Corrected QT Interval (QTc)

Heart-rate-corrected QT interval, shown by both the Bazett and Fridericia formulas.

For healthcare professionals.These calculate a score or a measurement from values you enter. They do not diagnose, and they are no substitute for clinical judgement. If you are a patient, discuss any result with your own doctor rather than acting on it.

Measured QT intervalms

Heart ratebpm

Sex

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Source

Bazett HC. An analysis of the time-relations of electrocardiograms. Heart. 1920;7:353-370.
Fridericia LS. Die Systolendauer im Elektrokardiogramm bei normalen Menschen und bei Herzkranken. Acta Med Scand. 1920;53:469-486.

Shown for reference and checked against the source above. Confirm against current guidance before acting on it, and use your own clinical judgement.

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