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Corrected QT Interval (Bazett Formula) Calculator

QTc = QT / √RR — heart rate corrected QT interval.

Calculates the heart-rate corrected QT interval (QTc) using Bazett's formula from the measured QT interval and R-R interval (or heart rate).

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

QTc = QT / √(RR in sec); RR = 60/HR

In depth

Calculates the heart-rate corrected QT interval (QTc) using Bazett's formula from the measured QT interval and R-R interval (or heart rate).