Corrected QT Calculator

The Corrected QT Calculation Tool gives results according to the Bazett Formula.

The QT interval is the time interval from depolarisation to repolarisation of the ventricles of the heart during an electrocardiogram (ECG). Corrected QT (QTc) is a measure of the QT interval corrected for heart rate (RR interval). Several formulae are used to calculate QTc and the most commonly used is the Bazett formula:

QTc = QT / √RR

Here QT is the QT interval in seconds and RR is the RR interval in seconds.

However, the Bazett formula can sometimes be misleading and may not be reliable, especially at high or low heart rates. Some alternative formulae are also available, for example, the Fridericia and Hodges formulae.

You need to know the formula used to calculate QTc and the QT and RR values on the ECG. If you have these values, you can calculate the corrected QT (QTc) using the above formula. However, for any medical application or interpretation, please consult a specialist, because ECG interpretation is a field that requires medical expertise.

Where and How to Use the QT Interval?

The QT interval is used by cardiologists and healthcare professionals for ECG interpretation and assessment of cardiac conditions. People with a long or short QT interval may require specific treatment protocols or further follow-up. Therefore, the QT interval is an important measurement in the assessment of heart health and plays an important role in the follow-up of people with cardiac problems.