QTc (Bazett's Formula)
QT:
RR:
or
HR: /min

QTc:
ms
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Warning! This site it targeted at medical professionals and medical students only. No claims are made of the accuracy of this calculator. Always confirm the results of this calculator before use. Never use the results of this calculator alone as a guide to patient care, always trust your clinical judgement. The authors of this calculator shall not be liable for damages resulting from use of this calculator.

This calculator calculates the corrected QT interval using Bazett's formula:

QTc = QT / √ RR

When entering the QT-interval and the RR-interval in millimeters, make sure the ECG is recorded at a speed of 25mm/sec. Normal values are between 300 and 450ms. At a longer corrected QT interval, the patient is at risk for torsade de pointes.

References: