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This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.

QTc calculator

QT interval and heart rate → QTc according to Bazett, Fridericia, Hodges and Framingham, with pediatric reference values

ECG measurement
Used only if no heart rate is entered.
Classification against reference values (optional)
Sex

Frequently asked questions

QTc calculator: What does this calculator compute?

QTc according to Bazett, Fridericia, Hodges and Framingham from QT interval and heart rate (or RR interval) – with pediatric reference values (P2–P98 by age and sex, Saarel 2018) and the diagnostic threshold of the ESC guideline.

QTc calculator: Which sources is this calculator based on?

Bazett HC: An analysis of the time-relations of electrocardiograms (Heart 7:353–370) (1920); Fridericia LS: The duration of systole in the electrocardiogram in normal persons and in heart patients (Acta Med Scand 53:469–486) (1920); Hodges M, Salerno D, Erlien D: Bazett's QT correction reviewed: evidence that a linear QT correction for heart rate is better (J Am Coll Cardiol 1:694) (1983); Sagie A, Larson MG, Goldberg RJ, Bengtson JR, Levy D: An improved method for adjusting the QT interval for heart rate (the Framingham Heart Study) (Am J Cardiol 70:797–801) (1992); Saarel EV, Granger S, Kaltman JR et al., Pediatric Heart Network: Electrocardiograms in Healthy North American Children in the Digital Age (Circ Arrhythm Electrophysiol 11:e005808) – Table 2: QTc (Bazett, lead II) by age and sex (2018); Zeppenfeld K, Tfelt-Hansen J, de Riva M et al., European Society of Cardiology: 2022 ESC Guidelines for the management of patients with ventricular arrhythmias and the prevention of sudden cardiac death (Eur Heart J 43:3997–4126) (2022)