Why does CHA2DS2-VASc / HAS-BLED matter?

A high HAS-BLED score is not a reason to withhold anticoagulation, since absolute stroke reduction usually exceeds absolute bleeding increase in those at high stroke risk.

What values do I need to enter?

This calculator takes 5 inputs: Age, Sex, CHA2DS2-VASc risk factors present besides age and sex, Prior stroke, TIA or thromboembolism, HAS-BLED factors present. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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