Free Tools

CHA2DS2-VASc & HAS-BLED Calculator

Combined stroke and bleeding risk assessment for atrial fibrillation. ESC 2024-aligned anticoagulation guidance. All calculations run locally in your browser.

CHA2DS2-VASc Stroke risk

Tick all that apply. Age and sex are taken from the fields above.

HAS-BLED Bleeding risk

Tick all that apply. Stroke history and elderly age (>65) are taken from the shared inputs.

Combined Risk Assessment

Disclaimer: This tool is a clinical decision aid, not a substitute for clinical judgment. Verify against current guidelines (ESC 2024 AF; ACC/AHA/ACCP 2023). Always individualise for your patient. CHA2DS2-VASc and HAS-BLED were derived in non-valvular AF; do not use them in moderate/severe mitral stenosis or mechanical valve prostheses, where anticoagulation is mandatory regardless of score.

References

  1. 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. Chest 2010;137(2):263–272.
  2. Pisters R, Lane DA, Nieuwlaat R, de Vos CB, Crijns HJGM, Lip GYH. A novel user-friendly score (HAS-BLED) to assess 1-year risk of major bleeding in patients with atrial fibrillation: the Euro Heart Survey. Chest 2010;138(5):1093–1100.
  3. Van Gelder IC, Rienstra M, Bunting KV, et al. 2024 ESC Guidelines for the management of atrial fibrillation developed in collaboration with the European Association for Cardio-Thoracic Surgery (EACTS). Eur Heart J 2024;45(36):3314–3414.

Managing patients on the go?

Try Dr. Notes — works offline, keeps records secure