Corrected QT (QTc) Calculator
Correct the QT interval for heart rate with Bazett
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator applies Bazett's formula, QTc = QT / √RR, where QT is the measured QT interval (in seconds) and RR is the interval between heartbeats (60 divided by heart rate in bpm). Because the QT interval naturally shortens as the heart beats faster, Bazett's square-root correction normalizes it to what it would be at a heart rate of 60 bpm, making QT values comparable across different heart rates.
Cardiologists and ECG technicians use QTc to screen for long QT syndrome and to monitor patients on QT-prolonging medications (certain antibiotics, antipsychotics and antiarrhythmics), since a QTc above roughly 450–470 ms raises the risk of the dangerous arrhythmia torsades de pointes.
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