QTc Calculator
Calculate corrected QT interval from QT and heart rate.
QTc Form
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Understanding Your Results
Corrected QT interval accounts for heart rate. Bazett’s formula is most common; Fridericia’s is more accurate at extreme heart rates. QTc >500 ms carries high torsades risk.
- Normal: QTc <470 ms (men) or <480 ms (women).
- Borderline prolonged: 470–500 ms. Monitor and review medications.
- High risk: >500 ms. Elevated risk of Torsades de Pointes.
Learn More
- How to Interpret QTc Interval Results
- Living With QTc Interval
- QTc Interval Diagnosis and Tests
- QTc Interval Myths and Facts
- QTc Interval Risk Factors
- QTc Interval Symptoms and Causes
- QTc Interval Treatment Options
- QTc Interval vs Electrolyte Panel
- What Is the QTc Interval?
- When to See a Doctor About QTc Interval
Frequently Asked Questions
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Medical Disclaimer: This calculator is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for personalized guidance.