Corrected QT Interval (QTc) Calculator
Calculate the corrected QT interval using Bazett, Fridericia, Framingham, and Hodges formulas from QT interval and heart rate.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Normal QT: 350–440 ms; prolonged QTc: >450 ms (male) or >470 ms (female) per AHA
Normal HR: 60–100 bpm; Bazett formula most accurate 60–100 bpm (less so at extremes)
Results
QTc (Bazett)
438ms
QTc (Fridericia)
425ms
How to Use This Calculator
- Enter the measured QT interval (ms) and heart rate (bpm).
- Review QTc by Bazett, Fridericia, Framingham, and Hodges formulas.
- Bazett is most widely used clinically; Fridericia is preferred at extreme heart rates.
- QTc > 500 ms by any formula is critically prolonged.
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