Clinical Resources
Validated calculators and decision aids for healthcare providers
General Cardiology Calculators
Adult GFR
2021 CKD-EPI Creatinine Equation — estimates glomerular filtration rate and CKD stage. Essential for dosing renally-cleared medications.
OpenASCVD 10-Year Risk
Pooled Cohort Equations to estimate 10-year risk of a first atherosclerotic cardiovascular event (MI, stroke, CHD death).
OpenCHA₂DS₂-VASc Score
Ischemic stroke risk stratification for atrial fibrillation patients, with annual stroke/TE rate and anticoagulation recommendation.
OpenCorrected QT Interval
Calculate QTc using five validated formulas: Bazett, Fridericia, Framingham, Hodges, and Rautaharju. Includes adjustment for wide QRS.
OpenCreatinine Clearance
Cockcroft-Gault equation using actual and ideal body weight — critical for anticoagulant and antiarrhythmic drug dosing.
OpenHAS-BLED Score
Major bleeding risk estimation for patients on anticoagulation — guides risk-benefit discussion in atrial fibrillation management.
OpenIdeal Body Weight
Devine formula for IBW plus adjusted body weight for obese patients — used in drug dosing and ventilator calculations.
OpenElectrophysiology Algorithms
Advanced ECG Caliper
Upload or paste an ECG image to measure intervals precisely. Calculates QTc from caliper measurements. Best in landscape mode on mobile.
OpenAtrial Tachycardia Localization
Step-by-step P-wave morphology algorithm to localize the origin of atrial tachycardias (crista terminalis, TV annulus, PVs, CS, etc.).
OpenBrugada Criteria for WCT
Modified Brugada criteria — 4-step algorithm to differentiate ventricular tachycardia from SVT with aberrant conduction.
OpenEasy WPW – AP Localization
Simplified algorithm for accessory pathway localization in WPW syndrome using delta wave polarity and QRS transition.
OpenIdiopathic VT Origin
Determine the likely anatomic origin of idiopathic ventricular arrhythmias using QRS axis, transition, and morphology features.
OpenIschemic VT Reentry Circuit
Pacing-based algorithm to identify VT reentry circuit location using entrainment maneuvers (concealed vs. overt fusion, PPI-TCL).
OpenDisclaimer: Please ensure that all calculations are verified prior to clinical use. The authors do not guarantee the accuracy of the information provided, and all results should not replace clinical judgment. These tools are intended to support — not substitute — professional medical decision-making.