How does the Q Tc Calculator work?

Measure QT interval from ECG Then: Apply Bazett formula: QTc = QT / √RR (RR in seconds) Then: Or use other formulas for extreme heart rates.

Can you give an example of how to use the Q Tc Calculator?

Example: Input QT 420 ms, HR 80 (RR 0.75 s) gives a result of QTc ≈ 420/√0.75 ≈ 485 ms (prolonged) (Elevated arrhythmia risk).

Is the Q Tc Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Q Tc Calculator?

Our Q Tc Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Q Tc Calculator

Corrected QT Interval

QT interval (ms)

Heart rate (bpm)

Corrected QT interval accounts for heart rate, predicting arrhythmia risk. QTc >460 ms females, >450 ms males increases torsades risk.

Symbol	Name	Unit	Description
QT	QT value	—	Variable used in the calculation
RR	RR value	—	Variable used in the calculation

Difficulty:beginner

References

›Qtc — Wikipedia

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Q Tc Calculator

Corrected QT Interval

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Corrected QT Interval