Free Cardiology Tools
Clinical-grade calculators and references for healthcare professionals and health-conscious individuals. Completely free, no registration required.
QTc Calculator
Calculate the corrected QT interval using four standard formulas: Bazett, Fridericia, Framingham, and Hodges. Instant clinical interpretation.
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CHA₂DS₂-VASc Score
Estimate stroke risk in atrial fibrillation patients. Get annual stroke risk percentage and anticoagulation recommendations.
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Heart Rate Zones
Calculate your 5 training zones based on age and optional resting heart rate. Uses the Karvonen method for personalized zones.
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BMI & Cardiac Risk
Calculate Body Mass Index with WHO classification and associated cardiovascular risk assessment. Supports metric and imperial units.
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Blood Pressure Checker
Classify blood pressure readings according to the AHA/ACC 2017 guidelines. Get lifestyle and medical recommendations.
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ECG Glossary
Comprehensive A-to-Z reference of 59 electrocardiogram terms, waves, intervals, and diagnoses. Searchable and filterable.
Use Tool →Get Advanced ECG Analysis on Your Wrist
HeartLab delivers clinical-grade ECG analysis directly from your Apple Watch — including QT measurement, arrhythmia detection, and professional medical reports.
