Corrected QT (Hodges) Calculator

About this calculator

The Hodges formula (QTc = QT + 1.75 × (heart rate − 60)) is one of several rate-correction methods used to adjust the measured QT interval on an electrocardiogram for the patient's heart rate, alongside the more common Bazett formula (QTc = QT divided by the square root of the RR interval) and the Fridericia and Framingham corrections. Because the QT interval naturally shortens as heart rate rises, clinicians need a rate-independent value to judge whether repolarization is truly prolonged.

Hodges's linear correction is often preferred over Bazett at heart rates far from 60 beats per minute, where Bazett is known to over-correct at fast rates and under-correct at slow rates; it appears in cardiology literature and some ECG software as an alternative correction, particularly when monitoring QT prolongation from certain medications or congenital long QT syndrome.

This calculator takes a measured QT interval and heart rate (or RR interval) and applies the Hodges formula to return the corrected QTc value.