QTc calculator
QTc calculator Summary
QTc calculator is a ad-supported, with in-app purchases Android app in Medical by medsoftpro.ru. Released in Nov 2021 (4 years ago). It has about 3K+ installs Based on AppGoblin estimates, it reaches roughly 167 monthly active users and generates around $<10K monthly revenue (57% IAP / 43% ads). Store metadata: updated Dec 15, 2025.
Recent activity: 16 installs this week (140 over 4 weeks) showing steady growth View trends →
Store info: Last updated on Google Play on Dec 15, 2025 .
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App Description
Corrects the QT interval based on its duration on ECG test and heart rate
The QTc calculator is based on heart rate (pulse rate) in beats per minute and QT interval, either in seconds or miliseconds.
■ Heart rate is defined as the number of subsequent contractions of the heart during one minute, in which blood is pumped from the ventricles to the arteries.
■ The QT interval is a cardiologic term used for the time in the heart’s electrical cycle between the start of the Q wave and the end of the T wave. This is measured in seconds or in miliseconds, the latter for more precision.
QTc formulas
The corrected QT interval is calculated based on the following:
■ Bazett’s formula: QTc = QT/√(RR in seconds)
■ Fridericia’s formula: QTc = QT/(RR0.33)
■ Framingham’s formula: QTc = QT + 0.154(1-RR)
■ Hodges’s formula: QTc = QT + 1.75(HR - 60)
According to the ACC/HRS:
■ Normal values are lower than 450 milliseconds for men and below 460 milliseconds for women;
■ Any QTc value greater than 500 milliseconds is abnormal;
■ Any QTc value lower than 340 milliseconds is abnormal and may indicate short QT syndrome.
After one comparison study, it was concluded that Fridericia and Framingham correction formulas have the best rate correction and significantly improved prediction while Bazett’s formula overestimated QTC prolongation.