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QTc Calculator

Calculate corrected QT interval using the Bazett formula to assess cardiac repolarization

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Educational Use Only: This tool is for educational purposes only. It does not replace clinical judgment or medical advice.

Enter Measurements

QT Interval(ms)

RR Interval(seconds)

seconds

How to measure:

• QT interval: From start of QRS complex to end of T wave
• RR interval: Time between consecutive R waves (in seconds)
• Use lead II or V5 for best measurements

Reference Values:

• Normal: 350-440 ms (men), 350-460 ms (women)

• Borderline: 441-470 ms (men), 461-480 ms (women)

• Prolonged: >470 ms (men), >480 ms (women)

• Short: <350 ms

Clinical Significance:

The QTc (corrected QT) interval represents the duration of ventricular depolarization and repolarization, corrected for heart rate using the Bazett formula.

Prolonged QTc intervals are associated with increased risk of torsades de pointes, a potentially fatal ventricular arrhythmia. Common causes include medications, electrolyte imbalances, and congenital long QT syndrome.

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